your petcock should work in the prime poshion , many have changed to the raptor's petcock to get back the benefits of the reserve gas , seams to me there's a sticky on what can be done to the stocker petcock
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03 ltz400,95.5bore,+5crank,P&P,13.7:1,JE piston,spacer plate,RHC +1 intakes valves,RHC #208in&187ex cams,DRZ manual decomp,DID cam chain,no air box,Sredrum TB 42mm FCR,RAT stack,WB fuel screw,EMN needle,quick shot,06 clutch 450r drive plates w/trx400 ex springs,C2HB,ex thumber,trx450r air boot, Barker Performance pipe, trailteck flywheel,dynatek,nerf bars,450r shocks, nerf bars,+4 swinger,lowered front & rear
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