Cam Chain Adjustment; Valve Clearance Adjustment - Yamaha MOTO-4 1987 Owner's Manual

Cam chain adjustment
The cam chain becomes longer with use,
resulting in improper valve timing and engine
.... noise. To prevent this, the cam chain tensioner
must be adjusted regularly. This adjustment,
however, should be left to a Yamaha dealer.
Valve clearance adjustment
.... __ The valve clearance becomes larger with use,
1. Throttle stop screw
resulting in improper fuel/air supply and
2. Set the idle to the specified engine engine noise.
speed by adjusting the throttle stop To prevent this, the valve clearance must be
screw; turn the screw in to increase adjusted regularly. This adjustment, however,
engine speed, turn the screw out to should be left toa Yamaha dealer.
decrease engine speed.
Standard idle speed"
1,700 r/rain
8-11