Which engine is suitable for a Honda Dio?

The Japanese-made Honda Dio 27 scooter has gained wide popularity around the world, including in Russia. The progenitor of the modification in question was released back in the late eighties of the last century. Stylish design and excellent driving performance are the main reasons for the popularity of this moped. At the same time, a driver’s license is not required to operate the equipment, since the volume of the power unit does not exceed fifty “cubes”. Over more than two and a half decades of production, the scooter was constantly improved, equipped with new lighting elements, improved suspension and upgraded brakes.

Paul

Hello, I’ll leave my opinion on what my Honda Dio scooter is, about which I found only positive reviews. And my review is also positive, I’ll even say more, I think this model is the best among Japanese small-capacity scooters. So, as a frequent user of vehicles, I needed a scooter with low fuel consumption, and friends advised me to take the Honda Dio AF 34. Its price was low, so I bought it used, but in excellent condition. I really liked the first days of use, because the scooter was maneuverable, it didn’t skid, and the maximum speed was about 60 km per hour. During the first year there were no repairs, for which I give it a huge plus. The only repair was a broken camera. Driving around the city is just a pleasure, because not a single traffic jam is a hindrance for a scooter.

Honda Dio AF 18: characteristics

Below are the main technical characteristics of the Japanese mokika:

• two-stroke power unit - AF18E with a displacement of forty-nine cubic centimeters;
• number of cylinders – one;
• cooling – forced air type;
• power indicator - six and a half horsepower at 6,500 rpm in sixty seconds;
• turnover – 0.74 kg/m;
• compression ratio – 7.3;
• oil/fuel tank capacity – 0.8/4.8 liters;
• tires – 3.00/10;
• maximum speed – sixty kilometers per hour;
• main base - one meter thirteen centimeters;
• length/width/height – 1.6/0.49/0.7 meters;
• ground clearance is ten centimeters;
• total weight - sixty-three kilograms.

In addition, the Honda scooter is equipped with a CVT transmission, electric ignition, telescopic front and pendulum rear suspension, and drum brakes.

Specifications

Features and device

According to all the main parameters, Honda Dio AF 18 scooters are reliable equipment that can travel many thousands of kilometers without repair. The moped's power plant is unpretentious, is adapted to not the highest octane fuel, and has a successful design. The high arrangement of air intakes and filter elements provides additional protection of internal mechanisms from dust and water.

The scooter in question is considered a single-seater, but it is capable of transporting one more passenger. The maximum speed limit is sixty kilometers per hour. This figure can be easily increased by boring the variator or replacing the switch with a version without a controller. The remaining mechanisms can easily withstand up to 80 km/h. The Honda Dio AF 18 carburetor is quite economical, consuming about two liters of fuel per hundred kilometers. At the same time, the average oil consumption is eight hundred grams per thousand mileage.

Technical characteristics and operating features of the Honda Dio scooter

As you can see, this scooter model is ideal for the Russian consumer. Because it has decent quality and a reasonable price. Well, everyone has drawbacks, even the most expensive models.

The second generation scooters - Honda Super Dio (AF-27) - began to be produced in 1990. They differed little from the previous model, except in design. Even the AF18E engine remained almost unchanged.

Three main variants of the Super Dio were produced: the basic AF-27 model with drum brakes and an AF18E engine, the AF-28 SR model with a front disc brake and an uprated AF18E engine, and the AF-28 ZX model - all the same, plus instead of a trunk she had a spoiler with a brake light.

Honda scooters of the Super Dio series continued to be produced until 1999. At a certain period, this design was produced under the name Dio Fit, with a new design of plastic body kit and headlights.

Specifications

Engine:

Engine type – AF18E, displacement 49 cc. see Number of cylinders – 1. Number of strokes – 2. Cooling system – forced air cooling. Maximum engine power – 6.8 hp. (7.0 hp for AF-28) at 7000 rpm. Torque – 0.73 kg*m / 6000 rpm. Compression ratio – 7.3. Transmission – variator. Ignition - electric starter. The tire size of the front and rear wheels is 3.00-10. Oil tank volume – 1.2 l. Gas tank volume – 5.0 l. Maximum speed – 60 km/h (electronically limited on AF-28). Chassis:

The front wheel suspension type is telescopic.
The rear wheel suspension type is pendulum. Front wheel brake type – drum (AF-27), disc (AF-28 SR/ZX). The rear wheel brake type is drum. Size and weight:
Base – 1145 mm. Length – 1640 mm. Seat height – 700 mm. Ground clearance – 100 mm. Total weight – 66 kg.

Honda dio shock absorber dimensions

Honda began producing the Dio scooter back in 1988.
The first Honda Dio 18 scooters were produced in two versions: with drum brakes and with disc brakes (Honda Dio 18SR). This model was successfully assembled until 1992, after which the production of this model was stopped! Therefore, for those in the know, proposals in newspapers for the sale of Honda Dio af 18, 98 or 95 years of production make people smile - this is simply impossible, they were no longer produced. Of course, in most cases the condition of the scooter is really excellent - it is very easy to bring the Honda Dio to perfect condition literally in a day. This is what allows dishonest sellers to lie about the year of manufacture. Technical characteristics of the scooter Honda Dio AF18.

Engine - 49 cc. see Number of cylinders - 1. Number of strokes - 2. Gas distribution systems - petal. Cooling system - forced cooling. Maximum engine power is 5.5 liters. With. Compression ratio - 7.3 Transmission - variator Tire size of the front and rear wheels - 3.00-10. Chassis: Front wheel suspension type - telescopic. Rear wheel suspension type: pendulum. The front wheel brake type is drum. Rear wheel brake type: drum. Size and weight: Base - 1170 mm. Length - 1655 mm. Saddle height: 725 mm. Ground clearance - 100 mm. Dry weight - 62 kg. Gas tank volume - 4.8 liters.

This model is equipped with a modern four-stroke water-cooled engine, which ensures stable operation in various driving modes and weather conditions. The scooter's stylish design and comfortable seating position during travel have attracted the attention of many enthusiasts. Despite the small engine capacity, the scooter can be easily tuned, allowing you to increase the cruising speed of the moped to 80 km/h. The model is ideal for lovers of country trips, as well as those who love safe driving with comfort.

Technical characteristics of Honda Dio AF 56

Length: 1710 mm. Height: 1010 mm. Base: 1190 mm. Engine capacity: 49 cm3. Bore and stroke: 38.0 x 44.0 mm. Engine stroke: four-stroke, single-cylinder Cooling type: liquid Maximum power: 5.0 hp at 8000 rpm Torque: 0.47 kgm at 7000 rpm. Gas tank volume: 5.0 l. Engine oil volume: — Fuel consumption: 1.33 l./100 km. (at 30 km.h.) Transmission type: CVT Brake type: all drum Weight: 76 kg. Front wheel size: 90/90-10 Rear wheel size: 90/90-10

Well, the most famous Scooter Honda Dio 34/35 ZX

Length, mm. 1675 Width, mm. 630 Total height, mm. 995 Base, mm. 1145 Ground clearance, mm. 105 Seat height, mm. 700 Total weight, kg. 70 Maximum speed, km/h. 60* Engine type. AF34E Number of cylinders. 1 Number of cycles. 2 Working volume, cubic cm. 49 Compression ratio. 40.0吣.3 Power, hp/(rpm). 7.1 Torque, Nm/(rpm) 7.2 / 6500 Oil tank volume, l. 1.2 Fuel tank volume, l. 5.0 Front wheel size. 3.00-10 42J Rear wheel size. 3.00-10 42J Front brake. Disc rear brake. Drum *Limited by electronics

AF-27 Super Dio

The Honda Dio 27, the photo of which is posted on the page, began to be mass-produced following the outdated AF-18 and based on it. Strictly speaking, the AF-27 model was a deep restyling of the previous scooter, maintaining the design and all engine characteristics. The AF-18E engine was not upgraded. The engine as a whole fully met the requirements of the new “twenty-seventh” model in terms of power and other parameters.

The main difference between the Honda Dio 27 and the previous model was its increased dimensions. Among the new developments on the scooter, a small trunk appeared under the steering wheel, as well as a redesigned instrument panel, it was significantly expanded and several indicator lights were added.

During the production of the Honda Dio 27, three additional modifications of the moped were created, which were subsequently produced in parallel with the basic version:

• AF-27 SR - with front disc brake, rear drum brake and a boosted engine without changing the displacement, but with increased power.
• AF-27 ZX is a modification with sporty features, with a larger diameter front disc brake, a rear spoiler with an integrated brake light and a new muffler.
• AF-27 XR Baja is a modification with pronounced sportiness and features of an enduro style, a disc front brake, a handlebar bar from a Honda XR250 Baja motorcycle and accompanying optics, an instrument panel and wind protection for hands.

Start of production

The Honda Dio 27 model is a representative of the second generation of Dio series scooters and the main basic version for subsequent modifications. However, before it, for four years, from 1988 to 1992, AF-18/25 mopeds were produced, which became the beginning of the entire project to create a compact means of transportation in the cramped conditions of a metropolis. And although the goal of the designers of the Honda concern was an economical scooter for the city, it later turned out that it is quite possible to travel on it, ride long distances both on the highway and on country roads.

The first Honda Dio 18 scooter rolled off the assembly line in January 1988. The model immediately became popular, and it was well deserved, since the slightly futuristic design combined with good driving performance attracted buyers. The moped looked modern, the layout was convenient, and the engine never let down. Demand turned out to be high, and the manufacturer had to increase production of the debutant. European dealers began to order large quantities of Dio-18, and the scooters were sent straight from the assembly line to Asia, and from there to Western Europe.

At first, there were even some difficulties with exports, since the Japanese market also needed economical mopeds for everyday use. We had to reorient production to consumers in the Land of the Rising Sun, and with the increase in production of the model, we began to export to European countries. After placing part of the production in Taiwan, the production of mopeds increased sharply, and their shortage gradually disappeared.

How to increase the speed of Honda Dio with minimal investment? Budget scooter tuning

In this case, the increase in speed will not be significant, however, these actions can be dispensed with if you want the scooter to travel at a speed of 60–65 km/h. We configure everything we have. First, we clean the purge channels and exhaust from carbon deposits. This can be done using lye. It is also called caustic soda or caustic soda. Sold in hardware stores, it is very cheap - up to 20 rubles. It is best to clean with rubber gloves, otherwise you will get a chemical burn. After cleaning, the engine runs much easier. It is worth adjusting the transmission, especially if you bought the scooter second-hand. These often use outdated components, so buy a set of springs and weights in advance. For a sharp start and quick acceleration, stiff springs are installed, but at low speeds the scooter will behave unpredictably. Weights are needed to adjust the variator. To select them at the required weight, it is necessary to achieve full extension of the belt to a large radius. The lighter the load, the higher the engine speed and vice versa. If you are underweight, you will not be able to accelerate to maximum speed. All these actions will allow your scooter to accelerate to 60-65 km/h. If this speed is not enough, the next part is for you.

What else can be improved?

You can also improve the Honda Dio AF 18 scooter by improving the piston group. First you need to check the compression, which should be between eight and ten atmospheres. If this indicator is not met, you will have to replace the rings or the CPG completely. In the first option, it is advisable to buy high-quality elements.

The process of polishing the cylinder head and the top of the piston will be useful. Getting rid of carbon deposits will increase the power of the moped. When performing this manipulation, you should remember that excessive force can lead to depressurization of the unit. New weights with greater weight can be installed on the scooter's variator. Before installation, it is advisable to run a grinding machine over the weight sockets, and then lubricate them with graphite lubricant (a thin layer).

Qualitative indicators

The main technical characteristics of the Honda Dio are presented using the example of the AF 27 model:

The entire range of Dio scooters has almost the same load capacity, speed, starting, two-stroke engine and suspension. Brakes may vary - some models have disc brakes on 1 or 2 wheels.

The Honda Dio scooter is undoubtedly endowed with considerable benefits and amenities that come in handy, especially for newly converted scooter riders. The main advantages of this vehicle include:

• speed allows you to be universal for any road;
• quite rigid frame;
• light weight, handling and excellent dynamics save the rider from unforeseen surprises;
• wear-resistant engine;
• ratio of quality and cost;
• perfect plastic, perfectly fitted at the joints;
• there is a 2nd passenger seat;
• dimensions;
• convenient trunk hidden under the seat;
• luggage hook;
• pocket immediately under the steering wheel;
• trendy design and streamlined shapes;

Photo of Honda Dio AF 34CESTA

More serious representatives, such as Dio AF 34 and 35 ZX, have the capabilities to participate in racing, and the memorable appearance will not leave any true connoisseur of motorcycle technology indifferent. Models are found in restyling, in ABS modifications, which adds extra gas shock absorbers, crystal optics, a powerful engine and alloy wheels. Some are equipped with front baskets. The AF 35 ZX model is amazingly good - this white beauty is simply mesmerizing during sharp starting jerks from traffic lights.

Any thing in use by humanity is, as a rule, imperfect. Honda Dio scooters also have some disadvantages:

• due to high demand, difficulty in purchasing;
• not suitable for winter trips;
• rather expensive service station;
• low ground clearance (between the road and the frame);
• fans of scooter racing are not satisfied with the speed offered;

Engine

The Honda Dio 27 motor is a reliable, trouble-free unit, thanks to which the moped has become so popular and in demand all over the world. The miniature engine does not require any maintenance and for stable operation requires only high-quality fuel mixed in the correct proportion of gasoline and oil.

• brand – AF34E;
• number of cycles – 2;
• cooling – natural atmospheric;
• cylinder displacement – ​​49.9 cubic cm;
• piston stroke – 39.3 mm;
• cylinder diameter – 40 mm;
• starting - electric starter or kickstarter;
• maximum power – 7.0 l. With. at 6500 rpm;
• transmission – three-speed CVT gearbox, with a switch on the steering wheel.

More advanced tuning

If such indicators are not enough and you want your Honda dio to go much faster and behave much more playfully for a minimal investment, then you need to treat tuning more carefully and modernize many elements of the scooter itself.

Piston group tuning

The engineers who worked on the Honda Dio made it so that the dimensions of the crankcase would allow replacing the standard cylinder with a 39 mm piston and installing a unit with a 47 mm one. If you carry out this operation and select a suitable piston and cylinder (the same Athena is ideal), then the engine volume will increase to 74 cm cubic. It's worth noting that the replacement engine is most likely made of aluminum, which means there's no need to go crazy with different cooling systems. The engine, although larger, produces more power and increases speed, does not require cooling.

Air filter tuning

The standard filter was not made and installed very well. The fact is that it gets dirty too often, which is why it needs to be constantly cleaned. In addition, it is installed in such a way that it is very difficult to get to. It is also not able to pass a sufficient amount of air when installing a new piston. Therefore it needs to be replaced.

You can install a regular car filter of small size. But you need to install it in the trunk. The scooter has a fairly sealed luggage compartment, which is why the filter simply does not have enough air. Therefore, you need to make a small and not entirely noticeable air intake. But you also shouldn’t forget that a lot of dust gets into it, so it’s worth making a coarse filter for the air intake.

To connect the filter and carburetor, you need to select the desired hose and simply fasten it tightly. But it's not that simple. Finding a suitable diameter is not difficult, but finding a hose that will not bend and create air obstructions is very difficult. You could choose a corrugated hose that does not bend when driving, but it creates a strong turbulence that blocks the air flow and thereby air entering the carburetor itself. To improve the performance of the engine and filter, you need to find a hose from the cooling system of the VAZ-2110. When the suspension oscillates, it does not bend and does not create any turbulence.

If everything is done correctly and a good filter is installed, the scooter will gain speed much faster, there will be enough air for the piston to operate, and you will not have to clean the new filter often. In addition, the noise from the filter is almost inaudible. The speed will increase by approximately 30-40%.

Muffler tuning

If you started tuning a Honda Dio and changed the piston performance, then you definitely need to change the muffler. The standard one is simply not able to cope with the air flow that is formed after upgrading or replacing the engine. In addition, the speed with such a muffler will not increase much. The scooter needs to replace the exhaust pipe! The most suitable model would be from Giannelli, but they have closed their production. But if you come across just such a model, then take it. It is worth noting that when installing this exhaust pipe, you need to carefully tune the engine and not over-lean the mixture. But if such an exhaust pipe was not found for the scooter, then Tecnigas is quite suitable. This option is something worse and louder, but also quite good.

Transmission tuning

Tuning a scooter will not be complete without altering the transmission. The fact is that the manufacturers did not take too much care in cooling the gearbox overheating, which can lead to rapid wear of the transmission itself. You can make a simple cooling system that will direct air flow to the transmission and to the gearbox itself. If you have good engineering skills, this is quite easy to do. Speed ​​will of course play a key role in cooling efficiency, but this does not mean that you need to drive too fast, take care of your life.

Tuning is an opportunity to increase the power of a motorcycle and give it an original appearance that emphasizes the individuality of the owner. On our website you can choose various spare parts for tuning mopeds and scooters:

• variators;
• sports mufflers;
• cylinder-piston group (enlarged);
• switches.

Repair instructions for Honda Dio

Tips for repairing Honda Dio are available to any motorcycle enthusiast. In particular, we will talk about servicing the vital parts of an iron car: engine, carburetor and transmission.

The carburetor is a sensitive and important part of the scooter. The slightest breakdown will stop the operation of the entire machine. Owners are often afraid to touch carburetors because they are not confident that they can assemble them correctly. However, everything is not as scary as it seems at first glance. Honda Dio is recognized by experts as the most convenient and suitable representative for disassembling and cleaning the carburetor. The fact that it is not covered with plastic, its location above the transmission and the ease of setting up the mechanism speak in its favor.

• the adjustment process is carried out on a well-warmed engine;
• if there is any doubt about a blockage, clean the carburetor and rinse thoroughly;

The setting itself involves adjustment:

1. idle move;
2. quality of the mixture (by moving the needle and using;
3. specialized screw;
4. amount of fuel in the float chamber;

Honda Dio engine repair

The engine is the heart of the scooter. Principles for eliminating basic breakdowns:

1. piston wear and increasing fuel and lubricant consumption are caused by low compression (below 8.0 kg/cm3 with a norm of 9.5-10.5); it is necessary to bore or change the cylinder-piston group;
2. a clear and loud knocking sound at the bottom of the cylinder, often when throttling, indicates wear of the piston skirt—replace the piston or the entire c/p group;
3. the engine stalls, losing power, usually when it is clogged - cleaning is required: burn it, or cut it, clean off the carbon deposits and weld again; the exhaust window can be cleaned;
4. does not start, does not work well, does not hold idle speed if the seals are broken (fuel leaks form there) of the cylinder, crankcase, head gasket, crankshaft seals are worn out - replace the seals and gaskets;

The transmission also becomes unusable, and, sooner or later, it is replaced. The process of replacing the variator is not particularly difficult. The main thing is to choose the right belt - this will allow you to keep its settings unchanged. For example, a very long belt will begin to slip, and a wide one will reduce the range of gear ratios and will not reach the maximum width of the cones.

Technical characteristics and operating features of the Honda Dio scooter

As you can see, this scooter model is ideal for the Russian consumer. Because it has decent quality and a reasonable price. Well, everyone has drawbacks, even the most expensive models.

The story of the resounding success of Honda Dio

For the query “Honda Dio” in almost any search engine you can get 1.5 million answers, but almost nowhere you can find out the detailed history of the creation of these mopeds, only dry numbers of years of production and their new modifications. Honda itself is not very remarkable; the secret of its success is in the engine. If you take the engine away, then the notorious Dio has little to boast of. The engine is just about the engine...

Protection

In 1993, the moped began to be equipped with an anti-theft system, which was a special curtain covering the ignition switch. The number of abductions decreased sharply, since it was impossible to open the protection without a special tool. The curtain opened after entering an electronic digital code on the dashboard, which only the owner of the scooter knew. The effectiveness of such an anti-theft device was obvious. Its only drawback was that if the electronic code was forgotten, it was not possible to open the ignition switch; it was necessary to call the electronics technicians and turn off the entire system.

Advantages

Despite the small engine capacity, the technology in question remains popular for a long time. Honda Dio AF18 scooters are optimal for traveling on asphalt. In urban conditions, this is an indispensable option for lovers of light motorcycles not intended for racing and high loads.

The front telescopic suspension unit has some rigidity and adjustable travel, which allows for good maneuvering on the roads. The wheels grip the surface well, allowing you to take almost any turns perfectly. Shock absorbers are very sensitive to potholes and uneven roads. Nevertheless, even if the elements fail, they can be replaced without problems in most specialized workshops. On dirt roads you will have to get used to the shaking, but at low speed it is quite possible to overcome such sections.

Running elements

The Japanese scooter "Honda Dio 27" is equipped with smooth gear shifting, starts moving without jerking, picks up speed dynamically and has soft shock absorption. It carries not only the driver, but also the passenger without any problems. Thanks to these characteristics, the scope of use of the moped is significantly expanded - from trips to the store to use in the delivery of flowers or fast food.

Chassis parameters:

• front suspension unit - telescopic fork and side shock absorber with lever;
• a similar rear block is of the articulated-pendulum type with a spring shock absorber;
• brakes (front/rear) – disc with caliper/drum unit;
• wheels – 3.00/10 inches.

What is the carburetor of a Chinese scooter and its capabilities, disadvantages, tuning

The carburetor circuit of a Chinese scooter is, in principle, standard and suitable for both 2t and 4t engines. The design of the carburetor allows certain actions to be taken to improve its performance, however, if the engine is two-stroke, the efforts will not make sense.

The simplest approach is to replace the carburetor with a more advanced one, for example, with an accelerator motor, if you have a fairly old version without it. Most often, simple tuning is limited to replacing the main fuel jet, this is especially true for engines with low power. Replacing the nozzle helps to increase the fuel channel and, due to this, add a little power to the engine.

Quite often, more serious tuning involves the use of a 150 cc scooter carburetor. Interesting models with a diffuser diameter of 17.5 mm. It is great for 70cc piston. Less often you come across a large diameter of 19-24 mm, it is just ideal for a bored 150 cc piston engine. However, the diameter must be selected correctly, otherwise the motor will begin to choke.

Equipment and safety

The modification in question is equipped with drum brakes; on more modern models, the front unit is of a disc type. Despite its effectiveness, it requires more careful maintenance since it is open and susceptible to contamination.

The Honda scooter is equipped with a spacious trunk located under the saddle of the unit. There are no pockets for tools and other small items in the front part. Due to its reliability, ease of maintenance and cost, this moped has remained popular for almost two decades. With proper care and timely replacement of consumables, it will serve the owner for a long time, without losing its main indicators.

Experiments during production

On the first model, during production, we tested different types of brakes. Initially, drum mechanisms were installed on the moped, then the wheels were equipped with disc brakes, which looked more modern. At the same time, a version of Dio-SP was created, which was produced in small batches. These mopeds differed from the basic AF-18 in their defiantly bright combined colors and a fundamentally different design of the instrument panel. Production of the first generation model was discontinued in 1992.

Tuning Honda Tact, Dio scooter with AF24E engine

In this article I will tell you how, for a very reasonable amount of money, you can significantly increase the dynamics and power of a Honda Tact or Dio scooter equipped with an AF24E engine. By the way, tuning is a thing that knows no boundaries, rules and limits on the path to perfection. But the purpose of this article will not be to discuss tuning as such, but to talk about how you can significantly improve engine parameters while spending a minimum of effort and money.

For those who don't know, two-stroke engines, by their nature, are very responsive to increasing engine displacement. Unlike four-stroke engines. In four-stroke engines, engine power largely depends on the design and configuration of the cylinder head, but in two-stroke engines, the cylinder head does not have such a significant effect on engine power. Therefore, any, even small, increase in the volume of a two-stroke engine gives a significant increase in power over the entire engine speed range.

So, we go to the store and buy a piston with a volume of 72 cubic centimeters (47mm). I bought myself this one, it costs 1,300 rubles, but taking into account the discount, it cost me only 1,100 rubles.

For comparison: on the right is a piston (not original, the engine has already been removed from the farm, and quite “successfully”...) with a volume of 58 cubic centimeters (42mm), and on the left is a piston, which we will install with a volume of 72 cubic centimeters (47mm).

A few words about the piston: its manufacturer is Chinese a la noname, so you shouldn’t expect high service life and workmanship from it. There is no gasket for the cylinder head and cylinder in the box and they have to be purchased separately. There is no protective coating on the piston, and this is not good, although for a two-stroke engine the lack of a protective coating on the piston is not a critical point, but still...

The cylinder has a five-channel purge with a well-developed network of purge windows, which has a very positive effect on increasing power, especially in the high-speed zone.

The piston rings have clearly readable markings and their appearance inspires confidence. At the very least, it is difficult to make any complaints about the geometry and cleanliness of processing.

Now about the sad thing: it is not possible to install this piston engine without disassembling the engine and modifying the crankcase... But tuning, as we know, “requires sacrifices,” so if we want to significantly increase the power and dynamics of the scooter, then like it or not, we will have to disassemble the engine a little file the tides marked by arrows in the crank chamber.

The tides can be cut with a file, or they can be cut with a well-sharpened chisel. I cut it down with a chisel.

The second unpleasant point, and maybe not so much, is that the standard pump of the engine lubrication system will not be able to provide the proper level of lubrication for a piston of increased volume, and therefore with a larger working area. Therefore, when operating a scooter with a larger piston engine, you should add a little oil to the fuel tank of the scooter. In principle, this is where all the troubles associated with this piston engine end.

After modifying the crankcase, you should thoroughly wash all engine parts from any remaining metal shavings and abrasives, reassemble the engine in reverse order, and only then can you begin installation.

This piston is installed according to the same principles as any other piston for a two-stroke engine. The only difference, or most likely difficulty, is that there are no marks on the bottom of the piston that would allow the piston to be correctly positioned in the cylinder.

Therefore, when installing the piston on the crankshaft connecting rod, orient the piston so that the piston ring lock pins point strictly at the purge port located in the diametrically opposite direction from the exhaust port.

Now about the main thing

After installing a 72CC piston and proper running-in, the scooter significantly increases dynamics and power. Believe it or not, but with skillful handling of the throttle and at the same time playing along with the body, the scooter easily stands on the rear wheel while leaving Chinese garbage dumps of various kinds far behind...

Honda Dio AF 18: tuning

Since this modification is a budget option, it makes no sense to spend a lot of money on its modernization. However, inexpensive improvements can be made that will improve speed and some other indicators. First of all, you need to check the standard settings. After cleaning the exhaust pipe, air filter, adjusting the carburetor and variator, the owner will definitely be pleased with the results obtained.

To make the scooter more playful, you should remove the speed limiter. Buying a new filter, adjusting the jet for it and boring the accompanying elements makes it possible to slightly increase the speed parameters. You can additionally invigorate the two-wheeled “horse” by cleaning the exhaust pipe, heating it with a gas cutter, or sawing it in half, cleaning it and reconnecting it by welding.