I'm going to revive this thread a little bit, Jerry do you think a pro-x 310 with ESR 9 porting, running a trx11 pipe would create a possibility of this overheating condition?
I do not think that the 310 with ESR 9 porting will make enough power to need the 1 1/4 OD 18 gage stinger and silencer. If you start hurting pistons with that pipe and porting combination you probably have one of the pipes that was quickly and carelessly welded together.
Look inside of your head pipe and inside the start of the main pipe body for weld boogers where they had the wire feed welder turned up to hot and burned all of the way through the pipe when they were tacking the pipe together. Look at the inside of the pipe where the seams are welded together for places where they really had the heat to high and burned through leaving big boogers. If you see weld boogers in either of these two aforementioned areas, there is a very high probability that you also have boogers at the critical junction of the tail cone and stinger.
