2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 213Get this manual
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CYLINDER HEADIVAlVECAMSHAFT
Check the cyli nder head for warpage with straight edge and feeler gaugeS ERVICE LIMIT: 0.05 (OD02 in )
VALVE SPRING
Measur the valve spring free l