Yamaha DT125RE 2005 Service Manual page 157

CHECKING THE DRIVE CHAIN
This motorcycle has a drive chain with
small rubber O-rings
chain side plates. Never use high-pressure
water or air, steam, gasoline, certain sol-
vents (e.g., benzine), or a coarse brush to
clean the drive chain. High-pressure met-
hods could force dirt or water into the drive
chain's internals, and solvents will deterio-
rate the O-rings. A coarse brush can also
damage the O-rings. Therefore, use only
kerosene to clean the drive chain. Don't
soak drive chain in kerosine more them ten
minutes. O-ring is damage by kerosine.
4. Check:
5. Lubricate:
6. Check:
4-69
CAUTION
• O-rings
Damage Replace the drive chain.
• drive chain rollers
Damage/wear Replace the drive chain.
• drive chain side plates
Damage/wear Replace the drive chain.
Cracks Replace the drive chain and
make sure the battery breather hose is
properly routed away from the drive chain
and below the swingarm.
• drive chain
Recommended lubricant
Engine oil or chain lubricant sui-
table for O-ring chains
• drive sprocket
• rear wheel sprocket
More than 1/4 tooth k a wear
the drive chain sprockets as a set.
Bent teeth Replace the drive chain
sprockets as a set.
k b Correct
Drive chain roller
Drive chain sprocket
CHAS
between the drive
Replace