Honda TRX450ER Owner's Manual page 164

6. Check the chain roller ( ) for wear and have it replaced if necessary.
The chain roller must be replaced if it is worn to 1.5 mm (0.06 in).
For replacement, see your Honda dealer.
LEFT SIDE
1.5 mm
(0.06 in)
(1) chain roller
7. Inspect the front and rear sprocket teeth for excessive wear or damage.
If necessary, have your Honda dealer replace a worn sprocket.
Damaged Sprocket
Teeth
REPLACE
Use of a new chain with worn sprockets will cause rapid chain wear.
1
Normal Sprocket Teeth
GOOD
Servicing Your Honda
Drive Chain
(1)
Worn Sprocket
Teeth
REPLACE
155