As for air leaks, just replace your fuel line if you're worried about it. And you got to tune it with the engine at running temps. It takes a bit to get it up that high. Like the 3 or 4 minutes you say. That's what you need to tune the motor for, that stage of running. Then start it up early and warm it up by using your finger on the servo if you have to.
To test the tank, take it out first. Put fuel lines on both the pickup and exhaust hole. Put it in sink full of water. Plug the carb line, and blow into the pressure line. If it bubbles it's got a leak.
Air leaks from the motor will make you have to retune all the time, and the temps will fluctuate all over the place.
Most common leaks on the motor are at the backplate, under the carb, and around the banjo fitting (fuel nipple). You can take all those off and put some orange rtr (sensor safe) on those parts. It works wonders for sealing motors. Just a small amount is all it takes.
If your high end stays the same and your temps don't spike you probably don't have an air leak. More likely you just need to tune the motor when it's warmed up.
Last edited by jbrow1; 05-07-2005 at 09:15 PM.