Yamaha YZ250F(W) Owner's Service Manual page 230

DRIVE CHAIN SLACK ADJUSTMENT
3 - 31
4. Check:
• Drive chain stiffness a
Clean and oil the drive chain and hold as
illustrated.
Stiff → Replace drive chain.
5. Install:
• Drive chain 1
• Joint 2
• Master link clip 3
CAUTION:
Be sure to install the master link clip to the
direction as shown.
a Turning direction
6. Lubricate:
• Drive chain
Drive chain lubricant:
SAE 10W-30 motor oil or
suitable chain lubricants
DRIVE CHAIN SLACK ADJUSTMENT
1. Elevate the rear wheel by placing the suit-
able stand under the engine.
2. Check:
• Drive chain slack a
Above the seal guard installation bolt.
Out of specification → Adjust.
Drive chain slack:
48 ~ 58 mm (1.9 ~ 2.3 in)
NOTE:
Before checking and/or adjusting, rotate the
rear wheel through several revolutions and
check the slack several times to find the tight-
est point. Check and/or adjust the drive chain
slack with the rear wheel in this "tight chain"
position.
INSP
ADJ