1998-2001 Honda Fourtrax Foreman TRX450S, TRX450ES Factory Service Manual, Page 127Get this manual
CYLI NDER HEAD CYLINDERPISTON
Va lve guide drive, 5.5 Va lve guide reamer, 5.5 mm Va l,ve sp ri ng compressor Va llve set cutters Seat cutter, 35, mm (4.50 IN) Seat cutter, 29' mm(45 EX) Flat cuner, 35 mm IN) Flat cutloer, 30 mm (32 EX) Interim cutter37,5 mm IN) Interior cutter30 mm EX) Cutter halder, 5.5 mm
07742-00t0100 07984-2000001 or 07984-200000D (U .S.Aon ly) 01757'-0010000these are commercially availab le in U.S.A07780-0010400 07780-0010300 07780-0012300 07780"()0122oo 07780-001 4100 07781 0010101
TROUBLESHOOTIING,
Engi ne prob lems usually affect eog;lne performal1cr;tThese problem can be diaglnosed by compression test or by tracing engine noises to the top-end with sound ing rod stethoscopeIf the performance is poor at low speeds, check fo white smoke in the crankcase breather tubeIf the tube is smoky, check fo seized, piston ring
low compression
Incorrect vl lve adjustmentBurned or bent valve -I noorrect valve tlming!Weak varve spring Cyli er head:Leaki ng or damaged head gasketWa rped or cracked cylindier h, ad Cylinderp istonWorn cylinder or piston ring