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  1. #1

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    big bore 951 fuel question.

    Can you run a 1050 on pump gas?


  2. #2
    WICKEDSEADOO's Avatar
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    yes with right domes.

  3. #3

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    which ones would they be

  4. #4

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    Instead of installing new liners so you can punch out to 92mm, here is an option that will get you there most of the way without the compromises. First lets do the simple math thing. Stock bore is 88mm with 78.2mm stroke. With simple math 88 X 88 X .7854 X 78.2 X 2 = 951.2cc. So if you go the big bore then 92 X 92 X .7854 X 78.2 X 2 = 1039.6cc. Not all the way to a real 1050 is it? But a 1050 sounds better than 1039 any day of the week. Another thing to consider is the pistons are about $250 each. OUCH! Now with readily available oversize pistons that are same price as standard bore we can go another route. The largest oversize that are not Wiseco go up to 89.5mm. Readily available everywhere and inexpensive. So now 89.5 X 89.5 X .7854 X 78.2 X 2 = 983.9. So we can round this off to 984 and none the wiser. But to add some intrigue we need to embellish a little and call it a 1000cc motor. Sounds good enough. So now we are up to 1000cc's and not having to deal with the extensive machine work and cost to get it to 1050cc. You can have a lot more torque, almost a stump puller with the right additions to the package and not have a potential grenade lurking in the future. With this setup, you get part of the advantage of big bore with out having head gasket issues, custom cut domes for aftermarket head, loose rattling pistons when engine is first started up, really thin liners, and a very expensive initial cost. You decide for yourself. This option I have suggested can use all original parts with some minor machine work needed for proper squish clearance. All other standard mods and upgrades can also apply. Very pump gas friendly too.


    Or you could go with the 1125 stroker from Mel Miller. But you might want to be sitting down when he hands you the bill...
    Last edited by Seadoo timebomb; 09-13-2012 at 02:11 PM.

  5. #5
    m schmidt's Avatar
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    Or you could go with the 1125 stroker from Mel Miller. But you might want to be sitting down when he hands you the bill...[/QUOTE]

    Or go even bigger. And forget the pump gas. And be sure you watch the fuel pressure also.

  6. #6

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    This is not for my ski. I have a yamaha. My boss is running a 99 seadoo xp and wants to be able to keep up. He has found someone that will do a big bore for 1400 and rebuild his carbs. The motor already needs rebuilding because it burnt a hole in one of the pistons. I told him there are a few things he needs to make sure of before he get it.

  7. #7
    Man i would think twice about all those mods unless there is exce$$ bucks in the till. xps are great and will last forever stock. mod 951s a lot and they start to go boom. he could do some much less drastic mods and come out with a pretty good ski that does not lose reliability.

  8. #8
    which Yama is he having trouble keeping up with ? the top end of a good xp is about 65 mph.

  9. #9

    big bore 951 fuel question.

    Not to hijack but would I run into jetting issues if I did a 1.5mm over bore piston kit in an otherwise stock 951?

  10. #10

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    Quote Originally Posted by strokersquid View Post
    which Yama is he having trouble keeping up with ? the top end of a good xp is about 65 mph.
    I have a gp1200r and one of our friends has a ultra 150 that he can not keep up with. If i can ever get it running right it should be doing about 70. The guy that is building the motor for his says he should only run about 65 after it is done and he says it will be running about 150 psi heads. Is that right I thought it would be doing about 70. I also thought top speed on the xp was about 57-58 from the factory?

    And when I say keep up I basically mean on the top end. We just start to pull away but from the start it is right there

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