I'm using 20/20 fuel, KB RC plug with idler bar, 10x6 APC, and Macs header and pipe. The engine starts and winds up to just over 15000 rpm, so the pipe length must be close. After 5-10 seconds (without adjusting needle), it starts to stutter and lose power, then fuel starts spitting from the carb until it eventually dies. After allowing it to cool off a few minutes, it starts easily, but the same symptoms repeat again. What am I doing wrong?

Doug

The pipe is effecting the operation of the regulator. Take it off and try running it. Let me know what happens.

Took the pipe off and ran straight header pipe. Got a little over 14K rpm. Same results, ran for a 20-30 seconds or so before flooding. In flight, it would run an extra minute at full throttle, but would die when throttle was backed out. I think I noticed a fuel leak from the front main bearing, so maybe it's sucking air there. Might need a rebuild.

Doug

Sounds like it needs some help. Maybe you should send it in for a checkup.

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