Looking for high hp, low weight 500cc engine

Discussion in 'Some Assembly Required' started by anonny, Dec 18, 2011.

  1. anonny

    anonny What could go wrong?

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    I got a sled, I want more hp in this, it's a riot to ride! Clutch placement with a sled motor on one of these would be a huge hurdle.
    #21
  2. davesupreme

    davesupreme grand poobah

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    say someone was interested in this.... how much $$$$ you thinkin'?...... and is it in the U.S.?..... :deal
    #22
  3. LukasM

    LukasM Long timer

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    Don't want to highjack this thread, I will PM you with all the info when it's ready.
    #23
  4. anonny

    anonny What could go wrong?

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    Please PM me as well :D or go ahead and hijack away :evil
    #24
  5. Billtr96sn

    Billtr96sn Flange Furtler

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    #25
  6. sailah

    sailah Lampin' it

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    I've got a freshly bored CR500 motor. I can't think of a motor with more power for the weight. I broke the inner clutch basket trying to torque the nut and moth balled it. It's been sitting in my garage for a couple years, was goingin a yz450 chassis.

    As Kramer says, "Interesting trades considered":deal
    #26
  7. Pete-NZ

    Pete-NZ Long timer

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    The Godden is long gone... were a ok motor but weren't quite there..
    A GM is the motor

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    #27
  8. slackmeyer

    slackmeyer Don't mean sheeit. .

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    Why limit yourself to 500 and two cylinders? 600cc and 4 is much more available, and you get lots of reliable power. Seriously, you're probably better off weight wise than you would be with an ex-500, width doesn't matter much with your rear track like it is. The 500cc limit seems kind of arbitrary- weight, power, and size should be the factors, and they don't necessarily relate to displacement.
    #28
  9. Bobthebiker

    Bobthebiker not normal

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    for the criteria, a 2 stroke liquid cooled engine is your most likely bet. other than that, you're simply not going to make 70+hp RELIABLY from an EX500.

    the ninja 650 motor has the potential for it though.
    #29
  10. anonny

    anonny What could go wrong?

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    While I certainly agree with the first statement it limits me to mainly sled motors, so now I need you lads to help me work out clutching :evil

    Someone has already gone the 750 GSXR in a dirtbike frame and claimed the extra weight was not worth the HP gain, so the 650 Ninja motor would probably fit that category.
    #30
  11. BRE

    BRE Been here awhile Supporter

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    A reed valve/exhaust valve 500 cc Polaris snow engine will give you around 90 horse. Using the snow clutches would make it easier to drive. You will always be in the right gear and have peak torque when ever you need it. Yes it would take some clutch tuning, but that is fun. Think of the cool looking pipe you could build for it!
    #31
  12. anonny

    anonny What could go wrong?

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    Your idea is valid except mounting the secondary clutch (I think thats what they call them) The secondarily would be right where your leg should be :huh

    A sleds ability to run backwards would also be a huge bonus for unloading off the truck.
    #32
  13. Switchblade315

    Switchblade315 I make people disappear

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    #33