How to disassemble the engine on an alpha 110 cc moped

Engine Features

The engine of the Chinese Alpha moped has characteristic features, thanks to which fans of motorcycle technology prefer this particular model.

Engine for Alpha moped

Engine capacity - 72 cc. With the right approach, it can be upgraded to 110 cc. Also, if desired, you can increase the speed by 10 kilometers.

The weak point of the engine is the gearbox, which requires close attention and a delicate approach . When repairing the “heart” of a moped, you need to know how to correctly disassemble and reassemble this part of the motorcycle “organism”.

Alpha is equipped with a powerful engine, the circuit of which is complex. If you can’t figure it out on your own, it is recommended to contact an experienced specialist. The price of repairs is quite affordable.

Causes of malfunction

The Chinese Alpha moped, whose price is affordable, does not cause owners many problems. Interruptions in a moped engine have several causes, and once you understand them, you can quickly fix the breakdown.

Disassembling the moped engine

So, if the engine starts with great difficulty, the muffler “shoots”, and smoke comes out of the chimney, it means that the moped is “capricious” due to problems with the carburetor. In order to solve this problem with the Alpha moped, you need to:

If the Alpha slowly picks up speed, and its engine is not able to develop the declared power, then the reason is the incorrect operation of the moped valves. It can also “get sick” due to gaps and incorrect timing. In order to make the Alpha moped function normally, it is necessary to replace the used valves with new ones.

If the Alpha moped is not able to reach the required speed, despite the roar of the engine and solid revolutions, it is impossible to stop the spinning wheel, and gear shifting occurs intermittently, then the cause of the malfunction is clutch wear.

Moped clutch parts

To eliminate the breakdown, you must perform the following manipulations:

Another cause of moped engine malfunction may be wear on the drive sprockets. If they are very worn, they must be replaced with new ones.

You may encounter the problem of engine overheating. The situation can be corrected after adding oil. If oil leaks, you must urgently contact a professional service .

Alpha moped engine overheating

Engine disassembly

Disassembling the Alpha engine is quite simple. To do this you need:

After performing the necessary manipulations, you need to properly assemble the engine, installing all the parts in place.

A diagram can help you understand the nuances. Also, a lot of useful tips regarding repairing the most important “organ” of the Alpha moped are contained in the training video.

Alfa 72cc moped wiring diagram with tachometer

There is alternating voltage on the white wire, which is immediately sent for rectification and stabilization. Current from the battery is supplied to the main circuits of the scooter.

Brakes To adjust the front brake, a stop is installed on the brake pad disc. Before starting operation, check the tightness of all connections; presence of oil in the gearbox and fuel in the tank; correct adjustment of gear shifting mechanisms, clutch, brakes; tire air pressure; tension of the chain and wheel spokes; operation of lighting and signal devices. If second gear does not engage, then the free end of the cable is small. To do this, you need to disengage the clutch, simultaneously reduce the engine speed and engage second gear. Problem identification is done using a multimeter. Starting the engine Before starting, after a long break in operation, engage first gear and roll the engine back and forth two or three times, squeezing the clutch. To open it, you need to remove the decorative plastic. You should not drive for a long time in first gear, as the engine overheats, quickly wears out and overuses fuel. When lubricating, it is necessary to remove the old grease and wash the parts in kerosene.

Chinese mopeds

Since then it has been ready to launch. It goes directly to the spark plug, where it is converted into a spark. Ignition Circuit Components The ignition system is an important element in the operation of the entire scooter. Front fork 1 - bolt; 2 — upper bridge; 3 - spring; 4 — nylon bushing; 5 — fork frame; 6 — bushing; 7 — internal pipe; 8 — cover; 9 — bearing; 10 — protective washer; 11 - nut; 12 - lock nut. This abbreviation stands for Capacitor Discharge Ignition - ignition from a capacitor discharge.

Repair the camera according to the instructions included with the first aid kit. In this case, the wiring for the Delta moped is supplemented with several elements for connection. Sound signal The purpose of the sound horn is clear to everyone. During operation, the brake pads wear out, and then the brake mechanism cannot be adjusted using the above method.

Voltage is supplied only when the ignition switch is turned on. The remaining positions close the black and white wire from the ignition module to the ground of the scooter. You should not drive for a long time in first gear, as the engine overheats, quickly wears out and overuses fuel. Repair wiring on moped Alpha

Let's start repairing the Chinese miracle of technology

The Alpha 72cc moped is one of the most famous representatives among Chinese motorcycles. This moped is perfect for use both in rural areas and on city roads. A durable iron frame, complete absence of plastic parts, large diameter wheels - simply created for domestic roads, the quality of which is far from European level.

If you ride often, the rather high seating position of the ALPHA moped makes it possible to overcome low obstacles. A big advantage when choosing a moped is its low price, which makes the purchase quite affordable. This would be a good choice for a beginner.

There are models with a side trailer. Practical to use in rural areas. A reliable assistant in the household.

Economical, with an engine capacity of 72 cubic meters and air cooling, the Alpha moped is unpretentious. This is an extremely simple transport and servicing it couldn’t be easier! You simply cannot find a simpler engine, and spare parts cheaper than Alfa’s can only be found in a dream.

Anyone can carry out tuning or repairs on an Alpha moped with their own hands.

Before you start disassembling the motor, you should fix it on the center stand and completely remove all the plastic. All power systems should be turned off - tank, carburetor and fuel filter; The oil should also be drained.

The engine should be removed along with the transmission, and the Alpha moped should be repaired on a flat surface.

You can remove the alpha engine according to the following diagram:

Is this your first time repairing an Alpha moped yourself? No problem! A moped is not a hadron collider; nothing has changed in 50 years of moped construction. For convenience, draw a diagram of the location of the parts so that later you can complete the assembly without any problems.

A smartphone can help, take photos of each step so that later you can reassemble in the reverse order without confusion.

If it is necessary to replace the valves, or if there are gaps in the fit, then they need to be removed:

Alpha moped engine repair

Let's take it slowly, in order:

When the repair of the Alpha moped box is completed, assemble the gearbox using the reverse algorithm.

Recently, on the repair forum, Alf found an article from the manufacturer with recommendations. The article began with the words “Repair of an Alpha moped for many begins almost immediately after purchase.” Alas, this is the bitter truth. If you are choosing between a used Alfa with a mileage of 10 thousand and a new Alfa three times more expensive, then it is better to buy a used one, since many problems will begin in the new one, in time you will not “win” even one season.

There are three types of simple upgrades that can be made on the first day of purchase:

Increase in cylinder volume - replacement from 50 cc. at 125 cc., will add power, which is never enough. To do this, in addition to the cylinder head, you will have to change the pistons and carburetor. You can carry out such maintenance of the Alpha moped yourself. The author of this article saw with his own eyes how a man bought only a 110 cylinder and installed it right next to the store instead of the standard one. Nothing else was changed - neither the carburetor nor the head.

Did the moped go after that? Yes. How long? No. Everything jammed, right down to the connecting rod and crankshaft.

Once you have disassembled the timing belt and CPG, put the parts in separate boxes. Sketch the position of the gears and forks on paper before removal or take a high-quality photograph on your smartphone.

Do not hurry. Think more, do less. Don’t be afraid and don’t be lazy to study the hardware, watch a lot of video tutorials until the structure of the motor is completely clear to you.

Hang panniers, change headlights and mirrors. The Alpha moped is from the series that will respond to any of your concerns with reliability in thousands of your future kilometers. But remember, installing a more powerful light bulb will put a strain on the battery. Install a powerful battery and the generator may not be able to charge it.

I have seen three types of generators on alphas - two-coil, three-coil and 6-coil. At the same time, the motors were completely of the same type and cost the same. The 6-coil battery is capable of charging a full 10 Ah motorcycle battery. The two-coil battery can hardly charge even the standard 3 Ah battery.

To fix the problem you need to:

Another cause of moped engine malfunction may be wear on the drive sprockets. If they are very worn, they must be replaced with new ones. Their cost is simply ridiculous, do this and you may feel like your moped has found a new life!

I don’t mean one drop a day dripping from under the engine, but actual oil leakage, indicating depressurization of the power unit.

In this case, it is necessary to drain the oil, disassemble the engine completely, find a leak (most often the problem is in the seals) and reassemble it taking into account repairs.

This is what an Alpha engine overheating looks like

It is necessary to disassemble the gearbox in order to replace used parts. As we have already mentioned, the Alpha gearbox is one of the weakest and most vulnerable parts.

Gearbox repair in progress

Motor repair is carried out as follows:

To assemble the gas distribution mechanism, pay attention to the following parts:

To prevent the sprocket from jumping off the axle, it should be lubricated with grease. Then the cover is installed, pre-lubricated with sealant. After this procedure, install the starter star and chain guide.

Chinese mopeds

Single platform models

Today's realities are such that you can no longer see domestic models on public roads.

Times are changing, and the weakened banner of freedom from the hands of the domestic “Carpathians” and “Verkhovyna” was picked up by Chinese mopeds of the following series:

Let us state a fact: products from China have become widespread in the domestic motorcycle market.

And other similar models, equipped with everything necessary for travel. These are all Delta “co-platforms” produced by the Chinese manufacturer Chongqing Wonjan motorcycle and the companies that bought a license from it.

For reference: It should be noted that Chinese technology has significantly displaced the products of domestic motorcycle manufacturers on the Russian market. This is noticeable not only in the form of finished products, but also in all kinds of components. For example, the Kovrov Motor Plant abandoned its own production of power units and installed the Lifan engine on its models.

Similarity of design

It is noteworthy that the electrical wiring of the Delta moped is similar to other models, which facilitates maintenance and increases the popularity of the vehicles.

Although seemingly complex at first glance, the electrical connection diagram is quite traditional.

Note! The photo above shows the wiring diagram for a Delta moped that does not have a tachometer on the instrument panel. It is identical for all models of this manufacturer, and differs only in the control of the semi-automatic transmission (Delta Racer model).

The video in this article will provide information regarding maintenance of similar models. For products with an instrument panel containing a tachometer, we publish part of the diagram, which also has differences in the controls. In this case, the wiring for the Delta moped is supplemented with several elements for connection.

The photo shows part of the electrical circuit of the Delta model with a tachometer

If it doesn't start

When the Alpha moped does not start, the muffler fires and black smoke comes out of it, this means that you have a problem with the carburetor. Black smoke says a lot, a lot.

Firstly, since there is smoke, the fuel burns, and the piston throws it into the exhaust. This means the CPG is ok, and most likely the valves too.

Secondly, smoke indicates proper ignition, the candle gives a spark, otherwise smoke could not have formed.

Thirdly, smoke is almost a combustion process, which means the problem is in the carburetor, the fuel mixture is not supplied correctly.

To fix these problems, you need to clean the carburetor and air filter, also make carburetor adjustments and tighten the bolts thoroughly.

If your moped takes a long time to accelerate, it’s as if someone has “castrated” the engine and the power reserve seems to have disappeared – the problem is 100% in the valves, they should be replaced.

After a thousand kilometers, the engine needs to be checked for the first time, subsequent checks should be performed every four thousand kilometers. All checks should be performed only on a cold, already cooled engine.

The moped can be loaded with one hundred and twenty kilograms, while it itself weighs eighty-one kilograms. The Alpha moped is equipped with an air-cooled engine, two brakes: front and rear, four-speed manual transmission, 2 shock absorbers.

Additionally, the Alpha model is often equipped with mudguards on the rear and front wheels. They will help protect the driver and engine from water and dirt.

Alpha has a 4-stroke engine, which must be diagnosed and repaired according to the following parameters:

Now, in conclusion, I would like to give the most useful advice you can find on the Internet. When the engine is completely worn out, sometimes it makes sense to buy the entire engine, in which case you will also receive some spare parts from the original old engine, and, in principle, a new Alpha moped. Engine repair is almost always much more expensive than a new engine. Remember this.

Appearance of Alpha RX

Alpha RX is an updated version of the previous classic moped. The new moped has become more interesting and elegant in appearance. The exterior has a modern look which I liked. The tank has been updated, a two-level seat has been installed - the passenger is now slightly higher than the driver. The passenger's visibility is now better. The wings are now made of plastic, but only the front wing is painted. This already saves the wings from corrosion.

The headlight became larger than that of the classic Alpha, a serious halogen lamp was installed, and the light became brighter. The rear shock absorbers have become more advanced in shape. The motorcycle is also equipped with serious lighting equipment - front and rear lights, turn signals with sound, high and low beams, a signal and a brake light.

Very easy to use. Repair is possible with a minimum set of tools, but you will have to stock up on additional open-end wrenches: 9, 11 and 15.

Alfa moped engine repair

Recommendations for repairing the Alpha engine.

As we all know, any motorcycle wears out and breaks over time, especially if it is not handled correctly. The most important part of the Alpha moped is its engine, which, if handled improperly or repaired or replaced with spare parts, may not work or work incorrectly. To avoid such problems, you need to know how to properly repair the engine of an Alpha moped with your own hands. This is easy to do if you have the necessary experience and knowledge.

Do-it-yourself repair of Alpha moped engines

When the moped does not start, the muffler fires and black smoke comes out of it, this means that you have a problem with the carburetor. To fix these problems, you need to clean the carburetor and air filter, also make carburetor adjustments and tighten the bolts thoroughly.

If your moped takes a long time to accelerate, and the engine does not have enough standard power, the problem is broken valves. The old valves need to be replaced with new ones and the moped will work again.

If the Alpha moped cannot accelerate to the required speed, although it has high speeds, and the engine roars like crazy and shifts gears intermittently, the problem is clutch wear. To repair the clutch you need to do the following: you must remove the engine and the plastic cover from it, then unscrew the clamping bolt and the adjustment mechanism, then tighten the clamping bolt tightly, and start the moped. After all this, you need to drive a little at first speed, about a couple of meters. Also, another cause of engine-related problems is wear of the drive sprockets , in which case you will have to replace them with new ones.

Engine overheating . This problem can be solved very simply - add oil. If suddenly oil leaks from somewhere, you should definitely contact a professional.

Alfa 110 moped wiring diagram

This abbreviation stands for Capacitor Discharge Ignition - ignition from a capacitor discharge. Sprinkle talcum powder on the inside of the tire.

Electrical diagram of Delta 50 mopeds without a tachometer The photo below shows a schematic electrical diagram of the Alfa, Delta moped and other mopeds that do not have a tachometer. Change the oil in the gearbox with a warm engine after the first km, and then regularly after km in the following order: remove the filler and drain plugs; drain the used oil; Screw in the drain plug and fill in approximately cm3 of oil; screw in the filler plug; let the engine run for 3-5 minutes, shift gears alternately. When starting a cold engine, press the float stop 22 fig. Problem identification is done using a multimeter. Place part of one bead of the tire in the recess of the rim, use a spudger and a wrench to push the entire bead of the tire onto the rim and slide it towards the rim flange. Brakes To adjust the front brake, a stop is installed on the brake pad disc. Check the operation of the gear shift mechanisms, clutch, and brakes. Protect the paper element from contact with oil and gasoline. Obe3obPasha Leave a comment Over the past few decades, the domestic moped manufacturer has completely left our market, and Chinese analogues and new models have taken its place. Electrical wiring for the 157QMJ engine (Simplified) or how to start the engine without a moped

Dismantling engines and gearboxes of Alpha mopeds

In order to disassemble the engine you need to do the following:

Remove the screws located in the intake manifold.

Remove all cylinder covers and screws.

Remove the cylinder head.

The gearbox is disassembled to replace parts such as rotors, clutches or cylinders.

In order to disassemble the gearbox you need to do the following:

Remove the retaining ring, then the drive gear is removed.

Unscrew the locking gear screw, then remove the gear shift mechanism itself

Remove the shift fork and shaft, then the crankshaft and drum.

Put everything back to front.

And in conclusion, we would like to say that although the Alfa moped rarely breaks down, it is not worth disassembling and repairing it yourself if you lack knowledge and experience, or you are simply not completely sure that you can handle it, since if you want to save money, you can lose a lot more . Therefore, you should not refuse the services of professionals. But still, if you decide to repair the engine of the Alpha 110 moped yourself, do not forget to use the diagram or training video. And if there is no diagram, then mark the location of the parts on a piece of paper so as not to forget.

Alpha moped engine assembly (part 1)

Alpha moped engine assembly (part 2)

You might be interested in the Alfa 125 cc engine with automatic clutch, tuning

Source

To watch online, click on the video ⤵

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Engine Features

The engine of the Chinese Alpha moped has characteristic features, thanks to which fans of motorcycle technology prefer this particular model.

Engine for Alpha moped

Engine capacity - 72 cc. With the right approach, it can be upgraded to 110 cc. Also, if desired, you can increase the speed by 10 kilometers.

Tools

Generator puller (you can make it yourself)
Variator puller (you can make it yourself)
Kickstart sprocket puller (157QMJ engine only)
Heads for 8, 10, 12, 17 mm
Phillips and flathead screwdriver
Small hammer
Wish

Most Chinese four-stroke scooter engines can be divided into two main types

First type: 139QMB-series engine. This engine is very popular in the CIS countries and is installed on most Chinese four-stroke scooters
Second type: 157QMJ-series engine. This engine has a larger volume than the first and, due to its higher price, is not so popular

Essentially, these two engines are a copy of the ancient Honda GY6 and differ from each other in displacement, kickstarter design, oil pump drive and electric starter drive. In all other respects, these engines are identical.

Typical 139QMB, in fact JL1P139QMB-2

And this is what a typical 157QMJ looks like, in fact LK162QMK

Advantages of the online store of motorcycle parts “MotoArt”

The catalog of the MotoArt store presents high-quality batteries for Alpha 110 and other models of mopeds. A large selection of various types of devices, differing in their capacity, size, technical parameters and price, will allow you to choose the most suitable battery model. The best modifications of rechargeable batteries made in Ukrainian, Chinese and Taiwan are presented to buyers. All units are accompanied by quality certificates and are carefully checked before being sent to the client for manufacturing defects.

Causes of malfunction

Disassembling the moped engine

Moped clutch parts

To eliminate the breakdown, you must perform the following manipulations:

Another cause of moped engine malfunction may be wear on the drive sprockets. If they are very worn, they must be replaced with new ones.

You may encounter the problem of engine overheating. The situation can be corrected after adding oil. If oil leaks, you must urgently contact a professional service .

Alpha moped engine overheating

Engine disassembly

Disassembling the Alpha engine is quite simple. To do this you need:

After performing the necessary manipulations, you need to properly assemble the engine, installing all the parts in place.

A diagram can help you understand the nuances. Also, a lot of useful tips regarding repairing the most important “organ” of the Alpha moped are contained in the training video.

Main malfunctions in the operation of the Delta moped

Often, repair of a Delta moped is limited to replacing rings and piston , rebuilding the gearbox and adjusting the valve clearance.

The four-stroke engine is characterized by certain difficulties in repair, but it has such characteristics as durability, economy, and good power.

It also bears loads quite easily. Debugging the Delta moped clutch is performed if slippage or incomplete engagement of the clutch is observed. When repairing an engine, remember the disassembly procedure. Provided that most elements are worn out a lot, it is easier to buy a new one.

Repair of the Delta moped engine is carried out in the following cases:

First of all, you need to check the presence of gasoline in the tank, the presence of a spark and whether the generator is working. All actions are performed sequentially. After making sure that the cause is not fuel, we check for the presence of a spark. If there is a spark, we check other parts that could lead to engine failure.

If all the reasons that affect the operation of the engine have been eliminated, but you still cannot start, a more in-depth repair is necessary.

Engine repair consists of the following actions:

Disassembling the Delta moped engine, as well as reassembling the Delta moped engine, must be performed in the correct sequence.

In addition, the engine may not start if the carburetor is not functioning normally . Most carburetor problems can be solved by flushing it. After flushing the carburetor, to prevent future problems, it is necessary to check the ratio of oil and gasoline that enters the carburetor.

If the mixture is too rich or too lean, the main components will wear out, so the ratio must be set in accordance with regulatory requirements. Repair of the Delta moped engine is presented in the video. Watching the video will allow you to become more familiar with the repair process.

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Let's get started

So, the battery is ready to charge. Connect the terminals of the charger to the battery. The red terminal is to the positive terminal of the battery, the black (or blue) terminal is to the negative terminal. Don't mix up the polarity!

Most modern chargers automatically set the charge current and charging time. But if it is possible to set the charging current, it is chosen by dividing the nominal capacity of the battery by ten. For example, with a capacity of 4 Ampere-hours, the charge current should be 0.4A. In this case, the charging time will be approximately 10 hours.

You should not charge a motorcycle battery with a car charger if it cannot charge with a current of less than 1A. High charging currents can damage the battery.

Battery care rules

The battery requires proper storage and care. Here are some requirements for proper operation of a scooter battery , so that it will last a long time.

First, do not allow the battery to be discharged to more than half its capacity. In general, the battery should not be allowed to be stored in a discharged state. If you feel that the scooter starter is having difficulty cranking the engine, recharge it as quickly as possible.

The battery must be kept clean, since dirt accumulating on the terminals contributes to the rapid discharge of the battery due to current leakage. Keep contacts clean and free of oxides.

In order to prevent a short circuit at the battery terminals, which can permanently damage the battery, you need to spare no expense in purchasing fusible links, preferably factory-made ones. Homemade fuses, which often fail, can only make the situation worse.

Measure the voltage at the output terminals with the engine running, it should be between 13.5-14.5 Volts. If abnormal, check the scooter's voltage regulator.

If your scooter is equipped with a serviceable battery, check the electrolyte level at least once a month. If the level drops, add distilled water. Plain water causes the battery to fail faster.

You should always remember that equipping a scooter with a radio, additional headlights, and an alarm requires the scooter owner to check the battery charge more often, since all these devices require additional electricity.

Alpha moped repair

The affordable price has made the Chinese 50 cc moped “Alpha” the literal favorite in the demand for “stools”; in the same bunch is its slightly more durable twin brother “Delta”. Economical, with an engine capacity of 72 cc and air cooling, the Alpha moped is unpretentious and easy to maintain. The clear design of the Alpha moped engine allows you to repair or tune the equipment yourself.

Alpha moped engine repair

Before disassembling the engine of the Alpha moped, we fix the scooter with the central stand and free it from the plastic. We disconnect all engine power systems and do not forget to drain the oil.

We remove the engine along with the transmission, and on a flat surface we continue the home repair of the Alpha moped.

It will help to properly dismantle the Alpha moped engine by disassembling it according to the following scheme:

If this is your first time doing a DIY repair on an alpha moped and you need to disassemble it, don’t forget to sketch a diagram of how everything was in place! If the valves need to be replaced, or if there are gaps in the fit, then they need to be removed:

To complete the repair of the Alfa moped engine, after replacing the parts, we begin assembling the engine in the reverse order, putting everything in its place, observing the marks. Don't forget to add fresh oil.

Alfa moped box repair

The gearbox of the Alpha moped sometimes fails and requires constant attention. Repairing a gearbox at home is not particularly difficult for a beginner.

We carefully read the instructions for the alpha moped, do-it-yourself gearbox repair.

Let's take it slowly, in order:

When the repair of the Alpha moped box is completed, assemble the gearbox using the reverse algorithm.

Tuning

For many, Alfa moped repair begins almost immediately after purchase. Thanks to the presence of spare parts and the simplicity of the Alpha moped engine, tuning is common. This could be replacing the not very comfortable original seat, or increasing the engine capacity to 110 cc. Replacing the sprocket from 14 to 15 or even 16 will increase the speed to 10 km/h.

Increase in cylinder volume - replacement from 50 cc. at 70 cc., will add power, which is sometimes lacking. To do this, in addition to the cylinder head, you will have to change the pistons and carburetor. You can carry out such maintenance of the Alpha moped yourself. If you bought an Alpha moped, repairing the gearbox and engine yourself will be a good opportunity for you to study your equipment.

And finally, some useful tips that will make repairing an Alpha moped a more enjoyable experience for you.

Have you disassembled the timing belt and CPG? Place parts in separate boxes. Sketch the position of the gears and forks on paper before removal. If you decide to increase the speed of the Alpha moped using an asterisk, do not forget that the front and rear change at the same time.

Monitor the speed, prevent clutch wear, and change fluids in a timely manner.

Don’t be afraid of repairs, learn the hardware, watch video lessons, and you won’t need the services of a mechanic.

Hang panniers, change headlights and mirrors. The Alpha moped is from the series that will respond to any of your concerns with reliability in thousands of your future kilometers.

Removing the cylinder head of the Alpha moped

When detonation occurs or to replace valves, as well as to clean the combustion chamber from accumulated carbon deposits, it becomes necessary to remove the moped cylinder head . To do this, you will need a set of keys, and, of course, a certain amount of courage. If you are unsure of your abilities, it is better to contact a specialized center.

Let's get started, I guess. First, unscrew the muffler and then remove the carburetor exhaust pipe. Find a 10mm key screw on the back of the round plug and unscrew it. This will allow you to remove the camshaft gear cover. Then, holding the flywheel nut with a 14mm socket wrench, use a 9mm socket wrench to unscrew the three bolts that secure the camshaft gear. Now you can unscrew the valve adjustment windows. For this we need a key for 17.

We remove the gear from the camshaft and unscrew the screw that connects the head to the cylinder. Then, unscrew the 4 chrome caps and carefully, so as not to damage the gasket, remove the top cover from the cylinder head. Now you can remove the cylinder head from the studs. Next, we visually assess the condition of the compression gasket and rubber sealing rings of the oil channel. If wear or damage is visible, these parts must be replaced.

Next, you need to remove the round rubber cap. To do this, unscrew the chain guide mounting axis using a 10mm wrench. Unscrew the screw that connects the cylinder to the crankcase and remove the cylinder from the studs. We evaluate the condition of the working surface of the cylinder and piston. If necessary, remove carbon deposits with a wooden scraper wrapped in a clean rag soaked in gasoline or kerosene.

For the same purposes, you can use special cleaners. Inspect the camshaft lobes for wear. They may need to be replaced along with the camshaft. Now all that remains is to install the scooter's cylinder head and carefully install all the parts in place. The main thing is that you don’t have any extra spare parts left.

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Consequences of untimely replacement

If you don't change your air filter, at best its performance will deteriorate over time. The moped will lose power and stop idling. Also, dust getting into the carburetor will clog all the channels, which will lead to unstable operation. The worst case scenario may be that dirt gets into the engine itself. Large particles will leave deep scratches on the cylinder bore and on the piston. The valve assembly may fail. Accordingly, a major overhaul of the engine will be required, so you should not neglect replacing the air filter. The consequences can be dire.

The frequency of replacement depends on the level of road pollution in the area. The cleaning system should be carefully inspected periodically.

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