2-26 PERIODIC MAINTENANCE
Periodic Maintenance Procedures
Piston/Cylinder Clearance Inspection
The piston/cylinder clearance is measured whenever a
piston or cylinder is replaced with a new one. The standard
piston/cylinder clearance must be adhered to whenever the
cylinder is replaced.
If only a piston is replaced, the clearance may exceed the
standard slightly. But it must be within the standard, in order
to avoid piston seizure.
The most accurate way to find the piston clearance is
by making separate piston and cylinder diameter measure-
ments and then computing the difference between the two
values. Measure the outside diameter [A] of the piston 7.5
mm (0.30 in.) [B] up from the bottom of the piston at a right
angle to the direction of the piston pin, and measure the
cylinder diameter at the very bottom of the cylinder.
0.045 ∼ 0.067 mm (0.0018 ∼ 0.0026 in.)
Piston, Piston Ring and Piston Pin Replacement
Refer to the Cylinder and Piston section in the Engine Top
Exhaust System Inspection
The exhaust system, in particular the muffler body, is de-
signed to reduce exhaust noise and conduct the exhaust
gases away from the rider while minimizing power loss. If
carbon has built up inside the muffler body, exhaust effi-
ciency is reduced, causing engine performance to drop.
If the muffler body is badly damaged, dented, cracked or
rusted, replace it.
If the exhaust noise becomes too loud or engine perfor-
mance drops, replace the silencer wool.
Silencer Wool Replacement
Right Side Cover (see Side Cover Removal in the Frame
Muffler Cover Bolts [A]
Muffler Mounting Bolt [B]
Remove the muffler cover [A].
Tap the bracket [B] with a plastic hammer [C] to separate
the cover and pipe.