JT_Freeride
John Tetenes @Jtetenes
- Location
- Long Island
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Super Jet Detonation
- Thread starter Balduccimoto
- Start date
- Location
- NYC/Long Island
36cc domes were special order 2 week
BruceSki
Formerly Motoman25
- Location
- Long Island
Stupid question but You are running 760 domes right?
- Location
- NYC/Long Island
Yea
- Location
- Rexburg, ID
i had the same issue on my ss 850. ran good all summer then blew up. rebuilt it and it blew up again. My carb filters in the carb were plugged. cleaned everything out and rebuilt it AGAIN ugh and its been good ever since *knocks on wood*. I also cut my domes a tiny bit to lower compression to 180* and i run 50/50 vp 110 and 91 oct pump just for cheap insurance.
swannysxr
Site Supporter
- Location
- Lake orion, MI
Your squish is too tight, rule of thumb is .045"
- Location
- NYC/Long Island
Yea I know I put a .040" base gasket and cured that but ended up with a 4 point seize on the rear cylinder a few hours on the new top end. No sign of deto this time, piston wash looked good. I ended up buying a new ski.. I bought a full stock driveline to drop in this hull. I'm furious after this season to say the least. Same sleeve dropped twice on old motor, a melted piston and a seized piston. Big bore isn't happening anytime soon.
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waxhead
wannabe backflipper
- Location
- gold coast
Your not getting rid of the heat fast enough that's why it did a 4 point seize. opening up your squish that much lowered the thermal efficiency of your ski and will mask the issue that your engine was suffering from.
BruceSki
Formerly Motoman25
- Location
- Long Island
Don't worry he solved it. Buy a new ski and sell everything. Easy fix$$$$
- Location
- NYC/Long Island
Yep, im loving the new ski too. The kawi motor makes nice power, actually not too shabby off idle. Going to play a little with the pump nozzle/cone and then maybe play with dropping the cylinder over the Winter just to see. No rush though, im enjoying the no hassle limited set up.
BruceSki
Formerly Motoman25
- Location
- Long Island
Don't mess with it if you want it to run. Haven't you learned your lesson yet? Lol
Vumad
Super Hero, with a cape!
- Location
- St. Pete, FL
Do you have pictures of the waterbox inside? I've looked online and can't find anything of the baffles. I looked into my RN waterbox and only see 2 3/8" holes on the bottom. I can't see anything on the top, or at least the baffle looks solid up there. I'm using a flashlight and a mirror on the outlet side so I am of course a bit limited on what I can see in there. Looks like there is only the one baffle plate too.
Quote, tag me or PM me if you post a picture so I don't miss it please.
- Location
- NYC/Long Island
It's been a while since I had that waterbox apart. It definitely is only one baffle plate. I remember 2 small holes on the top and a even smaller hole on the bottom in direct path of exhaust flow. I did open up a hole or two and had it welded back together. The ski sounded great, it sounded throaty.
cookn
Kamikaze
- Location
- where you live
Just a question out of curiosity, because I plan to build a big bore this winter but was anyone running custom cut domes to make up for the extra cc. Correct me if I am wrong but if you ran 760 domes on 771 would that not put your very outer squish band at a crazy tight tolerance causing the detonation?
BruceSki
Formerly Motoman25
- Location
- Long Island
Yes mine were custom cut on my 771. Whatever jetworks supplied. I don't even remember the cc