Lubricating The Drive Chain - Yamaha YFM90 2019 Owner's Manual

4. To tighten the drive chain, turn the drive chain
slack adjusting nut in direction (a). To loosen
the drive chain, turn the adjusting nut in direc-
tion (b) and push the rear wheels forward.
NOTICE: Improper drive chain slack will
overload the engine as well as other vital
parts of the ATV and can lead to drive
chain slippage or breakage. To prevent
this from occurring, keep the drive chain
slack within the specified limits.
5. Tighten the locknut, and then the bolts and
nuts to their specified torques.
Tightening torques:
Locknut:
22 N·m (2.2 kgf·m, 16 lb·ft)
8
Bolt:
45 N·m (4.5 kgf·m, 33 lb·ft)
Nut:
54 N·m (5.4 kgf·m, 40 lb·ft)
6. Adjust the rear brake lever free play. (See
page 8-24.)
EBU24883

Lubricating the drive chain

The drive chain must be cleaned and lubricated at
the intervals specified in the periodic maintenance
and lubrication chart, otherwise it will quickly wear
out, especially when riding in dusty or wet areas.
Service the drive chain as follows.
ECB00562
NOTICE
The drive chain must be lubricated after wash-
[ECB00543]
ing the ATV or riding in the rain or wet areas.
1. Clean the drive chain with kerosene and a
small soft brush. NOTICE: To prevent dam-
aging the O-rings, do not clean the drive
chain with steam cleaners, high-pressure
washers or inappropriate solvents.
8-27
[ECB00572]