I am running 39 fcr on my bike almost have it back together now, but I was just wondering all of you out there running big carbs is the stock petcock valve enough to cupply the big carbs with enough fuel? also what intakes are having the best succes with these carbs I would like to keep my air box if possible because of the area I live in and some of the wet conditions I ride.. also what about exhaust will the normal raptor 2 to 1 exhaust work with the bigger carbs do they need to be modified? my bike is now a 727 so would I get a good gain from switching my ct to a dual exhaust set up? thanks for the help guys

 

I would use a pingle(sp) dual outlet petcock on it if you plan on running wide open for any length of time. Craycraft sells one that retains the reserve, not all do.

 

I've been fine with the OEM petcock.

A good single will flow well, but duals will flow significantly better on a bike that is taking in that much air.

LTE duals if you wan inframe, Barker duals if you go out of frame.