Yamaha BIG BEAR YFM400S Owner's Manual download pdf (Page 129)

8-20

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

TE:

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 2. Adjusting bolt

a. Throttle lever free play

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Yamaha BIG BEAR YFM400S Owner's Manual Page 129