4-12 ENGINE TOP END
Camshaft Sprocket Installation
Check crankshaft position to see that the "T" mark [A] on the magneto
ﬂywheel aligns with the index mark [B] on the crankcase.
Remember to pull the camshaft chain taut before rotating the
Pull the lower side of the chain taut and ﬁt it onto the sprocket so
that the line [A] on the sprocket aligns with the make on the sprocket
cover mating surface projection [B].
Fit the sprocket up into place.
Turn the camshaft so that the cam lobes point downward, while
holding the sprocket steady to align the bolt holes [A].
Install the sprocket [B].
Apply a non-permanent locking agent to the camshaft sprocket bolts.
Keep the crankshaft from turning by holding a wrench on the magneto
Tighten the sprocket bolts.
Camshaft Sprocket Bolts: 12 N
Install the camshaft chain tensioner.
Check the camshaft chain timing.
Turn the crankshaft two turns in the counterclockwise, the crankshaft
is at TDC, and re-check the camshaft chain timing.
If the timing mark is aligned, the camshaft chain timing is correct.
Rotation of the crankshaft with improper camshaft timing
could cause the valve to contact each other or the piston, and
If any resistance is felt when turning the crankshaft, stop
immediately, and check the camshaft chain timing.
m (1.2 kgf
m, 8.9 ft