Originally Posted by
joeling
Hi guys,
I am a newbie to nitro & I have been running a GO 5 port for the last couple of months. Recently, I installed a turbo head button & was pretty happy with the increased power. However, I have run into a little tuning problem. After running for a while, the engine sputters & there's even a loud 'pop' from the exhaust. What could be the cause of this? I measured the head temperature & it was less than 100 deg C. On top of that, I am getting 'sticky throttle' in that the engine is slow to rev down. I know that without further details, it's not easy to figure out what is (are) the problem(s) based on this simple description. Some educated guess would be appreciated. I have just changed a new fuel tank & new tubing because I was getting the 'sticky throttle' earlier so I hope that potential area of concern is eliminated.
Regards,
Joe Ling
what fuel and plugs are you running Joe, and be sure the head bolts are tight and carb pinch bolt and back plate, my test 3 port did the same thing, i went through everything and used a P3 during breakin and sealed the pinch bolt and back plate, the head bolts where a bit losse and i think this is what caused it, are you using the extra shim, i put mine in after that, let me know.