1985-1995 Polaris ATV and Light Utility Hauler Service Manual, Page 289Get this manual
ENGINES Magnum Engine DisassemblyInspection 3Release ratchet pawl and push inward on plungerIt should remain locked in position and not move inwardMeasure free length of tensioner springReplace spring if excessively worn5
Replace entire tensioner assembly if any part is worn or damaged
Rocker ArmShaft Removal
12Loosen rocker shaft retaining boltRemove the four bolts securing rocker shaft supports, and remove the supports, rocker shaft and rocker arms as an assembly, being careful not to drop the dowel pins into the engine