Fitting the timing gear
– Ensure that the key is properly seated in the crankshaft.
– Heat timing pinion 1 and fit it to the crankshaft with the high
end facing inward. If necessary, gently tap with a suitable
tube.
– Fit Seeger ring 2 with the sharp edge facing outward.
– Degrease the threads of the two screws (M6x25) and apply
Loctite 243. Fasten chain guide 3 and chain stretcher shoe 4
with the two screws 5 (8 N·m) without forgetting the two bush-
es.
Fit the chain stretcher shoe, locking the screw in the seat
in the crankcase B.
NOTE: AFTER TIGHTENING THE CHAIN STRETCHER
SHOE, ENSURE THAT IT CAN SLIDE FREELY.
– Fit the timing chain so that the two stretches have the same
length.
NOTA: The timing chain can also be fitted after fitting the cylin-
der and the cylinder head.
– Degrease the threads of the two screws 7 (M5x16) and apply
Loctite 243. Fit chain guard 6 and tighten the screws to 6 N·m.
– Fit a wire clamp in the two ends of the timing chain (see fig-
ure).
62
Workshop manual RR 4T - 250 - 400 - 450 - 525
1
2
4
3
5
5
B
7
7
6
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