Valve Inspection - Polaris PREDATOR 50 2009 Manual

ENGINE / TRANSMISSION
4. Measure free length of the inner and outer springs with a
Vernier caliper, Ill.1. Check spring for squareness as
shown in Ill.2. Replace spring if measurements are out of
specification.
Inner
III.1
III.2
5. Remove valve seals. NOTE: Replace seals whenever the
cylinder head is disassembled.
3.18
Outer
Valve Spring
Free Length
Coil Fatigue / Squareness

Valve Inspection

1. Remove all carbon from valve with a soft wire wheel.
2. Check valve face for runout, pitting, and burnt spots. Check
for bent valve stems using "V" blocks and a dial indicator.
3. Check end of valve stem for flaring, pitting, or wear (A).
4. Inspect split keeper groove for wear or flaring of the keeper
seat area (B). NOTE: The valves cannot be re-faced or end
ground. Valves must be replaced if worn, bent, or damaged.
A
B