1999-2002 TRX400EX Fourtrax Service Manual, Page 111Get this manual
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8CYLINDERPISTON INFORMATION TROUBLESHOOTING
84.96084.985 (3.34493.3459)
Piston, piston pin, piston ring
20.008 (0.78750.7877)
19.99420 .000 (0.78720.7874)