1986-1988 Honda TRX 200SX Fourtrax Service Manual, Page 76Get this manual
CYLINDER PISTON
PISTON IN STALLA TION
Position the istonIN" ma rk on the intake va ve side, and instal the pist and piston pin Install new piston pin clips
Do not align the piston pm clip end gap with tDo not leI the cli fall Into the crankcase piston cut
CYLINDE INSTA LLAT ION
Clean off an gasket mat ria from the crankcase surfac
Be care ful not to damage he gasket surface