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I just resurrected it, I believe that ski has has many fathers, lol. I took a ton of pics of the hull gutting and reinforcement. Those were T1 footholds FYI. Good luck with it buddy!

Look familiar?

Pretty sure that engine was a 760 from a couch with about 135-140 psi from start. Can't recall, but I know the ski. I put it together a few years back from all old spare beater parts as a backup/friend ski, it ran pretty well when I sold it. I've got a ton of pics of the hull build.

Bump

Buyer fell through

Like new Torrent 155 pump with Torrent HD shaft and assembled by Torrent. Bought it with a new cut back 6/12 impeller installed. This pump is still in like new condition with basically zero use. I installed it and ran it once in freshwater, for maybe 10 minutes. $3500 shipped in the US, will...

Well, I feel dumb as hell. It was compression. I installed the stock head (likely machined by sbt) and now I'm at 120psi across all three cylinders and my boat runs like a top. I can't thank you guys enough for the help.

Just looked into lower compression domes and looks like that's not an option. I am running 42cc domes currently and that's the biggest dome they sell (on their website anyway). Guess I'm looking for a a stock head/hardware now.

I think so.. I at least have pics. I'm out of town right now but I'll be home this evening and will post photos of the past damage as well as pull the head for current photos.

No, it has been bypassed and pickup has been pressure tested.

Fuel pressure is 2 psi idle and about 6 when I brap it open using a calibrated fuel pressure gauge right before the restriction. Man I never considered the octane at 150psi.. I'm running ethanol free 93 40:1 with klotz. Maybe I should have a go with 50/50 110/93. Thinking I need to find a stock...

Correct, using the pump from the gp1200 with a short shaft.

That makes sense.

I have, forgot to mention that. All cylinders around 125-130 degrees. It ran best with 100 pilot/145 main, stock is 135 main. I have 150 mains in there now because the plugs looked too white still. Now it runs like it's fat but plugs are still way too light looking. I agree on the load. I was...

Since then that filter has been replaced with a better one, not factory but not the paper filter. Fuel lines are setup like factory now minus the petcock, single feed. I didn't think about the 3 individual feeds, just figured it SHOULD work stock.

Old SBT engine was 130psi, I'm closer to 150psi now with a new ada head. Unfortunately I think I trashed the old head. I haven't gotten back into the electronics but everything was definitely installed just as it came apart. Maybe I need to investigate that. Doesn't seem like it's out of time...

Bump. Still trying to get this thing to run correctly. I've tried extra cooling, confirmed piston/cylinder clearance and dome squish, tried known good carbs from a well running gp1200, tried a different fuel pickup and tried a large range of jetting, compression test and did another leak-down...

Primeweld is legit, just picked up a 225x about a month ago. Awesome customer service, check out the primeweld equipment user group on Facebook. The guys that build the machine post on there very regularly and respond to any questions quick.

No, I run a mix of 110/93 just to be safe, I like to hold it WFO occasionally, haha.

Hi everyone! Picked up one of these 781 engines for my T1 build and I'm super stoked with it. Very impressed with the power for its size and you just can't beat Jetmaniac and Blue's service. I'm way out of practice so my setup wake timing needs work, but it'll pull this full length hull around...