If you were lucky enough to buy a 50cc scooter, you've probably already thought about how to get the most out of it. For almost every scooter rider, top speed remains a priority, and most models cannot boast of sufficient power. Considering the widespread availability of models with a capacity of 50 cubic meters and their limit of 60 km/h, the question of how to increase the speed of a scooter is quite reasonable. Naturally, there is a solution to this problem.
As practice shows, minor tuning can increase the top speed by 10-15, and in some cases, by 20 km/h. The main thing is to understand which motorcycle settings will be as convenient and simple as possible for independent implementation. You need to figure out how to increase the power of a 50cc scooter and get a real increase in speed, without unnecessary problems.
How to increase the power and speed of a moped
Many scooter owners, after a few months of riding, think about the question “How to increase the speed of the scooter?”
And no wonder! After all, the notorious 50 “cubes” are often not enough, and it is not possible to quickly raise money for new, more powerful equipment. That is why various tricks are used to increase the power of the moped, as well as its speed from the usual 60 km/h to 80 and above.
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.
Procedure
There are several effective ways to increase moped performance such as speed and power. The most popular of them should be described:
- Using a screwdriver, unscrew the side and rear plastic from the moped.
Under them you will find a belt responsible for transmitting speed to the rear wheel and both sprockets. Above this belt you will see a small metal washer (speed controller) that limits the belt to a larger radius.
You need to knock this puck down with a hammer, and then try to pick up speed. If your moped has an engine capacity of up to 75 cc. see I was able to accelerate to 70–75 km/h, which means you succeeded.
[sc:ads3] Unscrew the fastening of the transmission mechanism and remove it from the moped. Then, without sudden movements, try to remove the belt, having previously stocked up on a new larger rear sprocket (the new spare part can increase the torque). Put the belt back on and try to pick up speed.
With proper modification of the scooter, you can increase the maximum speed of the vehicle to 120–140 km/h, however, for this you will need to attach a new washer, which will protect you and will not create difficulties during the technical inspection.
Fastening the washer above the belt in different positions will allow you to adjust the maximum speed of the moped.
The higher the puck is, the higher the scooter's speed will be. Try to empirically find the position of the washer at which the max. the speed would be 95–100 km/h.
- After all this is done, when you reconnect the gearing, put the plastic back in place and try to get up to speed, you will find that the top speed will be higher and the acceleration will be smooth and slow.
The only disadvantage of such actions will be a natural decrease in traction, as a result of which you will not be able to normally drive up hills with an inclination angle of 20 degrees or higher.
Running in a moped with an updated engine
When the moped is assembled with a new motor configuration and run in gentle modes, try to reach maximum speed in deserted conditions. It may turn out that the chassis and brakes can no longer cope with the power of the engine. The spokes of the rear wheel are curled by torque, and in order to brake the moped you will have to release the brake parachute. While driving, the silent blocks of the shock absorbers fall out and wobbling begins. This means that next on the replacement list will be shock absorbers, a motorcycle front fork with a wheel and a disc brake system.
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Other options
In addition to the above method, you can increase the performance of a moped such as its power and speed using other tricks. For example, you can increase the power of your scooter by replacing the muffler, replacing it with a compatible resonant pipe, and tuning the transmission.
You can also choose a sports variator for your scooter and install a reinforced belt .
If you don't know how to further increase the power of your moped, try replacing the standard exhaust pipe with a sports one. With its help, you will increase the power of the scooter by up to 15%, increasing the maximum speed. Finally, replace regular brakes with disc brakes, standard brake pads with sports brake pads, and select brake hoses with reinforcement.
After all the work involved in trying to increase the speed and power of the scooter, do not forget about your safety and the safety of other road users. If you doubt the correctness of your modifications to the moped, contact the service, where they will give you practical advice or carry out a set of improvements yourself. Remember that your life may depend on the quality of work to increase the power and speed of equipment.
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Short description
When buying an imported engine in a specialized store, you need to remember that large foreign manufacturers produce the main percentage of units with a small power reserve, as well as fixed limiters. The final cost of products may differ significantly from each other. This approach allows manufacturers to achieve the optimal indicator established by environmental legislation.
The best option for fishermen is:
- purchasing an inexpensive imported motor;
- removing all restrictions;
- increasing the power of a boat motor without significant financial costs.
Experienced fishermen and hunters have long developed many interesting options, thanks to which you can achieve the desired engine performance without additional injections of money. The standard power increase scheme looks like this:
- It is necessary to get rid of unnecessary ballast and things.
- Continuously monitor the condition of the propeller in order to promptly clean it from possible contamination.
- When choosing high-quality fuel and oil, there is no need to save money, since the performance of the equipment directly depends on this.
- Experts recommend monitoring the pitch of the propeller. Increasing or decreasing indicators depends on the specific situation.
- Before full operation, the engine must be run in and adjusted.
Low-power outboard motors can be improved by an experienced specialist who is able to completely overhaul the unit and equip it with higher-quality parts.
How to increase the speed of a scooter?
Most scooter models are available with a capacity of up to 50cc. cm, so the maximum speed is often limited to 60 km per hour, which is quite a low figure for many scooter riders. And soon after purchasing new equipment, you immediately think about the possibility of tuning your scooter and increasing the speed of the scooter to the highest possible level. Practice shows that the maximum that can be added is plus 20 km/h, that is, accelerating an ordinary scooter to 80 km/h is quite possible. Below are the main ways to tune a scooter and increase its speed to maximum.
CVT tuning
This is the most effective and simplest method; the variator has a number of design features, but it also has a special limiter in the form of a washer. The first step is to get to the variator; in some models you will have to remove the side plastic. The CVT has a belt that transfers power from the engine to the rear wheel. As a standard, a special small washer should be located above the belt; this is called a speed controller. Its task is to limit the effect of the radius of the belt, which is formed during movement. Accordingly, all tuning consists of removing this washer; in frequent cases, it is enough to simply knock it off. Afterwards, test the maximum speed of the scooter; if you did everything correctly, scooters up to 50cc should receive an increase of +15 km/h.
Also, tuning the CVT is possible in the process of completely replacing it with a tuned version, as a rule, this is a sports CVT. If desired, you can improve the speed indicator by purchasing a more efficient variator belt. In this case, the speed will be significantly increased, but a slight smoothness will be felt. In other cases, it is enough to slightly increase the speed by replacing the variator rollers, since they are classified by weight. Setting the rollers to speed will increase up to +10 km/h.
Valve petals
This option also allows you to increase the power of the outboard motor. At the first stage, the carburetor shutter is inspected in order to detect the throttle valve limiter. If the hole opens completely at maximum thrust, then there are no obstacles. But when the motor is not functioning at full capacity, you need to find out what exactly is stopping it.
The valve petals are located under the carburetor. These are peculiar hard plates that are bent inward. In all two-chamber engines they are mounted in close proximity to the main cylinder. If the petals are slightly pressed inward, they need to be gently squeezed out (without extra effort). A slight bend will ensure optimal fuel flow. But in the end, fuel consumption will increase, which will entail additional expenses.
Tuning and adjusting the carburetor on a scooter
This part is one of the main ones, because the carburetor supplies fuel to the engine and thanks to this, the scooter begins to move. Accordingly, tuning begins with the installation of a more complex carburetor design. To do this, just install guides on the sides, which will increase the speed of the scooter by 5 km per hour. We also recommend that all scooter owners adjust the carburetor; by setting the optimal parameters, your scooter will correctly reach its maximum speed.
Installing a forced piston on a scooter
If you bought a scooter with a standard cylinder-piston group with a volume of 50 cm3, most likely the best and simplest thing will be tuning the CPG, or rather replacing the standard part with a sports one. Many manufacturers produce tuned versions with increased volume; it is possible to buy a 75 cm3 piston, which will give a significant increase in power. The piston group is replaced in the traditional way; if possible, some parts will have to be replaced so that they can withstand the load of a sports CPG. Also, the disadvantage of such manipulation is the impossibility of replacing a certain part, for example, if a piston breaks, it is almost impossible to find it separately.
How to increase the speed of a scooter
In some ways, it is possible to slightly increase the speed by removing the limiter, although many scooter owners do this immediately after purchase. If you have insufficient skills, it is recommended to entrust this tuning to specialists, otherwise a small mistake will lead to a complete breakdown of your scooter. Increasing the speed of a 150cc scooter will be a little more difficult, because the maximum speed of such an engine will be quite high. But again, there are a lot of tuning parts that will help quickly solve the problem of maximum speed.
Foreign units
Such products almost always boast of excess power, but do not forget about the limitations. This is a standard market technique when only one product is sold to customers, but in different forms. This means that by purchasing an affordable motor, you can remove the limiter and get a more powerful motor, but for the same money. In addition, it is possible to use the original method for forcing. Experts note that absolutely all engines have a certain reserve for increasing power, but the implementation of some ideas may take too much money.
Scooter tuning - accelerating the moped to full power
In recent years, scooters have become increasingly popular among lovers of two-wheeled vehicles. Tuning in this case can be divided into two stages: modifying the engine to increase its power and adjusting the transmission elements to the changed engine parameters. Some owners also carry out external tuning of the scooter, for which they purchase original accessories.
Classification of motors and modernization options Today, scooters are produced with several types of motors. The most popular version of a small cc engine is the Chinese model 139qmb with a displacement of 49.6 cc. Next comes the 153QM model with a volume of 150 cm3 and the 157QMJ with a volume of 150 cm3. Thus, within each type of Chinese motor, the main engine parts are in principle interchangeable. This means that finding parts becomes an easy task.
Previously, the most popular scooter tuning kits were “whales” from Italian manufacturers Pallinni, Mallossi or Metrakit. These tuning kits, as a rule, include a huge range of parts, accessories and equipment for tuning scooters from well-known European, Japanese and Chinese manufacturers. However, in the case of Chinese-made mopeds, tuning with the help of European “whales” is too expensive for ordinary motorcyclists, and there are more and more Chinese scooters on our roads every year.
Today, tuning a scooter mainly comes down to increasing the engine capacity. The most tuned engines are 139qmb engines with a volume of up to 50cc. For example, instead of a standard piston and cylinder of 39 millimeters, wider analogues with a piston diameter of 44 to 50 millimeters are installed. In contrast to European and Japanese-made models, tuning of the “Chinese” mainly comes down to an increase in cubic capacity, as a result of an increase in engine power and the need for appropriate adjustment of the variator and other parts. And if with a 44 mm piston you can leave the factory cylinder head, then when replacing the 39 with a 52 mm version, you will have to change the cylinder head and recalibrate the carburetor. Thus, the easiest way to increase the cubic capacity for a 139qmb engine is to install a 44 mm piston, and you will also need to purchase additional gaskets. As for the larger Chinese-made engines (157QMJ and 153QM for 150 cm3), they are built on an identical platform and externally differ from the 139qmb model only in their longer length.
Removing the speed limiter “plug” The first thing that specialists and tuning enthusiasts do on scooters of various manufacturers is to remove the speed limit “stub”, which prevents the maximum use of the engine resource. As a rule, a scooter can be muffled in several ways: either a plug installed in the variator, or an electronic limiter on the switch, or a special limit washer in the scooter's carburetor.
In the first case, the limiter is a plate that is screwed to the variator from the side of the weights. Due to the installation of this plate, the radiator belt cannot reach its maximum radius while driving. To remove the plug, you need to partially disassemble the variator, remove the belt and gear, carefully remove the restrictor ring and assemble all the parts in the reverse order.
On some models there may be a missing ring, then it is advisable to disassemble the inner “cheek” of the variator and look for the plate there. Sometimes the limiter in the variator is the bushing itself, which has a small protrusion. Accordingly, it will not be possible to remove it; you will have to either bore the part from a familiar turner or a service center, or purchase a new original bushing.
If the limiter is installed in the carburetor, then it looks like a valve, which, in the event of an increase in pressure, blocks the flow of the fuel mixture into the mixing chamber with air. On modern Japanese scooters, the choke is installed in two places on the muffler. To find the plug and get rid of it, you need to look at the muffler and see at the very beginning a double branch, one of the channels of which goes to a dead end. This branching creates excessive circulation of gases, so it must be removed.
And finally, an equally common place to install the limiter is the switch. On Italian scooters, to remove it you need to cut the blue wire going to the switch. If we are dealing with the “Japanese”, then most likely we will have to change the switch to a tuned version. On Chinese models, the plug is the speed reader and the washer on the clutch of the 139qmb engine; the problem can be solved by disconnecting the wire from the reader using wire cutters.
Features of improving the carburetor, cylinder head and variator After disconnecting the plugs, you need to proceed to the next tuning steps. To begin with, it is recommended to replace the factory muffler with an improved version with a resonator. Well-known models include Laser X, Technical Next or Leovince. After installing the new pipe, the transmission must be properly adjusted. Such changes will increase the maximum speed by 7-10 kilometers per hour and improve acceleration dynamics.
Next, you should install a new carburetor with an increased diffuser diameter. For models of Chinese mopeds with a cubic capacity of up to 150 cm3, it is best to purchase carburetors with a stroke diameter of 17.5-20.5 millimeters. Which manufacturer to choose is up to the owner to decide, but some experts advise purchasing models of inexpensive and fairly reliable carburetors produced by DellOrto. When carrying out all of the above work, it is also recommended to install a tuned variator; it will be easier to adjust it yourself to new parameters, since it has a more advanced structure. You can choose models from the Italian manufacturer Polini, which are equipped with a special lubrication system for the main rod.
But the most effective way to really increase the power of a small-capacity scooter is to install a new cylinder-piston group of increased volume. It is important to remember that if you are tuning a scooter with the installation of an improved piston group, it is strongly recommended to check the degree of wear of the crankshaft and bearings, since if they are in poor condition, tuning will completely “kill” them after 1000-2000 kilometers with new parameters. This is where many people who want to tune their scooter stop, especially when it comes to an engine like 139qmb. Further actions can be attributed to racing tuning, and in terms of costs and volume of work they are comparable to purchasing a new, more powerful and voluminous scooter with 150 or 225 cc with sports characteristics.
Another technical tuning option is installing a carburetor enricher. In essence, it is a small additional carburetor that is connected to the main one through three exhaust channels. Sometimes this part is called an automatic starting enrichment. In addition, “racing” tuning of mopeds involves installing a reinforced crankshaft, connecting rod and replacing factory bearings. Only such changes can withstand the new loads that will appear with an increase in engine power.
other methods
You can increase the power of a boat motor with your own hands if you use the following recommendations:
- Boring of existing jets. Such manipulations will help restore the correct geometry of the parts.
- Grooving the cylinder or inlet/outlet holes. This option is relevant for severe wear.
- Select the correct proportions of oil and gasoline for your boat engine. In this case, the technician does not need to disassemble the engine. Many performance indicators of the unit depend on the quality of the fuel.
Manipulations to restore engine power are varied. The final choice of one option or another directly depends on the type of motor. The most unpretentious are two-stroke models.
