Yamaha TZ250M1 Owner's Service Manual page 138

PRIMARY DRIVEN GEAR, PRIMARY DRIVE GEAR
AND BALANCER SHAFT
EC4D3000
REMOVAL POINTS
EC4D3101
Primary drive gear and balancer weight
gear
1. Loosen:
• Bolt (primary drive gear) 1
NOTE:
Place an aluminum plate a between the teeth
of the balancer drive gear 2 and balancer
weight gear 3.
2. Loosen:
• Nut (balancer weight gear) 1
NOTE:
Straighten the lock washer 2 tab and place an
aluminum plate a between the teeth of the
balancer drive gear 3 and balancer weight
gear 4.
3. Remove:
• Bolt (primary drive gear) 1
• Primary drive gear 2
• Balancer drive gear 3
• Nut (balancer weight gear) 4
• Lock washer 5
• Balancer weight gear 6
NOTE:
It may sometimes happens that the primary
drive gear and balancer drive gear are fitted
too tight as in force fitting. In that case, use a
general gear puller to remove them without too
much force on the crankshaft.
EC4D4000
INSPECTION
EC4D4100
Primary drive gear, primary driven gear and
oil pump drive gear
1. Inspect:
• Primary drive gear 1
• Primary driven gear 2
• Oil pump drive gear 3
Wear/Damage ≥ Replace.
4-40
ENG