Polaris Magnum 2x4 Service Manual page 180

Engine Disassembly, Cont.
4. Measure free length of spring with a Vernier caliper.
Check spring for squareness. Replace spring if either
measurement is out of specification.
5. Remove valve seals. CAUTION: Replace seals
whenever the cylinder head is disassembled.
Hardened, cracked or worn valve seals will cause
excessive oil consumption and carbon buildup.
Polaris Industries Inc. 3.53
ENGINE
EH42PL/EH50PL Engine
Coil Fatiguel
Squareness
7196