HER CHEE 2002 ATV-320 S, Service Manual

Page: 33 / 125

Chapter 1 Engine, Transmission & Gear
I-24
CAUTION
◦ Piston rings are easily broken; take care not to
damage them during removal.
Insert each piston ring into the cylinder 20 mm
(0.75 in) in from the bottom. To ensure that it’s
square in the bore, use a piston to push it in.
Measure the ring end gap.
Service Limits: TOP 0.50 mm (0.020 in)
2nd 0.50 mm (0.020 in)
Measure and record the piston O.D. at a point 10
mm (0.4 in) from the bottom and 90
°
to the piston
pin bore.
Service Limit: 75.90 mm (2.9882 in)
Compare this measurement against the service
limit and calculate piston-cylinder clearance.
CYLINDER INSPECTION
Inspect the cylinder walls for scratches and wear.
Measure and record the cylinder I.D. at three
levels in both and X, Y axis. Take the maximum
reading to determine the cylinder wear.
Service Limit: 76.10 mm (2.996 in)
Calculate the piston-to-cylinder clearance. Take
the maximum reading to determine the clearance
Service Limit: 0.10 mm (0.004 in)
Max 0.50mm