The pipe does make a huge difference. Some pipes match some engines, some don't. It's a trial and error thing.
That 0801 of yours sounds like it might be a fatal injury (if I'm picturing what you have described properly). The 0801 is a good pipe, but very fragile as you have found out.

Two options -
1. Bite the bullet and purchase a new GO EFRA 2072 for the 7 Port. If you thought the 0801 was good, wait till you ring it out with the 2072 on it.
2. If budget is a concern, get a Dynamite Platinum Series 053 Hard Anodised pipe. The 053 is very nice on the 7 Port. Strong and smooth right through the range.

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?

Here is a picture of my pipe. Sorry for the blurry picture, iphone!

Heres a video of the pinging sound when i rotate the flywheel. I just want to make sure this is ok. Everything looks fine inside the motor, in fact there are about 3 shims (2 copper, 1 aluminum) under the button head.

http://www.saukvalleynow.com/VIDEO1.mp4

who is the Texas distrubtor who do i contact

this should help u
http://www.go-engine-usa.com/index.php/dealer-list.html

i must say... im impressed.. what did you do run into a wall and squash half the buggy too??

bin it. buy a new one

Hmm - that sound is not normal. Have you removed the back plate and checked everything is rotating smoothly ? Sounds like the rod is hitting something ? Does it do it with the plug out ?
If it's still got pinch it will nip up tight at the top, but there should not be any metallic sounds like that.
I would strip it down and check everything out.

I think she is dead !! The walls are pretty thin, so I don't think it would be easy for anyone to weld or braze that back on - not without some pretty specialist gear. Get a 2072 and put that one down to experiance.

i have that ringing problem before, when the piston hits TDC and the culprit was the main bearing having too much play.

might just be a loose clutch bell. as they make a horrible sound??

The new 0801 pipe is much stronger than the old one.

Rex

Try doing a web search for a product called Aluma-Rod.
The the rod is easy to use and forms a strong weld too,
if you follow the instructions properly. I've used it to repair
a few pipes that were broken just like yours is. It also works
great for repairing the broken pressure nipples on THE O.S.
pipes. You can even polish the repair afterwards, if you want.

The old 0801 may be made of brass, not sure but it is softer than aluminum.

Rex

You may be right about the older pipes Rex.
I think they are made out of some kind of
seeklett taiwanese blass owlroy.