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  1. #1
    waseemyah's Avatar
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    3 questions about Yamaha Superjet !!

    hi all, I have a GP800R 2005 and I have 3 questions,
    1- I need to know the size of its carbs, I read before somewhere that they are 44's if so... 2- can I use them in my SuperJet 2009? 3- if they fit the SJ, how much power increase can I expect, I mean after all, is it worth it? thanks for your help.
    P.S. I know that the Superjet carbs are 38's
    SJ mods: ADA 35's domes, V-force reeds, MSD enhancer, riva flame arrestor


  2. #2
    Myself's Avatar
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    Yes they are 44's. You'd be better off with a set off a 760 . Your 38's if prepped properly will be all you need for that engine. Add some porting and a B-pipe and then you would see a big increase in power going to the 44's. For example, I have a Seadoo HX with the 717 Rotax in it. I massaged the cases and intake a little, did a mild port job, put a Rossier pipe on it, and a Westcoast plenum style flame arrestor. I'm still running the stock 38i carbs with proper jetting and it rips. I'm guessing I'm right around 95hp.

  3. #3
    waseemyah's Avatar
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    ok, so you mean with my mods and adding those 44's I wont feel a big difference in the power gain? is that right? thx for your help.

  4. #4

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    You should not use those carbs from the 800, they are sidedraft carbs and not designed to be mounted vertically. Besides, the 44's will use a lot more fuel for a little more power. Take a look at www.groupK.com for more info on superjets and carb choices.

  5. #5
    Myself's Avatar
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    Actually, you can mount these style carbs any way you wish since there is no float bowl. But, what you said above is what I'm saying. No huge gain to be found only an increase in fuel consumption. If you really want to make a difference, take off the cylinders and clean up the horrible oem port matchup and mill about .020 off the head.

  6. #6
    waseemyah's Avatar
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    ok, got it, thanks for your help guys

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