2009-2011 Honda FourTrax Rancher AT TRX420FA/FPA Service Manual, Page 237Get this manual
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CYLINDERPISTON
Unit: mm (in) SERVICE LIMIT 86.60 (3.409) 0.10 (0.004) 0.10 (0.004) 0.10 (0.004) 86.42 (3.402) 19.04 (0.750) 18.96 (0.746) 0.08 (0.003) 0.5 (0.02) 0.6 (0 .02) 0.9 (0 .04) 0