2007-2010 Honda FourTrax Rancher 420 TRX420 TRX Service Manual, Page 269Get this manual
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CLUTCHGEARSHIFT LINKAGE CLUTCH DISC
diSCS and plaes 85
Check the plates for discolorationCheck the plate warpage on surface plale using feeler gaugeSERVICE LIMIT: 0.20 mm (0.008 in)