2008 Yamaha Raptor 250SE / 250SE2 Factory Service Manual, Page 32Get this manual
ENGINE SPECIFICATIONS Item Carburetor IDmark Main jet (M.J) Main air jet (M.A.J) Jet needle (J.N) Needle jet (N.J) Pilot air jet (P.A.J.1) Pilot air jet (P.A.J.2) Pilot outlet (P.O) Pilot jet (P.J) Bypass (B.P.1) Bypass (B.P.2) Bypass (B.P.3) Valve seat size (V.S) Starter jet (G.S.1) Starter jet (G.S.2) Throttle valve size (THV) Float height (F.H) Oil filter type Oil pump Oil pump type Inner-rotor-to-outer-rotor-tip clearance Standard 4D31 00 #133.8 #140 5DH66-1 P-0M #85 #170 0.9 #25 0.8 0.8 0.8 2.0 #55 #0.5 #100 13.0 mm (0.51 in) Wire mesh Trochoid 0.15 mm (0.0059 in)