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.
How to get the most out of a scooter with tuning?
Scooter tuning is a fairly extensive process, but consists mainly of styling (improving appearance), chassis tuning (modifying driving characteristics) and engine tuning. The last point consists of many different operations that are aimed at increasing engine power, its better implementation and increasing acceleration and maximum speed. Below we will consider modifications to the engine and transmission.
It’s worth noting right away that the scheme is general and suitable for Italian, Japanese and Chinese models. Those who doubt the quality of Chinese scooters should be reminded that the level of production of modern models from the Middle Kingdom has increased significantly over the past 10 years, and most of the spare parts on the market for all models are from Chinese manufacturers.
There are many ways to speed up your scooter and, first of all, they depend on the current technical condition of the unit. Let's take, for example, an old scooter with an incorrectly configured variator, a clogged air filter, a dirty carburetor and a number of other problems that arise when the equipment is not properly maintained. Such an engine has great potential, but it can only be realized after proper tuning. After thorough cleaning and adjustment of all systems, even standard engine performance will seem like a significant improvement.
It follows that any work aimed at improving driving performance must begin with a complete revision of the engine.
Removing factory limiters is a very popular type of tuning and quite simple. Most of the Japanese equipment and similar Chinese equipment comes from the factory with special limiters that do not allow the engine to operate at full power. Fortunately, you can get rid of restrictions in any garage, and any tuning of a scooter with your own hands begins with the elimination of such restrictions.
When childhood illnesses are over, it is worth paying attention to real tuning, namely, improving or modifying existing components and assemblies. We are talking, of course, about the cylinder-piston group, carburetor, muffler, variator, air filter and ignition system. At this stage, the degree of involvement in improving a particular element depends on the budget. If funds are limited, then we will make the most of the existing set by modifying the described units.
If you have a certain budget for tuning, you can go the route of replacing parts with special tuning ones. Special parts designed for such modifications automatically improve the basic characteristics of the engine, plus they are designed for higher loads. We have figured out the general scheme of improvements, and below we will look at how tuning occurs, using examples of specific components.
We remove the engine.
Specialists, experts or garage technicians begin tuning a scooter with their own hands by dismantling the factory limiters. They are necessary to, firstly, keep the equipment within the established speed limits (Japanese models), and also to increase the service life of the motor. The problem is that you can find this element only after studying your engine model on various forums. The reason for this is the different locations of these same limiters, it could be a blind fork in the exhaust, an electronic limiter installed on the variator or even in the carburetor.
- Plug in the variator. In this case, the part is a special plate mounted on the side of the weights. It prevents the belt from reaching its maximum radius, which means it is impossible to achieve the maximum possible speed. If you have such a part, then by removing it you can significantly increase the maximum speed.
- Limiter in the variator. Sometimes the limiter is the lip on the bushing itself; here you cannot do without the work of a turner. By loosening the limiting edge of the variator, you can increase the speed. Also for many models a ready-made, bored part is sold.
- Carburetor. In this assembly, the plug looks like a valve. With a significant increase in pressure, it opens, thereby preventing the full entry of the air-fuel mixture into the combustion chamber. This can all be treated as in previous options - by dismantling the element or replacing the entire part.
- Exhaust. An interesting restriction system is located in the exhaust. It represents a branch where one of the channels is a dead end. Thus, turbulence and internal pressure in the exhaust increase, which prevents high-quality purging of the combustion chamber. The problem can be solved by brewing dead-end branches.
- Electronic system. Finally, the switch limiter can be considered the most advanced by modern standards. Some Chinese and Italian models can be deceived by cutting the limiter wire, for this you will have to study a lot of literature on electrical engineering. Other models get rid of the problem by simply replacing the unit.
We adjust valves (4t engines).
As mentioned earlier, the engine must be serviced before boosting. Work that will help improve dynamics includes adjusting the valves. The procedure is suitable for tuning Chinese 4t scooters and other 4-stroke engines. For small-capacity equipment, it is recommended to carry out such adjustments at least once every 3, and preferably once every 2 thousand km. It is also necessary to carry out adjustments after manipulations with the CPG.
Before you begin, you need to make sure that the engine has completely cooled down and that you have a set of keys (8,9) and feelers of 0.05 for the intake valve and 0.07 mm for the exhaust valve at hand. You can get to the adjusting nuts by first removing the valve cover. When access to the valves opens, the piston is installed at top dead center. Next, a feeler gauge is installed in the intake valve gap and, depending on the current position, an adjustment is made.
To increase or decrease the clearance, you need to loosen the lock nut (while holding the adjusting bolt), turn the adjustment bolt and, while holding it, tighten the lock nut back. Thus, we achieve a gap when the probe passes into it with little effort. After adjustment, make a full revolution of the crankshaft and make sure that the adjustment is accurate.
AC switch
It differs from DC switches in the ability to do without a stable 12V current. It is designed a little differently, because, despite having a more conventional design, it has a more complex connection to the electrical circuit. Unlike DC switches, AC switches are mostly without a speed limiter due to their small size and fairly simple design; they can boast the ability to function perfectly in the absence of a number of nodes, without which a DC switch
will not be able to work in principle. Even if you remove the battery, relay-regulator, ignition switch, keep only the high-voltage generator coil and the Hall sensor, and the scooter will still start and drive. There are quite cleverly organized switches of the provided type that can compete with the DC type, but this is rare. Despite the lack of need for direct current, speakers are very dependent on alternating current and the relationship between the engine block and the frame, and if you burnt or damaged one coil in the generator, which produces high voltage, then the scooter will not start under any circumstances.
Tuning the carburetor and air filter.
The basic principle of driving fast is to burn more gasoline per unit of time, it is suitable for tuning Chinese 4t scooters, Japanese 2t scooters and any other models and types of engines, and the carburetor helps in this, first of all. You can modify the standard unit by installing more efficient jets, but in practice it is better to install more efficient models. Scooter tuning is made easier due to productive models of carburetors produced by DellOrto, a set of pipes and other accessories for them.
A high-performance carburetor will deliver more fuel to the cylinder, and more fuel requires more air. Therefore, the standard filter should be reviewed; it is best to replace the filter element with a new one, while making sure that the entire system is tight. If you are preparing a high-power device, it makes sense to install a minimum resistance filter, but do not forget that it requires constant care, otherwise the filter element will dry out and sand will begin to get into the engine.
Scooter ignition switches
This type of switch often has an engine speed limiter, which allows you to increase its service life. From us you can buy standard scooter switches:
- CDI GY6 125/150СС 152QMI/157QMJ;
- CDI GY6 50CC 139QMB;
- CDI HondaDio AF18;
- CDI Honda Dio AF-27;
- CDI Honda Dio ZX AF-34;
- CDI Honda Dio ZX AF-35;
- CDI Honda Dio ZX AF-34 small. plug;
- CDI JH70 Delta;
- CDI Yamaha Jog 3KJ;
- CDI SuzukiLet's AS50;
- CDI switch Honda Dio AF-27;
- CDI JH110 Delta;
- CDI Honda Lead 90CC;
- CDI JH70 Delta;
- CDI GY6 with wire;
- CDI Yamaha Jog 3KJ;
- CDI GY6 139QMB/152QMI/157QMJ;
Also on sale are CDI switches combined with an ignition coil:
- CDI TB50 Suzuki Ran (BM Style/Joy) - suitable for Chinese scooter engines with chain drive;
- CDI E0120 Suzuki Address AD50 50CC.
Exhaust tuning.
It is better to immediately replace the standard exhaust of a scooter with a sports one. Alas, the production of this system is a very precise and labor-intensive process, so it is very difficult to create an effective exhaust, especially for 2t engines, with your own hands. We recommend purchasing ready-made kits in a special store. Well-known models include Laser X, Technical Next or Leovince. With the new pipe, the engine will breathe easier, throttle response at high speeds and maximum speed will increase.
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.
Cleaning the cylinder, boring windows.
Improvement suitable for scooters with two-stroke engines. Their peculiarity is that very often the casting inside the drain and exhaust channels is defective, that is, it has roughness. These shortcomings lead to the fact that the piston is not blown through properly and, accordingly, loses power. Having removed the cylinder and armed with a rolling cutter, you can polish the channels, and then round off the sharp edges on the inside. When tuning scooters, in the photo you can see the differences between the motor before and after polishing. This action will help make the engine work easier at high speeds and potentially add a couple of kilometers to the top speed.
You can go further and increase the diameter of the inlet/outlet windows. For each 2T engine, this parameter is calculated individually. For example, it is enough to bore some 50 cc engines by 1 mm to obtain optimal intake/exhaust parameters. Do-it-yourself tuning of a 150cc scooter and other engine sizes is done in the same way.
Rear gearbox
50cc scooters
with an automatic transmission is that even with a significant increase in the power of their engine (especially due to an increase in its volume), their maximum speed increases slightly, since the device is overly strangled by the rear gearbox (its gear ratio is too high for the increased engine power).
Therefore, the next step after increasing the cylinder volume should be the purchase of a tuning kit for the rear gearbox (the so-called Gear Kit). Typical Gear Kits reduce the rear gear ratio by 50-70%, increasing the maximum speed of your scooter by about the same amount (at the cost of slightly reducing throttle response) - of course, if you have enough engine power. With an 85cc road-class cylinder and Gear-Kit, a regular Yamaha Jog reaches speeds of 110-120 km/h, with a racing cylinder even higher.
Cylinder-piston group.
Finally, the most effective improvement for any engine is replacing the CPG. But not just a replacement, but the installation of a new, larger piston. Fortunately, there are now many ready-made kits on the market; you don’t have to sharpen or adjust anything, as with Soviet equipment. Moreover, there is even a lot to choose from. For example, for various models with a volume of 50 cubic meters, they offer kits to increase to 63, 72, 82 and even 90+ cubic cm. In some cases, this is an almost double increase in power.
The situation is similar with larger engines, for example, for 125 cubic meters, sets of 150 or 170 cubic meters are sold. Some, in the process of tuning a scooter, manage to increase 150 cubic meters with their own hands to 225 cubic meters. Choosing the right part is not the most difficult thing, the most difficult thing is installing it. After all, this process involves almost complete disassembly of the engine. You will be faced with the need to have several special removable keys in your arsenal; you can ask them from friends or borrow them for the evening at auto repair shops. We strongly recommend studying the technical component in order to properly disassemble, replace the necessary elements and assemble the motor.
Alas, for some, increased power does not promise anything other than breakdowns or inadequate performance. This is because by significantly increasing power, you inevitably entail work on all other nodes. Let's imagine that we installed a new 92 cc CPG on an old 50 cc engine. The first thing to check is the condition of the connecting rod, crankshaft and bearings. Otherwise, they will fly first, followed by our new system of both cylinder and piston.
Great, we added new bearings to the CPG, an elbow with a connecting rod, now we can be sure of reliability. But the engine does not go faster, and we decide to purchase a new carburetor. Now the mixture is too rich, and we understand that the exhaust needs to be changed. After such modifications, the engine sounds loud, accelerates perfectly, but the maximum speed is slightly higher than before and the variator sounds strange. After installing a high-speed CVT, for example from the Italian manufacturer Polini, the engine will be able to fully realize its new power. The last stage is an inspection of the brake system; you don’t want to find out at a speed of 60 km/h that the brakes are now comparable to bicycle ones.
As a result, after replacing almost all the components, we got a very fast “flea” that can surprise your friends and experts in this technology. Over time, you can make changes to the chassis system, replace shock absorbers, and install more attractive wheels. Often, the modernization process does not stop there, and after tuning a scooter 50, 150 with your own hands, impressive improvements in appearance are made. The moped is repainted, panels are changed, new devices, lighting, and so on appear.
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.
