Timing Chain, Sprockets And Rollers - Derbi GPR125 Workshop Manual

4 - ENGINE

TIMING CHAIN, SPROCKETS AND ROLLERS

Check the condition of the chain, control sprockets and ro-
llers.
N.B.
1. Inspect:
- Timing chain.
Stiff/damaged => Renew chain.
2. Inspect:
- Control sprockets.
Damage/wear => Replace the sprockets and the timing
chain.
(1) 1/4 of the tooth
(2) Correct
(3) Roller
(4) Sprocket
3. Inspect:
- Timing chain rollers (exhaust) (1).
- Timing chain rollers (inlet) (2).
Damage/wear => Renew.
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THE CONDITION OF THE TIMING
CHAIN TENSIONER CAN HELP TO
INDICATE WHETHER THE CHAIN
IS OUT OF SERVICE.