2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 11Get this manual
GENERAL INFORMATION ENGINE ITEM Cylinder arrangement Bore and stroke Displacement Compression ratio Valve train Intake valve opens at mm (0.04 in) lift Intake valve closes at mm (0.04 in) lift Exhaust valve opens at mm (0.04 in) lift Exhaust valve closes at mm (0.04 in) lift Lubrication system Oil pump type Cooling system Air filtration Engine dry weight TRX450ER TRX450R Carburetor type Venturi diameter Clutch system Clutch operation system Transmission Primary reduction Final reduction Gearratio 1st 2nd 3rd 4th 5th Gearshift pattern Ignition system Starting system Charging system Regulatorrectifier Lighting system
SPECIFICATIONS
Single cylinder, transversely installed 96.0x62.1 mm (3.78x2.44 in) 449.4 cm3 (27.42 cu-in) 12.0:1 Chain drive and OHC with rocker arm 10 BTDC 40 ABDC 40 BBDC 10 ATDC Forced pressure (wet sump) Trochoid Liquid cooled Oiled urethanefoam 34.3 kg (75.6 lbs) 33.4 kg (73.6 lbs) Piston valve 40 mm (1.6 in) Multi-plate, wet Cable operated Constant mesh, 5-speed 2.739 (6323) 2.923(3813) 2.230(2913) 1.785(2514) 1.437(2316) 1.181 (2622) 0.962 (2627) Left foot operated return system, 1-N-2-3-4-5 AC-CDI Electric starter motor (TRX450ER) Kickstarter (TRX450R) Triple phase output alternator Triple phase full wave rectification Battery (TRX450ER) 12 DC output (TRX450R)