Chapter 7 – Cylinder head and valves
Manual de Oficina AJP PR3/PR4 (2015) 7 - 11
TIMING CHAIN INSTALLATION
Tie a string on the chain to aid in assembly
and introduce it by the camshaft hole in the
cylinder head.
Install the timing chain on the crankshaft gear,
and keep it in tension with the string tied in the
engine crankcase hole.
Note:
Tie a string to the chain to keep it in
tension and prevent it from falling into the
engine or jump off the sprocket on the
crankshaft, as older engines may not have
installed the protection plate.
Fit the protection of timing chain, ensuring that
it is properly positioned so that never touch
the timing chain, but at the same time
preventing the chain to loosen the pinion if it
becomes loose or if the timing gear is
removed outside of the camshaft.
Tightening torque: 10N.m (1,0Kgf.m)
Note:
When installing a new chain protection,
you may need to adjust your profile, by folding
the tab on the edge of the plate with pliers
until the correct position with the timing chain,
according the engine either 125 or 200/240cc,
since the protection plates may not all have
the same format suitable.
Note:
The engines 125 / 150cc, the edge of
the protective plate must be aligned with the
center of the timing chain links, but never
touch the chain.
In engines 200 / 240cc, the cover plate after
tightening in the crankcase, must be
assembled with the flap end from outside,
between the chain and the distribution pinion,
so that the base of the "elbow" is almost
leaning the chain, and act as protection to
prevent the timing chain jump off the sprocket
on the crankshaft if the rack is disassembled
on the camshaft.
Place distance washer on the crankshaft and
install the flywheel with the starter gear.
Install the gear / freewheel starter on the
flywheel.
