2003 Arctic Cat ATVs from 250cc to 500cc Service Manual, Page 51Get this manual

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CYLINDER, PISTON, AND RINGS
Cylinder Trueness
(1st ring) 11,2 mm (max) (0.4409 in,) (2nd ring) 11,9 mm (max) (0.4685 in,) 87,5 82 mm (3.40 3,22 in,) (max) 0,05 mm (0,002 in,)