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Ok dope, thanks for checking on that. Do you happen to know a good source for jets? And couldve been mx bars but the bends didnt seem quite right. Goofy af no matter what they are.

I've come across quite a few people saying the same thing. It has AM flame arrestors on it so I'm guessing I'll have to lower the popoff from where it is now. It was a crude gauge I measured with but theyre popping somewhere around 30psi and damn near perfectly evenly. Its jetted at 45, 72...

Ended up scooping the 750 swap, don't have it running right yet. but its had a few moments where it really pulls. Its a 750sp from an ss-xi as best I can tell. Dual 3 jet CDK's, a coffman pipe from a 650, stainless prop of unknown pitch, but seems pretty well suited to the powerplant. Also...

Finally put my spare cylinder in the blaster and got it cleaned up. Wish I took a before picture because of how crusty it was, but its squeaky clean now. Started cleaning up the mouth of the transfer ports and getting the boogers out. Going to raise the exhaust ports a couple millimeters...

Ahh good call on the fly cutter, that'll do the trick, cheaply. I should be able to just T bolt the nozzle onto my table, but a fixture for the vice is really doable if not. Thanks for the suggestions. There's a 750 swapped 550 "near" me and the guy says he'll do $1500 but I think he'll...

I shouldve been a little more specific, I have a very beefy drill press with a milling table and vise installed and I'm by no means a machinist. Any thoughts on how you would do it on my "mill"? And I just checked my emails and I bought 4.50" OD with .125" wall for 4.25" ID. There's maybe...

After four years I finally caught the covid so time for a long post... The reduction nozzle boring is definitely on the list, I also got a spare stator for my 550 pump that I'm going to rebuild and blueprint because I'm missing some chunks of stator vanes on the installed one. I restore cars...

Just scrolled through everything. Very nice work! Should be a real looker and ripper.

Still have all both of my thumbs too ;)

Put the Jetsport pipe and OCJS manifold on the 550 and wow what a difference. I cleaned up the stock impeller too and it did 35. Its running much better all around. Scooped a BN44 and a mariner manifold for it and looking like I'll have a 15.5* impeller for it too. Should hopefully keep up...

Good times and crazy good exercise. Also having fun making all the tools

Crazy how dead this forum is but, I bought a 440 a couple weeks back, kerker header and pipe, the blowby was horrible when I first took it out but runs really well. Stock impeller was chewed all to poop, definitely quite a few large rocks went through it. Filed it best I could with it still...

So I scooped a Jetsport 440 pipe, looks to be a west coast copy. Probably paid too much but its in great shape and I wanted it. Also have an ocjs exhaust manifold on the way. I ended up just making a quick steer plate to add on to the stock setup, dremeled the steering nozzle a little bit...

Hey everyone, I'm sure this has been covered but I haven't had any luck searching for it. Had an 83 JS550 and a JS300 hull fall into my lap. The 550 is pretty much 100% stock and complete and the 300 hull is minty fresh. I want to get some more performance out of the 550 but not trying to...