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  1. #1

    Lawn Mower engine

    I have a Craftsman 3.5 lawn mower engine and I was wondering If I could possibly use it on a mini bike. It has a vertical shaft (which I was gonna cut off), and it has a horizontal shaft running on the side with a sprocket and chain. I was wondering if that would work if I cut the shaft flush? It's came from a self propel unit.

    Thanks,
    Zach

  2. #2
    also the sprocket has set screws holding it on. So it can be removed and switched for a clutch. It's a small shaft tho like the size of a sharpie marker.

  3. #3
    Senior Member mardyn's Avatar
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    Not sure, but I think the aux shaft runs at a significant reduction from the main shaft RPM... maybe as much as half speed.

    Save yourself some time and trouble, just get a horizontal shaft engine to stat with.

    mardyn

  4. #4
    no it spins fast one revolution for every one the normal shaft does. + I own it already so that's a plus. It's already running a #35 chain

  5. #5
    Senior Member mardyn's Avatar
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    Must be different from the ones I've seen... the aux shaft was driven off the cam gear which turn at 1/2 speed from the c/s rpm.

    Good Luck
    mardyn

  6. #6
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    just dump the idea, and save yourself the pain. Lots have tried, and I have never seen a success.

  7. #7
    Tom S.'s Avatar
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    Quote Originally Posted by Zach View Post
    I have a Craftsman 3.5 lawn mower engine and I was wondering If I could possibly use it on a mini bike. It has a vertical shaft (which I was gonna cut off), and it has a horizontal shaft running on the side with a sprocket and chain. I was wondering if that would work if I cut the shaft flush? It's came from a self propel unit.

    Thanks,
    Zach
    I'd like to see a picture of that, please, if you're able.

  8. #8
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    Easier just to take the motor and rotate it 90 degrees and make a new intake for the carb to make it live in the correct orientation.

  9. #9
    Banned Strigoi's Avatar
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    Quote Originally Posted by four-thirteen View Post
    Easier just to take the motor and rotate it 90 degrees and make a new intake for the carb to make it live in the correct orientation.
    are you serious?

    that won't work.

  10. #10
    Senior Member recoil's Avatar
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    Quote Originally Posted by Strigoi View Post
    are you serious?

    that won't work.
    If its a 4 stroke yes forget it you cant flip the motor because the sump needs oil, but if its a 2 stroke it shouldn't be much problem at all. As stated all you need to do it rotate the carby. Here if a picture of my bike engine that were produced as vertical shaft lawn mower engines.


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