2007-2008 Yamaha YFM700 Grizzly Factory Service Manual, Page 172Get this manual
CYLINDER HEAD EBS00230
CHECKING THE CYLINDER HEAD 1Eliminate: combustion chamber carbon deposits (with rounded scraper) NOTE: Do not use sharp instrument to avoid damaging or scratching: spark plug bore threads valve seats
2Check: cylinder head Damagescratches Replace cylinder head water jacket Mineral depositsrust Eliminate
3Measure: cylinder head warpage Out of specification Resurface the cylinder headMaximum cylinder head warpage 0.03 mm (0.0012 in)