How to Adjust Motorcycle Valve

1. Adjust the throttle adjusting screw and idle adjusting screw. If the idle speed cannot be adjusted, the carburetor is faulty. You can remove the carburetor, thread a 0.2mm filament through each hole, and blow out each channel and measuring hole with a high-pressure gun.

2. Check whether the throttle cable is flexible or whether the throttle spring is too soft and replace it. Check whether the idle hole is enlarged due to improper maintenance before, and replace it if it is. If it cannot be solved, check whether the cylinder pressure is appropriate (greater than 600 kPa), check all sealing parts, such as valves and pistons, in turn, and remove them.