This are some causes of your poor running performance. Spark plug, IC igniter, pickup coil and ignition coil. Spark plug maybe dirty broken or maladjusted that it can't give the engine the right amount of electricity needed. Battery may cause this also if the voltage is low. Make sure that the amount of electrical power that your engine receive is enough to power your combustion performance. pickup coil, ignition coil and IC igniter may also be in trouble that is why you can;t attain the power needed by the engine for great performance.
One more reason to cause this problem is your carburetor performance. If your carburetor can't supply the right fuel and air mixture, the combustion in the engine will not be enough to power the performance of the scooter. Check also for clogged passage like the pilot jet, pilot passage and air bleed holes, this may interrupt the proper mixing of fuel and air in the main chamber of the engine. Air cleaner, float bowl and fuel tank air vent also may have problems. Check them for clogged, fuel level or loose mounting.
Your compression may be low. If you have encountered problems inside the engine make sure to bring it to your mechanic. They can check the condition of the inside parts for any problems. Cylinders, piston, piston rings and valve damaged or worn may caused some problem with the performance. Ready your budget for some needed parts in case of parts are need to be replaced by a new one.
In overall, electrical power supply, carburetor synchronization and engine worn parts are the reason of the problems.
The same case if you also encountered a poor running performance in high speed. I just need to add some reasons on this problem. Carbon built up in the combustion chamber together with poor quality of fuel, wrong spark plug and trouble with the IC igniter also causes this problem. Wrong choose of exhaust system also may add a factor on this. If you are choose the wrong type of exhaust pipes it may cause the engine some problem with the performance like if the exhaust pipe doesn't fit with the power of your engine it can reduce the outflow of burned gas in the chamber making the mixture incorrect. Choose the right pipe for your engine.
If the throttle valve is not fully open the intake of the air will not match the fuel injected making the mixture unbalance. Brake and clutch dragging may cause this problem also. Overheat engine may lower your scooter performance. Check the level of the engine oil and make sure it never gets too high. In addition is to check also the viscosity of the oil in the engine.
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