Valve Clearance Adjustment - Yamaha GRIZZLY 125 Owner's Manual

2. Connect the tachometer to the spark plug
lead, and then set the idle to the specified
idling speed by adjusting the throttle stop
screw. Turn the screw in direction a to
increase the engine speed, and in direction
b to decrease the engine speed.
Specified idle speed:
1,650–1,750 r/min
a
1. Throttle stop screw
q
b
8-18
EBU00303

Valve clearance adjustment

The correct valve clearance changes with use,
resulting in improper fuel/air supply or engine
noise. To prevent this, the valve clearance must
be adjusted regularly. This adjustment however,
should be left to a professional Yamaha service
technician.