Valve Clearance Adjustment; Throttle Lever Adjustment - Yamaha Big Bear YFM400R Owner's Manual

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 clear-
ance must be adjusted regularly. This adjust-
ment however, should be left to a professional
Yamaha service technician.
EBU00307

Throttle lever adjustment

NOTE:
Adjust the engine idling speed before adjust-
ing the throttle lever free play.
1. Loosen the locknut.
2. Turn the adjusting bolt until the throttle le-
ver free play is 3–5 mm (0.12–0.20 in).
3. Tighten the locknut.
1. Locknut
a. Throttle lever free play
8-20
2. Adjusting bolt