1993 Yamaha YFM80D Badger Supplementary Service Manual, Page 103Get this manual
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INSPECTION AND REPAIR
Valve spring free length: 27.3 [1.07 in]
2 Measure: eSpring tilt Out of specificationReplaceSpring tilt: 1.2 mm [0.047 in]
CAMSHAm 1 Inspect: aCam