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  1. #1
    MPower's Avatar
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    Input on Superstock motor setup - Carbs, Pipe, RPM??

    So I am putting a superstock motor in the 95 XP800 I am restoring. I'm getting and seeing some pretty conflicting information on what I should and can safely run on 93 pump gas.

    I've been told that anything over 7100'ish RPM will require race gas. Essentially ruling out an aftermarket pipe because most of them need to be ideally run around 7300 RPM. But I know dang well tons of guys aren't running race gas with these pipes.

    While on pipes. Thoughts with running a stock pipe on a superstock motor?

    Then carbs. 40's to 46's...lots of debate on this. With stock pipe is there any benefit of running bigger than 40's? My intake manifold is bored to 42.5 and tapered bored down to I THINK 39 or 40 at the cases.

    So for the gurus, on a superstock motor, what carb size, pipe, and RPM's are proven setups on 93 pump gas?


  2. #2
    "Tearing it up on the water" seadoobutch787's Avatar
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    If you can afford to build a SS motor you can afford the $6.00 a gallon for 110. I have a 96xp that has everything but porting and i run about 7450 hot rpms. I wouldn't even consider running anything but 110.

  3. #3
    MPower's Avatar
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    Well its not a money issue. It's going to be a recreational ski so I want to run pump gas. I have experience with ported GPR motors and they operate very well on pump gas and stock pipe. I know very little about ported 787's however. Looking for input on suitable pump gas setups, if there even is one.

    For instance, is it worth while to run a ported 787 with say 180psi head, 42/44mm carbs, and stock pipe? in the 7100-7200 RPM range?

  4. #4
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    bump

  5. #5

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    I've run spec 2 factory pipe,44 red tops 170 psi head and spinning 7260 no problem on pump fuel 40-1 premix stock ignition system with micro touch rpm box,if you what to add 25% fuel to make you feel warm and fuzz,go

    chip de pcb

  6. #6
    MPower's Avatar
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    chip,

    how bout stock pipe and carbs 180 psi head on 93 octane? i know i want see the max benefit of the ss motor but that is ok as long as the gains are still noticeable

  7. #7
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    Sounds like you want 2 different things, you can't have both. You can either have a Superstock motor with all the goodies that runs on high octane fuel, OR you can have a recreational cruiser with a stock pipe. For an excellent running 787 running on 92 octane I would get a Rossier pipe, some sort of aftermarket f/a setup, Jet the stock carbs, mill the stock head a wee bit and get a solas or skat impeller. It will make a huge difference.

  8. #8
    My fully ported SS has annular discharge 46mm carbs, a Neptune pipe and only 33mm domes in the head. Good race fuel is a must!

    I have a Neptune piped rec ski and a Rossier piped rec ski. Both have 43cc domes in their heads and 44mm carbs. I run about 7200ish rpm on each with 93 octane pump gas.....no problems so far. My egt's do run a full 1100 degrees though and some say thats a little hot, time will tell.

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