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  1. 2013 yamaha fzs midshaft housing removal from jet ski help

    Hey guys so I have a quick question on removal of the midshaft bearing from the jet ski hull. Ive already searched the forums and its only people talking about removing the shaft from the actual...
  2. Re: I need seadoo performance parts, 580 model

    Right now for mods I have dual mikuni 40i's, rossier head at 155 psi (basically stock) Coffman pipe, lightweight flywheel, mild port on the cylinders and exhaust, bored to 600cc, I did some home...
  3. Re: I need seadoo performance parts, 580 model

    How much h for the pipe and head
  4. Re: I need seadoo performance parts, 580 model

    What compression psi of the Westcoast head? Pics of the rossier pipe?
  5. I need seadoo performance parts, 580 model

    I need a rev limiter, preferably aftermarket like psi, for my seadoo 580. It's an 89 model so the old school wiring setup. If anyone has a good one let me know I'll buy it. My current psi rev...
  6. Re: 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    Alright..I know this is an old thread BUT this jet ski build is still very much active. So long story short summer of 2020 the exhaust manifolds cracked and failed so I decided to go back to stock...
  7. Re: 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    Got it up to 42mph but the ski was Porpoising so bad i really couldnt go much faster. I will be adding an extended rode plate to help with this. Only had at 3/4 throttle and the ski is still...
  8. Re: 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    I also went ahead and put a 159 degree rotary valve in it instead of the 140-something I initially wanted.
  9. Re: 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    I know this thread is a little old but I wanted to update everyone real quick. So as you can imagine things got pretty busy for me and I can only work on the weekends for projects so i was unable to...
  10. Re: 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    None so far.

    Question though, is water supposed to go through the whole exhaust including the muffler? My decker pipe has 2 hose barbs, one that comes off the manifold and one smaller one that...
  11. Re: 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    Finally got my jet ski out on the lake today and was really impressed with the handling an acceleration! Low end was really good for this ski. At least alot better than what i was expecting. Was...
  12. Re: 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    Quick update, the rogo cylinder head i was using could not make a good seal at all so i went ahead and order a stock skidoo head. It HOPEFULLY should be done this weekend...everything else is great...
  13. Re: 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    Get a pair of skidoo cylinders. Those are going to be way better than the seadoo ones. Will need extra modding but they are worth it
  14. Re: 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    Well.. my starter relay went out (least I think) So i have to to order that. ..will update next weekend :(
  15. Re: 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    Well Ill be honest I have never driven these and was only looking at online "specs" Which said this ski stock back in 89' was 40mph. I have read alot of people saying they where going 50 in a 720 so...
  16. Re: 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    60mph is my goal for this build
  17. Re: 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    So here is the almost finished product. I will be getting the manifold ceramic coated inside and out as a water jacket is too difficult for me. Rogo head on there as well if anybody is wondering.
    ...
  18. Re: 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    well Ill have to see what I can do to prevent the stainless steel from cracking..
  19. Re: 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    So long story short im just trying to max out this ski as much as possible.

    But on a side note..there is a psi pipe i can get, are those better for PEAK hp??
  20. Re: 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    By chance do you remember what your top speed was for the jet ski? I just found out today that my seadoo has a PSI rev limiter in there, not sure what they top out at but i would assume 7500 rpm. ...
  21. Re: 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    Will be posting the finishing build later this week. had a few delays but the engine is all assembled, just need to get the custom manifold made to mount the seadoo decker pipe.

    Hopefully the...
  22. Re: 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    Cylinders are installed. I ended up shaving the piston skirts down as I got tired of messing with the cases. the connecting rod does fit the skidoo pistons fine and the cylinders line up with the...
  23. Re: 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    I also forgot to mention I will be adding a 159 degree rotary valve
  24. 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    Doing a full build on my seadoo 587 and I will be swapping parts from a skidoo 587. The skidoos had 100hp so I am shooting for 85hp as there is a slight difference in the cylinder which I will show...
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