Fitting the automatic stretcher
– Fit the preassembled automatic stretcher 1 with a new gasket.
– Fit the two screws (M6x20) with the 6x10x1 copper rings and
tighten them to 8 N·m.
– Using a screwdriver, push in the pressure pin until a slight re-
sistance is felt, then push it in one further notch.
– Fit the compression spring and the clamp screw with a new re-
taining ring and then tighten to 10 N·m.
A
Adjusting the play of the valves
- Valve play A is measured between the valve stem and the ad-
justing screw when the engine is cold.
Cold valve play: 0.12 mm
NOTE: IF THE PISTON IS NOT AT THE TOP DEAD CENTRE,
THE VALVES ARE ACTUATED BY THE ROCKER ARMS AND
THE PLAY OF THE VALVES CANNOT BE PROPERLY AD-
JUSTED. IN THAT CASE, ROTATE THE CRANKSHAFT ONE
MORE TURN AND THEN LOCK IT AGAIN.
– After completing the adjustment, tighten the counternuts to 11
N·m.
– Fit the two valve covers 2 with new gaskets and with screws
(M6x20) complete with retaining rings (6x10x1). Tighten the
screws to 8 N·m.
– Screw in the spark plug and tighten it to 12 N·m.
66
Workshop manual RR 4T - 250 - 400 - 450 - 525
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