I got a good deal on ebay for 3 go engines, 2 7 port and 1 3 port. One 7 port was brand new, and the other 2 are used. The 3 port has no residue in on the piston and glow plug button, the used 7 port has alot of residue. I threw the 7 port on my 8ight 2.0 and got to run it for the first time last night. Both of the used engines have good pinch the 3 port has just alittle more than the 7 port.

Anyhow this was the first time i've run a nitro buggy. I couldn't believe how fast that thing was. It was damn near uncontrollable. It took a few tanks until i got a good handle on it, but it absolutely flies. I'm really impressed and can't wait to try the 3 port out. I need to grab another clutch bell to put on the 3 port. I couldn't imagine any more bottom end power and top end speed. As it is at the moment, its almost overpowering. I don't see a need for any more horsepower, these engines are amazing.

My only concern is the 3 port has a ringing sound when i rotate the flywheel and it hits tdc, but i think that might be due to its compression and not so much of it hitting anything. Should it sound like that? The 7 port doesn't but then again it doesn't have quite as much pinch. Is there anyway i can test to make sure the piston is not hitting the glow plug or button head?