1981-1984 Official Honda ATC250R Shop Manual, Page 53Get this manual
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r:::iJ HONDA ATC 250R
Measure the piston pin bore 1.0SERVICE LIMIT: 18.027 mm (0.710 in) Measure the piston pin 0.0SERVICE LIMIT: 17.980 mm (0.708 in) Calculate the piston pin-to-piston clearanc