I have been having some issues with my 40ci Intek V-twin for the past few week during ice racing. It will run great for 2 or 3 laps and then start cutting out at the end of the straightaway. It is almost like the ignition is completely but briefly getting shut off with it getting worse and worse the longer I run it. At first I thought it was a fueling issues because when I played with the choke it seem to stay running better. So I drilled out the jet. It did seem to run a bit better but still not cured. So I tried replacing the fuel filter because it looked a little dirty. Still no luck. Next I cleaned the carb and replaced the plugs still not completely fixed. I also reset the coil air gap to .046 with no change. My engine is stock except for governor removal, ARC flywheel, EC air intake, exhaust header, 49 rods and springs. I am running out of ideas on what could be wrong without starting the throw parts at it.