1986-1987 Honda TRX350 FourTrax 4X4, 1987-1989 TRX350D Foreman 4X4 Service Manual, Page 291Get this manual
TROUBLESHOOTING Probable Cause
10Test cylinder compression using compression gauge
1 1Check valve clearance CORRECT
Valve stuck open Worn cylinder and piston rings Leaking head gasket Improper valve timing Incorrect valve seat contact Improper valve adjustment Worn valve seat
, 2Remove cylinder head cover
and inspect lubrication VALVE TRAIN LUBRICATED PROPERLY
VALVE TRAIN LUBRICATED PROPERLY
Clogged oil passage Clogged oil filteror oil filter screen
13 Check carburetor for clogging
NOT CLOGGED
CLOGGED
Carburetor not serviced frequently enough