1986-1987 Honda Fortrax TRX70 Service Manual, Page 64Get this manual
CYLINDERPISTON Measure the piston pin boreSERVICE LIMIT: 13.06 mm (0.514 In)
Measure the piston pin .0
SERVICE UMIT: 12.98 mm 10.S1,1n1 Calculate the piston-to-piston pin learance SERVICE LIMIT: .076 mrn (0.0030 in)
Measure the connecting rod small end LD with small hole
gaugeSERVICE LIMIT: 13.1 mm (0.516 in)
See section 10 for connecting rod replacement procedures
PISTON RING INSTALLATION