1998-2004 Honda Foreman 450 factory service manual, Page 137Get this manual
CYLINDER HEADCYLINDERPISTON TOOLS Valve guide drive, 5.5 mm Valve guide reamer, 5.5 mm Valve spring compressor Valve set cutters Seat cutter, 35 mm (45" IN) Seat cutter, 29 mm (45" EX) Flat cutter, 35 mm (32" IN) Flat cutter, 30 mm (32" EX) Interior cutter, 37.5 mm (60 IN) Interior cutter, 30 mm (60 EX) Cutter holder, 5.5 mm
07742-0010100 07984-2000001 or 07984-2000000 (U .S.Aonly) 07757 -0010000these are commercially available in U.S.A07780-0010400 07780-0010300 07780-0012300 01180-0012200 07780-0014100 07780-0014000 07781-0010101
TROUBLESHOOTING
Engine top-end problems usually affect engine performanceThese problem can be diagnosed by compression test or by tracing engine noises to the top-end with sounding rod stethoscope If the performance is poor at low speeds, check for white smoke in the crankcase breather tubeIf the tube is smoky, check for seized piston ringLow compression Valves: -Incorrect valve adjustmentBurned or bent valve -Incorrect valve timingWeak valve spring Cylinder head:Leaking or damaged head gasketWarped or cracked cylinder head CylinderpistonWorn cylinder or piston ring High compression Excessive carbon build-up on piston crown or combustion chamber Excessive smoke Worn valve stem or valve guide Damaged stem seal Worn cylinder, piston or piston rings Improper installation of piston rings Scored or scratched piston or cylinder wall Excessive noise Incorrect valve adjustment Sticking valve or broken valve spring Worn or damaged push rod andor cam follwer Worn rocker arm andor shaft Rough idle Low cylinder compression Intake air leak Overheating Excessive carbon build-up on the piston hea9 or on combustion chamber Knocking or abnormal noise Worn piston and cylinder Excessive carbon build-up