2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 32Get this manual
ENGINE SPECIFICATIONS Item Carburetor IDmark Main jet Main air jet Jet needleclip position Cutaway Pilot air jet Pilot outlet Pilot jet Bypass Valve seat size Starter jet Float height Engine idle speed Intake vacuum Standard 5TG1 00 #158 1.0 NDSR4 1.5 #100 0.9 #42 1.0 3.8 #90 mm (0.31 in) 1,7501,850 rmin 34.737.3 kPa (260280 mmHg, 10.211.0 inHg)at 20 Paper Trochoid 0.070.12 mm (0.00280.0047 in) 0.090.17 mm (0.00350.0067 in) 40.080.0 kPa (300602 mmHg, 11.823.7 inHg)
(M.J) (M.A.J) (J.N) (C.A) (P.A.J.1) (P.O) (P.J) (B.P.1) (V.S) (G.S.1) (F.H)
Throttle position sensor Resistance Oil filter type Oil pump Oil pump type Inner-rotor-to-outer-rotor-tip clearance Outer-rotor-to-oil-pump-housing clearance Bypass valve setting pressure Cooling system Radiator core Width Height Depth Radiator cap opening pressure Radiator capacity Coolant reservoir Capacity From low to full level Water pump Type