Scooter Tuning Adjustment Chart
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Scooter Tuning Adjustment Chart

This table illustrates the adjustment procedure of scooters. An adjustment will often become necessary when parts of the scooter are replaced, even though this does not mandatorily represent an upgrade or tuning. Even the replacement of the exhaust may call for an adjustment of other components of the vehicle. This can be due to different construction designs and modified materials. For the adjustment of the vehicle to new parts mostly only a few steps are needed, but it is very important to provide an optimum driving comfort. Nevertheless, many drivers perform it half-heartedly or do not even pay any attention.

This table is meant to provide some assistance when tuning or purchasing replacement parts. On the left you find the part which is to replace on the scooter. Small crosses indicate what you have to check when replacing the part. Thereby x means that an adjustment is mandatory and (x) that an adjustment may become necessary. Further information you will find when moving the cursor onto the corresponding cross.


Exchanged Part Intake Manifold Tuning Exhaust System CDI Restriction Primary Transmission Secondary Transmission Spare Fan Belt Tuning Fan belt Tuning Clutch Clutch Springs Torque Spring Crankshaft Tuning Air Filter Vario Rollers Tuning Variator Tuning Carburetor Main Jet Slow Jet
Spare Exhaust
(x)Adjusting the main jet to a new exhaust:
When assembling a new exhaust system to a vehicle it’s possible that there is a change in the resonance effect compared to the original exhaust. This is due to slightly different construction of the exhaust systems (cross section, bending, etc.)
When fewer or more exhaust fumes are fed back into the combustion chamber the amount of fuel / air mixture alters as well. In order to adjust this amount a smaller or bigger main jet can be installed. Wether the vehicle has the right main jet set up or not can be detected by taking a closer look at the spark plug. Is the spark plug light grey or white? This means a bigger main jet should be installed. In case the spark plug is black a smaller main jet should be assembled. If the spark plug is brown everything works properly.
Tuning Exhaust
xAdjusting the main jet to a tuning exhaust:
According to the rule of thumb, the main jet should be extended by 3-7% when assembling a racing exhaust. Obviously this number is only a benchmark. The main jet still has to be adjusted. To do so it’s easiest to take a closer look at the outcome to throttling. If the engine gets flooded as you accelerate, the main jet should be exchanged for a smaller version. If the engine is spluttering when you’re stepping on the gas, the main jet is too small and should be exchanged for a bigger one. Once this is done the fine tuning of the main jet is done by taking a look at the spark plug. Is the spark plug light grey or white? This means a bigger main jet should be installed. In case the spark plug is black a smaller main jet should be assembled. If the spark plug is brown everything works properly.
CDI without restriction
Primary Transmission
Secondary Transmission
Tuning Fan Belt
Tuning Clutch
Torque Spring
Tuning Air Filter
xAdjusting the main jet to a tuning air filter box:
According to the rule of thumb, the main jet should be extended by 3-7% when assembling a tuning air filter. Obviously this number is only a benchmark. The main jet still has to be adjusted. To do so it’s easiest to take a closer look at the reactrion to throttle. If the engine gets flooded as you accelerate, the main jet should be exchanged for a smaller version. If the engine is spluttering while when the you’re stepping on the gas, the main jet is too small and should be exchange for a bigger one. When this is done the finetuning of the main jet is bestly done by taking a look at the spark plug. Is the spark plug light grey or white? This means a bigger main jet should be installed. In case the spark plug is black a smaller main jet should be assembled. If the spark plug is brown everything works properly.
Vario Rollers
Spare Variator
Tuning Variator
Spare Carburetor
Tuning Carburetor
50cc Spare Cylinder
50cc Tuning Cylinder
70cc Cylinder
(x)Adjusting the gear to a 70cc cylinder:
Not every type of a 70ccm cylinder will require a modification of the gear. When installing a mid-race or a high end 70ccm cylinder, a gear modification is recommended. This is due to the strong engine power. At the point of the V-belt having its highest transmission ratio, the power unit reaches the limit regarding effective power transmission. A longer gear ratio is required to reach a higher final speed. In regard to the primary transmission it means that the pinion on the gearbox input shaft has to be replaced by a larger one and the gripping pinion on the center shaft by a smaller one. Thus more torque-speed is transmitted to the rear wheel. It is important that primary and secondary gear are tuned consistantly when making profound modifications since pinions with a shorter gear ratio will wear out faster.
(x)Adjusting the gear to a 70cc cylinder:
Not every type of a 70ccm cylinder will require a modification of the gear. When installing a midrace or a high end 70ccm cylinder, a gear modification is recommended. This is due to the strong engine power. At the point of the V-belt having its highest transmission ratio, the power unit reaches the limit regarding effective power transmission. A longer gear ratio is required to reach a higher final speed. In regard to the primary transmission it means that the pinion on the gearbox input shaft has to be replaced by a larger one and the gripping pinion on the center shaft by a smaller one. Thus more torque-speed is transmitted to the rear wheel. It is important that primary and secondary gear are tuned consistantly when making profound modifications since pinions with a shorter gear ratio will wear out faster.
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