2003 Yamaha Motorsports Grizzly 660 Auto. 4x4 Owners Manual - Page 150
2003 Yamaha Motorsports Grizzly 660 Auto. 4x4 Manual
Page 150 highlights
EBU00657 Idle speed adjustment NOTE: A diagnostic tachometer must be used for this procedure. 1. Start the engine and warm it up for a few minutes at approximately 1,000 to 2,000 r/min. Occasionally rev the engine to 4,000 to 5,000 r/min. The engine is warm when it quickly responds to the throttle. 2. Remove panel D. (See pages 8-6 and 8-7 for removal and installation procedures.) 3. Connect the tachometer and set the idle to the specified idling speed by adjusting the throttle stop screw. Turn the screw in to increase engine speed, and out to decrease engine speed. Specified idle speed: 1,450-1,550 r/min 8-35 1. Throttle stop screw 4. Install the panel. 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.