Yamaha pw80 - Manual (Page 27)

DRIVE CHAIN SLACK CHECK
NOTE: ________________________
Before checking and/or adjusting, rotate rear
wheel through several revolutions and check
tension several times to find the tightest point.
Adjust chain tension with rear wheel in this
"tight chain" position.
Elevate the rear wheel by placing the suit­
able stand under the engine.
Then measure the play at the bottom of the
chain at a point midway between the drive and
driven sprockets.
The normal vertical deflection is approximate­
ly 40~53 mm (1.6~2.1 in). If the chain deflection
is not as specified, adjust the chain tension.
Drive chain slack (a):
40 ~ 53 mm (1.6 ~ 2.1 in)
DRIVE CHAIN SLACK ADJUSTMENT
CAUTION:
Too small chain slack will overload the en­
gine and other vital parts; keep the slack
within the specified limits.
1. Loosen the rear brake rod adjuster.
2. Loosen the rear wheel axle nut and
lock nuts.
3. To tighten chain, turn chain puller adjust­
ing nut clockwise. Too loosen chain, turn
adjusting nuts counterclockwise and
push wheel forward. Turn each adjusting
nut exactly the same amount to maintain
correct axle alignment. (There are marks
on each side of rear arm and on each
chain puller; use them to check for proper
alignment.)
3. Adjusting nut
4. After adjusting, be sure to tighten the
rear wheel axle nut.
Tightening torque:
60 Nm (6.0 m • kg, 43 ft • lb)
5. Also tighten the lock nuts against the
rear arm.
Tightening torque:
7 Nm (0.7 m-kg, 5.1 ft-lb)
6. In the final step, adjust the play in the
brake pedal.
DRIVE CHAIN LUBRICATION
The chain consists of many parts which work
against each other. If the chain is not maintain­
ed properly, it will wear out rapidly. Form the
habit of periodically servicing the chain. This
service is especially necessary when driving in
dusty conditions.
1. Use any of the many brands of spray type
chain lubricant. First, remove dirt and
mud from the chain with a brush or cloth
and then spray the lubricant between both
rows of side plates and on all center
rollers.
2. To clean the entire chain, first remove the
chain from the machine, dip it in solvent
and clean out as much dirt as possible.
Then take the chain out of the solvent and
dry it. After drying, lubricate the chain to
prevent the formation of rust.
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