1986-1987 Honda TRX350 FourTrax 4X4, 1987-1989 TRX350D Foreman 4X4 Service Manual, Page 76Get this manual
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CYLINDER HEADVALVES NOTE Ream the guides to remove any carbon deposits before checking clearancesTOOL: Valve guide reamer, 5.5 mm
Do not use larch 10 heat the cylinder head; it may cause warping