Snowmobile Engine in a Dirt Bike

Discussion in 'Some Assembly Required' started by ScottyWarpNine, Aug 22, 2018.

  1. Tanshanomi

    Tanshanomi Your Favorite Uncle Supporter

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    Never used Castrol R myself. I've been a Golden Spectro user since my very first two-stroke.
    #41
  2. sieg

    sieg Wearing out tires......2 at a time, day after day. Supporter

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    I always use bean oil in my RZ 350 and I have the pump out put turned up, with the smoke and smell it turns heads. Smokey, smelly exhaust saves lives. :imaposer
    #42
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  3. lesman

    lesman Live easy, Brake Hard

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    When I was in high school . There was a kid who always smelled like castrol. He usually finished last. I always liked the smell of Castrol 2 stroke.
    It was always a purpose driven smell. If you smelled gear lube. You knew it was a car guy with a blown tranny or rear end. When you smelled bean oil you knew it was a moto crosser or perhaps a flat tracker with no silenced chambers (actually had one flat tracker in high school, he was bultaco rider). Bean oil meant to be loud and proud.
    #43
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  4. fast1075

    fast1075 Not a Lemming Supporter

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    I had Pursang that tried to kill me on multiple occasions. That thing was like a rank bull, it didn't like anyone on it. I sold it. The first time the new owner took it to the track, it broke his leg. Rank Bull.
    #44
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  5. ScottyWarpNine

    ScottyWarpNine Where's the trail?

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    I think I'm going to have to turn the engine upside down to fit the secondary clutch. It is slightly too big to fit in line with where I need the front sprocket to be, and I don't want to add another countershaft to the equation. Problem is I either need to chop the frame to go around the single carb, or come up with a dual carb setup, which would mean custom manifolds. Also, I don't really like the idea of the airfilters right behind the front wheel to begin with, but I do like the straight line that the exhaust would go through around the rear shock and under the seat.

    I'll have to look into the overheating in summer temps thing. I do know that sled engines have been used a lot in paramotors with success, so maybe I'll see what they're doing to keep them reliable.
    #45
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  6. sieg

    sieg Wearing out tires......2 at a time, day after day. Supporter

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    Do you realize that twin carbs may change the engines HP and torque characteristics? Like most probably less low end grunt, but on the other hand if the intake winds up longer because of it you may overcome that loss.
    #46
  7. ScottyWarpNine

    ScottyWarpNine Where's the trail?

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    Yeah, at this point I'm only looking at it as a packaging solution to fitting around the existing frame tube. It seems like a fairly common modification on these sled engines, but without actually doing it I cannot know how it will effect the engine's power or power band, or how that will impact the amount of usable power I have with the variator.
    #47
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  8. Tanshanomi

    Tanshanomi Your Favorite Uncle Supporter

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    I would think that at this point, a different/custom frame would be the lower effort option.
    #48
  9. ScottyWarpNine

    ScottyWarpNine Where's the trail?

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    I think you're right. It shouldn't be too hard to chop the down tube and have it split above the intake.
    #49
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  10. jays100

    jays100 Been here awhile

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    #50
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  11. CDN Rick

    CDN Rick Canoodia Eh?

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    My neighbor ownes this... he says it’s mine for $1800USD. I told him there are far cheaper ways to kill myself. Yet still i’m considering it.
    Note the rear sprocket size. Apparently it can be heard running from a few miles away.

    EC375428-A75F-461C-BCC9-478907730F09.jpeg

    A03D932D-E8BD-4E68-8A6B-5B95233ECA14.jpeg

    A66672BF-A9AC-427D-9F16-A224D97470C6.jpeg

    FFB549D1-C90A-4CF7-A22A-EFF03AF4630D.jpeg
    #51
  12. Tanshanomi

    Tanshanomi Your Favorite Uncle Supporter

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    That's the problem with CVTs on bikes – the width. They are really tough to package cleanly in a bike chassis.
    #52
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  13. tinwelp

    tinwelp Professional Idiot

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    NEVER try to turn right... :fpalm

    Unless you only like going in straight lines, run away.

    Cheers... Paul
    #53
  14. CRW

    CRW I dont want a pickle

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    It the heater for the future side car haha

    #54
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  15. XR4EVER

    XR4EVER 919 excuses to ride!

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    Turn it 90° and run a shaft drive. :evil
    #55
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  16. Tanshanomi

    Tanshanomi Your Favorite Uncle Supporter

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    Then the problem becomes the distance between the two pulley centers, and the diameter of the driven pulley.
    #56
  17. CDN Rick

    CDN Rick Canoodia Eh?

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    I feel like safety probably isn't the #1 concern for people putting a sled motor into a bike. Jus' say'in... :lol3
    #57
  18. anonny

    anonny What could go wrong?

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    This guy is squeezing 600’s into dirtbikes, pretty sure he’s done 800’s too.
    #58
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