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B
C
A
II.3 Main parts adjustments and preventive maintenance
THROTTLE GRIP OPERATION/FREE-PLAY ADJUSTMENT
Your mini motorcycle’s throttle valve inside the carburetor regulates the amount of vaporised fuel injected into the
cylinders, therefore controlling the engine revolution speed. It is imperative that this part of the mini motorcycle
remains in good working condition. Excessive cable play will hinder the throttle response. On the opposite, if there is
no play in the throttle, your mini motorcycle will run nippily and quite unpredictably when the throttle grip is twisted.
Throttle Free-play Adjustment Procedure
1.
Slide the dust cover (A) away from the upper end of
the accelerator/throttle cable.
2.
Loosen the locknut (B) and turn adjuster (C) until the
specified accelerator/throttle cable free-play is
obtained.
3.
Tighten the locknut against the accelerator/throttle
cable adjuster securely.
4.
Slide the dust cover over the adjuster.
If you encounter a problem after adjusting the free-play
from the top:
1.
pull the rubber boot off the top of the carburetor and make the adjustment at the lower end of the cable. Tighten
the locknut and put the rubber boot back in place.
2.
Check for frayed cable or damaged cable housing. Turn the handlebar to the left and right while twisting the
throttle. It should move smoothly.
3.
Then, start the engine in neutral and turn the handlebar to the left and right to make sure the engine idling has
not changed. Changes imply a problem with the cable system. Please contact your nearest authorised YCF dealer
for repair.
(A) Dust cover
(B) Locknut
(C) Adjuster