YCF 50 A Owner's Manual page 119

THROTTLE GRIP OPERATION/FREE-PLAY ADJUSTMENT
Your Mini-Motorbike's throttle valve inside the carburettor 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-Motorbike remains in good working condition. Excessive cable play will hinder the throttle response.
Conversely, if there is no play in the throttle, your Mini-Motorbike will run nippily and quite unpredictably
when the throttle grip is twisted.
(A) Dust cover
(B) Locknut
(C) Adjuster
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.
5. If you encounter a problem after adjusting the free-play from the top then pull the rubber boot off the
top of the carburettor and make the adjustment at the lower end of the cable. Tighten the locknut and
put the rubber boot back in place.
6. Check for frayed cable or damaged cable housing. Turn the handlebar to the left and right while
twisting the throttle. It should move smoothly.
7. 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 C
B
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