My superjet has decided it does not like the protec pipe mounted to it for years

[bored&stroked]

Over this past winter I rebuilt my ski. Went from 82mm to 84mm and ported it. Also raised compression and got rid of MSD enhancer that went bad and went to protec modded stock coil, although that shouldn't matter. I also got new inserts and coupler for the protec pipe, and had to switch to a round nose aftermarket waterbox after my fiberglass one blew out from the bad MSD. I had run the previous combo for 3yrs. This year, I can't make it a full day without snapping a mounting bolt. Pipe had mounting tabs on top and side- top mount doesn't work with my oem head so I cut that biotch off, 3yrs ago, and only ran the 2 bolt side tab bolted to the exhaust manifold. Worked great until this season. So I opened the holes in the bracket slightly and ran larger 3/8" grade 8 bolts. Snapped those too. Not sure why all a sudden, any ideas? Don't really have $800 for a new B pipe, and stock ain't gonna cut it.

 

[vomitspot]

slo-tec pipe needs all of the mounts or will break the bolts
your last 3 years you were just lucky

 

[mthomps]

I think @vomitspots right. You were lucky.

You can only run one head mount with the stock head on the protec pipe (the black one).

On my 650 motor it lined up and i had good power and it never came loose. When i switched to a ported 701 the other hole lined up better so i used that. Barley got the chamber mounted. Every ride i had hardware in the bilge and an exhaust leak.

I am no expert but i think there must be a slight difference in alignment with a 650 to a 701 and the pipe cant take it.

Protec jetted my 650 install and it was great. Then i got a bored nozzle and a prop from jetworks and the low end on that set up was crisper than a stock propped 701

I got tired of it falling apart so now i am trying to tune again with a b pipe

 

[bored&stroked]

As you can see from my pic, even if I weld the top tab back on it does not line up with the head to mount it. I realized while the holes in the bracket for the exhaust manifold were only 5/16", the inserts for the pipe were 3/8" so I drilled the exhaust bracket holes bigger and went to 3/8". Made it threw the entire day, so maybe this will work out again.

 

[mthomps]

Best of luck to ya buddy. Let us know if it works out. Id still be running mine if i could have figured out how to make it stay in place.

 

[bored&stroked]

Let us know if it works out.

Well, after drilling out the bracket attached to the manifold for 3/8" grade 8 bolts, and getting a 2.5" long one for the top hole so no threaded area is where the brackets meet to shear, I've stopped breaking bolts. Made it threw at least 10 tanks of gas now, was only getting a half tank at most in the beginning of the season. Woohoo!