Snowmobile Engine in a Dirt Bike

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

  1. ScottyWarpNine

    ScottyWarpNine Where's the trail?

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    I considered mounting my engine upside down for space to mount the secondary clutch like the hill climber, but I decided against it. It's probably alright for racing, but for normal use I would think it woild foul plugs constantly.
    #21
  2. bk brkr baker

    bk brkr baker Long timer

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    Yes , nitro burning . 540cc class limit ,any fuel ,any mods just a safety check.
    #22
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  3. kioti

    kioti Cruzinonline

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    Any Two stroke with a diaphragm pulse type pumper carb will run the same no matter how they are mounted, think weed whacker's, chain saws.
    #23
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  4. ScottyWarpNine

    ScottyWarpNine Where's the trail?

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    Right, I was thinking more along the lines of spark plug placement, even my weed whacker has its cylinder pointing straight up when it's laying on the ground and I'm trying to start it. I figured that was so that fuel couldn't pool up in the top of the cylinder head and foul the plug.
    #24
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  5. sieg

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

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    :fpalm
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  6. ScottyWarpNine

    ScottyWarpNine Where's the trail?

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    Hey man, if I'm wrong tell me I'm wrong. You spend your whole life learning.
    #26
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  7. sieg

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

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    You're wrong. :beer
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  8. ScottyWarpNine

    ScottyWarpNine Where's the trail?

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    Fair enough. I can't say I've ever seen a 2 stroke engine in a production "thing" mounted with its cylinder pointing straight down, whether that be lawn equipment or a vehicle.
    #28
  9. SCR100

    SCR100 Long timer

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    I'm from the South so I know nothing about snowmobiles, but I assume the shroud is part of a fan/cooling system? If the engine will be exposed in the motorcycle frame, is it still needed?
    Just curious.
    #29
  10. bk brkr baker

    bk brkr baker Long timer

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    When you get it right , test and tune .

    [​IMG]

    After he retired from hillclimbing , he made some street versions.
    #30
  11. Luke

    Luke GPoET&P

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    Radial aircraft engines. Although given how long after startup it takes them to run on all cylinders they might be an example against running inverted - when possible.
    #31
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  12. bk brkr baker

    bk brkr baker Long timer

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    [​IMG]

    One of Ted's with a right side up motor.
    #32
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  13. Bigbore4

    Bigbore4 Long timer

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    That particular engine is fan cooled, so yes needed.
    #33
  14. ScottyWarpNine

    ScottyWarpNine Where's the trail?

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    I think I could get away with running the engine without the shrouds and fan being in an open chassis, but I think I'm just going to leave it as is. I think it looks cool anyway. They did make a "free air" version of these Kohler engines without the shroud or forced fan cooling, but I'm not sure exactly what difference in application that would have been for.
    #34
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  15. Fubars

    Fubars What would Scoobydo?

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    Leave the Punisher stickers on.
    #35
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  16. Junglejeff1

    Junglejeff1 Long timer

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    From a guy that has messed with snowmobile,s alot.The air cooled engines do not cool well in the summer as they are designed for cold weather.We tried them in carts and a honda odyssey when I was younger.My rv250 skidoo free air was even worse than the forced air models.Damn thing would heat sieze above 30 degrees no matter how it was jetted.They ussaully are smaller finned so they can sort of adjust to the cooler temps better.I was riding a yamaha 292 single in minus 32 degree temps and there was ice on the cooling fins and it still ran decent.
    #36
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  17. dpforth

    dpforth no inline fours

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    It's okay, it's backwards too.
    #37
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  18. Richarde1605

    Richarde1605 Long timer

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    Castrol R is the bean mix that had the best aroma, I have a lectron in a box somewhere. My 550gt had a threeintoone bassani exhaust.That it's gone fills me with regerts sic. I would swap several that I own to get it back, just to fix some stuff that I know more about now! Even pushbikes have better brakes than them.
    Can you send me a sample of the Klotz? I have used, seen, smelt it with methanol model engines, but that is probably a different blend.
    :-)

    Sent from my SM-G950F using Tapatalk
    #38
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  19. Richarde1605

    Richarde1605 Long timer

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    Hahaha, a welder once told me that makes you a grinder...

    :-)

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    #39
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  20. fast1075

    fast1075 Not a Lemming Supporter

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    I don't know if they still make "Green Label" anymore, at least in the old school formulation. It was Castor with a touch of nitro methane in it. Bean oil has that distinctive smell. It is one of the very best lubricants, but it will carbon up and stick the rings. Valvoline used to make a really good 2 stroke oil they packaged for Honda, but it didn't have the SMELL of bean oil. I used it in my CR-125 and it did well. Never had a lube related problem.
    #40
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