1986-1987 Honda TRX350 FourTrax 4X4, 1987-1989 TRX350D Foreman 4X4 Service Manual, Page 92Get this manual
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CYLINDERPISTON Install the piston and piston pin, using new piston pin clipsNOTE Face the piston "IN" mark toward the intake valve side Do not align the piston pin clip end gap with the piston cutout