Can cause by knocking in your engine because of carbon built up in the chamber and poor fuel quality. Overheating piston slap cause of excessive piston clearance, cylinder and piston worn out, damage connecting rod and piston and holes are worn. Replacement for this parts are needed in case of unrepairable. Valves also may knock if the clearance is improper or the valve springs are weak or damage. If the camshaft bearing is worn it also may cause a noise in your engine. Proper maintenance like changing of engine oil and check up regularly of the engine is required to avoid this problem to happen.
Clutch noise because of weak or damaged damper. The clutch housing may cause this noise also if the plate clearance is excessive and the gears are worn. Loose bolts and attachment parts are not proper. Or other parts are having contact with the other parts resulting some noise in the clutch. Transmission gears are worn or chipped, or there are metal chips that was jammed in gear teeth. Foreign object are sometimes get inside of the transmission gears.
Your belt is worn out causing some noise in the crank case. Be sure to buy the right size of the belt that will fits your transmission.
Shock absorbers both front and rear may also caused some noise in case that they are damaged. Front fork requires oil for proper and smooth shock absorbing. If the oil level gets too low and the springs are weak. In the rear absorber it may cause the noise if the absorber is damage. Replacement for this part are needed in case of total damage and they can't be repaired.
Brakes sometimes gives noises to like when your pads surface glazed. Pad installation are incorrect and the disc is warped. Caliper trouble or low oil level. Bracket and loose bolts are not properly mounted or tightened causing noise the scooter.
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