Polaris Sportsman 400 User Manual

ENGINE
3.43
PISTON/ROD INSPECTION, CONT.
4. Measure piston ring to groove clearance by
placingtheringintheringlandandmeasuringwith
a thickness gauge. Replace piston and rings if
ring-to-groove clearance exceeds service limits.
PISTON RING INSTALLED GAP
1. Placeeach pistonring insidecylinder usingpiston
to push ring squarely into place as shown at right.
2. Measure installed gap with a feeler gauge at both
the top and bottom of the cylinder . NOTE: A
differenceinendgapindicates cylindertaper . The
cylinder should be measured for excessive taper
and out of round.
3. Ifthebottominstalled gap measurement exceeds
the service limit, replace the rings. If ring gap is
below specified limit, file ring ends until gap is
within specified range.
NOTE: Alwayscheckpistonringinstalledgapafterre-
boring a cylinder or when installing new rings. A re-
bored cylinder should always be scrubbed thoroughly
with hot soapy water , rinsed, and dried completely.
Wipe cylinder bore with an oil rag immediately to re-
move residue and prevent rust.
Piston
Ring
Feeler Gauge
Piston Ring-to-Groove Clearance
Top Ring Std: .0016-.0031I (.040-.080 mm)
Limit: .0059I (15 mm)
Second Ring Std: .0012-.0028I (.030-.070 mm)
Limit: .0059I (15 mm)
25-50mm
Cylinder
Piston Ring
Feeler Gauge
Piston Ring Installed Gap
Top Ring
Std: .0079-.0138I (.20-.36 mm)
Limit: .039I (1.0 mm)
Second Ring
Std: .0079-.0138I (.20-.36 mm)
Limit: .039I (1.0 mm)
Oil Ring
Std: .0079-.0276I (.20-.70 mm)
Limit: .059I (1.5 mm)

Polaris Sportsman 400 Specifications

General

Brand	Polaris
Model	Sportsman 400
Category	Offroad Vehicle
Language	English