2009-2011 Honda FourTrax Rancher AT TRX420FA/FPA Service Manual, Page 218Get this manual

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CYLINDER HEADNALVE VALVE SPRING Check the valve springs for fatigue or damageMeasure the valve spring free lengthSERVICE LIMITS: Inner: 42.08 mm (1.657 in) Outer: 42.76 mm (1.683 in)
Ream the va

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