Polaris Virage TX 2000 Service Manual page 133

ENGINE
Disassembly/Inspection - Polaris Engines
Piston Inspection/Measurement
1 . Check piston for scoring or cracks in piston crown or
pin area. Excessive carbon buildup below the ring
lands is an indication of piston, ring or cylinder wear.
2 . Measure piston outside diameter at a point 10 mm
(3/8") up from bottom of skirt at a 90° angle to the
direction of the piston pin. Record the
measurement for each piston.
NOTE: The piston must be measured at this point to
provide accurate piston-to-cylinder clearance measure
ment.
3. Subtract this measurement from the minimum
cylinder measurement recorded previously. If
clearance exceeds the service limit, determine if
piston or cylinder is worn and recondition or replace
as necessary.
nder Clearance
4 . Position each piston ring 1/2" (1.3 cm) from the top
of the cylinder using the piston to push it squarely
into place. Measure installed gap with a feeler
gauge at both the top and bottom of the cylinder.
NOTE: A difference in end gap indicates cylinder taper.
The cylinder should be measured for excessive taper
and out of round. Replace rings if the installed end gap
exceeds the service limit.
NOTE: Always check piston ring installed gap after re-
boring a cylinder or when installing new rings.
Piston Ring Installed Gap
STD: ,
Service
Cylinder Cleaning/Cylinder Reconditioning
Refer to page 4.43 for cylinder cleaning, honing, and re-
boring information.
3100
4.22
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