MOTORPARTS 9936650 Instrucciones De Montaje página 20

– Slightly smear the four nuts (M8) threads with engine oil.
– Tighten the four head nuts (M8) in a crossed pattern and with
a tightening torque of 27 Nm.
– Tighten the two side screws (M6) securing head to crankcase
with tightening torque of 10 Nm.
– Position the crankshaft at the top dead centre and align the
mark situated on the generator fan with the reference on the
crankcase (Fig. 3).
– Fit the timing chain on the gear.
– Insert the gear on the camshaft and align its reference points
(Fig. 2) with the valve cover rest surface on the head.
– Recheck the alignment of the crankshaft and camshaft timing
reference points.
– Should it be incorrect repeat the operation.
A wrong timing would cause serious damages to the engine
– Assemble and tighten the two M5 screws fastening the camshaft.
Tightening torque of 9 Nm.
– Remove the iron wire from the timing chain.
• Chain tensioner assembly
– Insert a screwdriver in the hole and turn the screw clockwise
fully home (Fig. 4).
– Fit the chain tensioner on the cylinder. Use the new gasket
provided with the kit.
– Loosen the chain tensioner screw by turning it counter clockwise,
make sure that it is slackened, and put on the screw cover.
– Turn the crankshaft by some turns and during the compression
phase bring the engine again at the top dead centre; then check
the correct alignment of camshaft and rotor. If it is wrong, realign
them.
• Valve clearance adjustment
When the engine is at the TDC during the compression phase
(all marks aligned) check and if necessary restore the right valve
clearance by working the rocker arm adjusting screws as follows:
Tightening torque of adjusting screw lock nuts
Intake valve clearance
Exhaust valve clearance
– Refi t the valve cover (Fig. 1).
20
10 Nm
0.08 ↔ 0.12 mm
0.22 ↔ 0.26 mm