Chapter 3 – Maintenance
Service manual AJP PR3/PR4 3 - 18
Remove the crankshaft cover (1) and the
timing chain control point cover (2) and the
camshaft cover (3).
Turn the flywheel counter-clockwise 2-3 turns
to align "T" with the mark in the crankcase.
Confirm that the piston is at top dead center
(TDC) in the compression stroke.
The two valves are with clearance, and the
two brands "
—
" "
—
" (dashes) in the camshaft
gear must be aligned parallel to the face /
surface of the cylinder head.
For 125 / 150cc engines the reference mark
that exists in the camshaft rack is an "O"
which must be facing up, upright and aligned
with a cutout in the form of "V" existing on the
outside of the cylinder head.
Check clearance on both valves through a
feeler gauge between the adjusting screw
and the auxiliary hammer.
Valve clearance value
Intake:
0,05 ± 0,02mm
Exhaust:
0,08 ± 0,02mm
Clearance adjustment on the intake valve
Loosen the lock nut (1) and enter the blade of
the feeler gauge;
