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  1. Re: Need a spare hull in the I.E. or high desert

    I have a 1986 js 550 hull, with the pole and the hood. It is in great condition. I have it stored in my garage in blythe. im in orange county, but i do plan on going there soon. what would you give...
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    Re: ISO this style 550 pipe.

    I would replace that Lock-Tab washer on the crank/flywheel. Hate to see you turn that motor into a basket case if it worked its way loose.
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    884

    Re: 88 JS550 Start before rebuild?

    Once you get it running, a few quick easy mods will help your ski run like it was meant too. (1)- advance the timing all the way (32 degrees). (2)- Plug the rev-limiter and install a restrictor jet...
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    73,957

    Re: Project HX

    I can tell you that Tommy Bonacci's blaster is completely legal. I helped build it. Tommy is my younger brother, and just a really good rider. He is super nice off the track, but on the race coarse...
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    Re: JS550 bottom end opinions?

    That looks pretty bad. Who ever built that low end should have never used red silicone. I personally wouldn't run any of those parts except for the cases.
  6. Re: Early 440 ebox with later 550 stator?

    Yea i think i have ran that set-up before on someones ski. I'm sure it worked out for the guy i did it for.
  7. Re: Congrats to Tommy Bonacci 2014 Sport Spec World Champ1

    i had my hands in on that build. Thanks for noticing.
  8. Re: Tommy Bonacci's Bullet Pre-X4 Factory Racer

    Hey Matt, maybe just lay the stuff out and take a few pictures of what i sent you. I know it would be kind of hard to explain what was in the package. A photo is worth a 1000 words, so they say. lol
  9. Re: Tommy Bonacci's Bullet Pre-X4 Factory Racer

    I'm glad to help you out, keep us posted on the progress of your build.
  10. Re: Tommy Bonacci's Bullet Pre-X4 Factory Racer

    Hey Matt, did you get the package i mailed out to you?
  11. Re: Tommy Bonacci's Bullet Pre-X4 Factory Racer

    i know this is a old thread, but if you are still looking for info on that ski, i have all kinds of magazine write ups and photos. I even have the Bonacci stickers made for only the factory racers....
  12. Replies
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    780

    Re: waterbox sealing

    Sorry for the late reply...you can t-off from the front of the head into the tail end of the exhaust pipe.
  13. Replies
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    583

    Re: js440 flywheel/timing question

    Just line up the notched line on the stator plate with the with the cases where they come together. If you decide to advance the timing, i think 32 degrees is as much as it will go. On the older js...
  14. Replies
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    780

    Re: waterbox sealing

    I know this response is a little late to your post, but you can try diverting more water into the exhaust to make it a little less noisy. (still using the westcoast water box) If you choose to repair...
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    1,245

    Re: Need help tuning my 550 carb

    Other mods to consider would be>>>milling the head, K&N air cleaner and a stainless steel prop (16 degree pitch).
  16. Replies
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    1,245

    Re: Need help tuning my 550 carb

    Yea that is a good starting point for tuning. You really do need to pull your flywheel off and have the timing advanced. It makes a huge difference in performance and easier starting.
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    1,245

    Re: Need help tuning my 550 carb

    Oh did you mean you have no idea about your timing being advanced?
  18. Replies
    11
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    1,245

    Re: Need help tuning my 550 carb

    Just use a small screwdriver and turn them clockwise until it stops, then back them out 1 and 1/4 turns.
  19. Replies
    11
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    1,245

    Re: Need help tuning my 550 carb

    dont mess with the idle, just the low and the high speed ones. I also was wondering if your timing is advanced? if not, it should be advanced all the way. Which ends up being 32 degrees.
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    1,245

    Re: Need help tuning my 550 carb

    dont mess with the idle, just the low and the high speed ones.
  21. Replies
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    1,245

    Re: Need help tuning my 550 carb

    set the air fuel mixture screws at 1 and a 1/4 turns out. That would be a good starting point.
  22. Re: Photos - Jettribe West Coast Series Round #6

    That is my brother #201 AKA the Bomber.....great shot Greg.
  23. Replies
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    27,615

    Re: Rebuilt Engines from Seadoo Engine Shop

    I have worked at a watercraft shop back in the early 90's, and Bill O'neal was right next to me. I can honestly say he is a top notch Sea Doo mechanic. He is also a good person. He has been to our...
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    Re: Js550 pump impeller questions

    If you decide to install the 440 pump you will need to install the complete 440 driveline!
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    506

    Re: Js550 stop switch

    You can set up the motor with no idle, then you wont need a switch. 2 strokes are better off with no idle because it forces the rider to blip the motor creating better lubrication for the motor.
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    Re: Vintage Race replica graphics

    Look at my profile photo---the kit on it was made by Z-1 graphics (my older brother Larry was the owner of Z-1) Those kits are very close in design to a PJS ski. I still have about 6 or 7 kits in my...
  27. Re: Hey i got a super clean 86 js-550 for sale...take a look.

    I just spoke to the owner of the ski, she said she would take $ 600 for it. My camera is taking some pretty hazy photos, but i will try and get some better shot up soon with a different camera. This...
  28. Hey i got a super clean 86 js-550 for sale...take a look.

    This ski is a girl friend of mine and im helping her sale it. Its been in storage since 1989, Its has a milled head and Mariner ride plate, handle pole spring and advanced timing. This thing still...
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    Re: Js 550 exhaust hose routing

    Ties into the front of the head.
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    Re: Exhaust pipe

    looks like a old coffman pipe.
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    Re: 440js question!!

    My guess is a stator, but i would check the other options first, just to make sure you dont by a stator for no reason because they are not cheap. Your symptoms do sound like a stator going bad.
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    Re: trued and welded crank?

    Mr Ski is right. If you can get it with in .0005 then thats pretty darn good. I too have seen new cranks way out of wack. And i do like the comment tig it don't mig it!
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    Re: Everything look good?

    You can hone the cylinder lightly and mill your head to raise the compression if you are looking to spend less money.
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    459

    Re: 550 tuning help needed badly

    Try a 2.0 needle and seats, with the pop off pressure set at around 8 pounds, air fuel mixture screws can be set around 1 to 1 1/4 turns out would be a good place to start.
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    Re: trued and welded crank?

    It keeps the front of the crank from spreading apart at the pin. I personaly am not a fan of welding that pin, only because you are putting alot of heat on those near by needle bearings.
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    Re: 550 Doesn't like water

    Might be a stator, under a load (in the water) they just dont provide enough spark to burn all the fuel. On the stand (not under a load) they sometimes can run okay.
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    Re: crank seal question

    1211 is for the cases not the crank seals. I like to use a double lip seal for the front one, those heavy flywheels tend to be hard on the front seal. And always put grease on the inside of the...
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    Re: head gasket question?

    Run the green one, it should put your compression right around 180-185 with the Mariner head.
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    Re: Modding, how much jet increase?

    The post above mine makes a good point. ( pop off pressure should be set at around 7-9 pounds ) You also may have leaky crank seals or base / intake gaskets. All three can cause idle problems. And...
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    Re: Bad Bones reeds... anybody run them?

    Those reeds were made by Steve Dobernick, He is a good well known engine builder in the motorcycle industry. I remember him comming into the shop I worked at ( Cal Ski Tech in glendora) and...
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    Re: 550 Cooling Question

    If you have good water flow comming in thru the pump to the motor, then the cooling is most likely not the problem. If your exhaust hoses and waterlines comming off the front of the head are not...
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    Re: need performance parts for Js550

    Plug the rev limiter line, install a restrictor jet into the return fuel line. Advance the timing all the way ( 32 degrees advanced ) and mill the head at least 50 thous. These three low cost mods...
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    Re: 550 question

    I would'nt bore the cylinder anything past 1st over. Those piston ports like to get hot and sieze when you start boring 2nd over.
  44. Replies
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    884

    Re: FMF reeds...quality?

    Uncle Donny at FMF makes great aftermarket products. Buy the reeds they do make a noticeable change in performance.
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    Re: help!! js 550

    Advance the timing, plug the rev-limiter line and install a restrictor jet into the fuel return line. Mill the head, K-N air filter +adapter. Trigger throttle. And everything that PrickofMisery...
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