Camshaft Removal; Camshaft Inspection - Polaris PREDATOR 50 2009 Manual

ENGINE / TRANSMISSION
4. Measure O.D. of rocker shaft in 3 places (E).
5. Measure I.D. of rocker arm (F) and compare to
specification.
6. Inspect rocker adjuster screws (G) and the end of the valve
stems for wear, pitting, or damage to threads of the adjuster
or locknut. Replace all worn or damaged parts.
NOTE: Adjuster face is hardened and cannot be ground or
refaced.
E

Camshaft Removal

1. Rocker arms must be removed from cylinder head to
remove the camshaft.
2. Slide camshaft out left side of cylinder head.
3.16
F
G

Camshaft Inspection

1. Inspect cam sprocket teeth for wear or damage.
Inspect for Areas of
Tooth Wear or Damage
Measure height of each cam lobe (H) using a micrometer.
Replace cam if worn below minimum height. Compare to
specification. Check bearings for wear, roughness, or damage.
Cam Lobe Height (50cc & 90cc)
Std: 1.047" ( 26.60 mm)
Limit:1.031"(26.20 mm)
Exhaust
Std: 1.039" (26.40 mm)
Limit: 1.024" (26.00 mm)
2. Thoroughly clean the cam shaft to be sure all oil passages
are clear.
Replace camshaft if damaged or if any part is worn excessively.
H
Intake