Chainsaws,weedwhackers,snow blowers...oh my!

Discussion in 'Rack Mounted Engines' started by Guest, Apr 14, 2007.

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  1. Guest

    Guest Guest

    Has anyone just mounted up a chainsaw engine, with the proper centrifugal clutch and chain to drive a bolt on type sprocket like the Chinese engines use? The felt pad type?

    Seems too easy. I have an extra much is a sprocket and adapter?
    Last edited by a moderator: Aug 11, 2007

  2. srdavo

    srdavo Active Member


    I have a McCULLOCH engine. It's 32-33cc. wanna see it? sure you do. 8)


    did this come off a chainsaw? would this be sturdy enough to power a bike? duh....sure it is. this is the same as a mid-size gebe powerplant. With the right gear ratio, this will work. I have a bunch of Q's :?
    we should talk. (I have sprockets.... with all the fixins) 8)
  3. Guest

    Guest Guest

    Yeah, I had a notion to mount my Husky or my Stihl engine on a bike and just run a centrifugal clutch with a chain going to the rear wheel via a sprocket like the Chinese engines use.

    I haven't looked at either, but I'm guessing mounts will be the hardest part...I got a hundred pounds of various aluminum plate from .090 up to 1/4". I have some "saddles" from ultralight aircraft-used to bolt flat stuff to round stuff. In fact I have a boatload of tubing ect ect. from ultralights...I EVEN HAVE A 440CC KAWASAKI!!!! :shock: :lol:

    I keep bidding on a dax, but I keep getting shot I started thinking.....
  4. Guest

    Guest Guest

    Looks like it's from a weedwacker. 33cc is enough. My 50cc Vino goes 40+ with me and a hundred and sixty five pounds of scooter. It's a CVT, but the clutch should be fine for a bicycle.

    I think I'll look into mounting a chainsaw engine on my Next Monterey whateveritscalled.

    I have to buy or make a sprocket set up, felt padding and all. Anybody got an extra for sale? 44T or 36T?
  5. srdavo

    srdavo Active Member

    Re: hmmm.....chainsaw?

  6. Hugemoth

    Hugemoth Guest

    How are you going to gear it down? Possibly a jackshaft setup?

  7. srdavo

    srdavo Active Member

    that was one of my questions..... :D
  8. Guest

    Guest Guest

    Well, for starters, how much do I have to gear it down? I mean if I run a 9-11 tooth sprocket on the clutch, and a 44T on the rear, how much would that get me? What are the number of teeth on the sprockets on the Chinese engine?

    I should be able to run direct drive, just like a go kart or minibike, no?
  9. Hugemoth

    Hugemoth Guest

    In order to get the right gear ratio without the use of a jackshaft you would want a rear sprocket nearly the size of the bike wheel. The little Chinese engines are geared down something like 10/1 and then another 4 to 1 with the chain sprockets. You can figure your gearing mathmatically since you know the RPM of the engine and the size of the bike wheel.

  10. srdavo

    srdavo Active Member

    Last edited: Aug 16, 2007
  11. Guest

    Guest Guest

    Yeah, I knew they were geared down but I didn't realize that it was that much....most motorcycles have a primary reduction of closer to 2/1.

    I guess you can teach an old dog new tricks!
  12. Guest

    Guest Guest

    I also just realized these China engines run BACKWARDS!!!!!!!
  13. Hugemoth

    Hugemoth Guest

    Interesting observation. That brings up an idea. If you changed the position of the magnet on the crankshaft you could run the engine the other direction and mount it upside down to drive the other side of the bike wheel. You would have to make an intake manifold to keep the carb upright. With a big bike frame you could run 2 engines, one driving each side of the rear wheel.


  14. srdavo

    srdavo Active Member lost me, Moth. :???: What does the position of the magnet have to do with direction? would it be timing?
    also, if the chinese engine was mounted up-side-down, would the bottom end get lubed properly? (might be a silly question, but gravity still blows me away. :)
  15. srdavo

    srdavo Active Member

    meanwhile....back at the ranch......

    oh yeah.....chainsaw engine gear reduction.
    somebody correct/school me at any point.
    okay...what we know....the chinese engine is reduced 83/20, roughly 4/1.
    I use 10 tooth front, 50 tooth rear, another 5/ we're up to 9/1. Am I right so far?
    On my mcculloch engine, if a jackshaft was used....I need to know ballpark numbers to achieve the same 9/1 reduction. would you start with 10 teeth on the engine to, say 44 on the jackshaft.....then 10 from the jackshaft to 44 on the rear wheel? Am I getting warm?
  16. Guest

    Guest Guest

    Yes. That's where you want to go with it. Not only are you in the ballpark, you've got box seats on the tird baseline!
  17. srdavo

    srdavo Active Member

    "put me in Coach, I'm ready to play" :D
    I'm thinking rackmount here. Seems (in my mind) easier, for mounting & chain alignment issues. Plus, I really dig what Haggard is doing.
  18. srdavo

    srdavo Active Member

    Coming Soon.......


    to be continued........
  19. psuggmog

    psuggmog Guest

    I have a couple of 100cc and a 125cc Husky powerheads. I have thought of machining an adapter to fit the spline on the clutch and the internal threads of a trackbike hub cog(sprocket). The saws are much wider than the little chinese bike engines.
    HUsqvarna 3120XP Cylinder displacement: 7.3 cu.inch / 118.8 cc
    Power 8.4 hp / 6.2 kW
    Max RPM 12 000
    Here's a picture of the Dolmer motorcycle powered by 24 chainsaw powerheads:

    Attached Files:

    Last edited by a moderator: Jul 29, 2007
  20. srdavo

    srdavo Active Member

    psuggmogg... you have a pm....gotta couple questions fer ya, if ya don't mind :cool:

    i saw the videos of that monster chainsaw machine....took forever to start...what a screamer!!!
    Last edited: Jul 29, 2007