View Full Version : Motorized Bicycle
12-18-2008, 11:34 PM
So I got a Huffy 18 speed pedal power mountain bike from a scrap heap and am wanting to make a motorized bicycle. There are kits for this, but I'm looking to make it real rat.
Two cycle chainsaw engines seem to be favored over two cycle weed whacker engines in my reading so far. More torque is the reasoning. I'm not opposed to being ridiculous and using a four cycle 2-3hp engine from a lawn edger. Briggs and Stratton, if I could get it.
This being a real rat and total side line project, it's not going to be done anytime soon. Just whenever I come across some parts. Finding the bicycle is what put me on this idea.
Anyone make or have a motorized bicycle?
12-19-2008, 07:56 AM
Yes, I have a motorized bike. I have a 4 stroke engine on mine. I also have a couple of electric bikes. There is info for motor bikes that is pretty good that I learned a lot from.
12-20-2008, 12:00 AM
12-20-2008, 12:24 AM
That luggage rack and cut frame looks familiar. Don't know if it's from seeing it here or a motorized bicycle forum.
How much welding is typically involved with this? Just the rear gear? My frame is aluminum and I don't have a welder. A small Bernzomatic oxygen and mapp gas set up is all.
12-21-2008, 11:10 PM
This particular bike took a LOT of fabrication (and a fair amount of welding) and it was a kit motor, however that is mostly due to the customizations. The rear gear was/is bolt on. If you are intending to custom design a (insert garden tool here) motor then I would wager from experience that you will almost need to do some welding in order to make custom mounts, brackets etc. I would suggest starting with a bike with a large “V” frame to lower the amount of fabrication needed (the opposite of what I tried). ;)
12-22-2008, 01:03 AM
or use a bike like I plan to (it's the one behind my bike and daughter ;))
a 1972 Schwinn 3 wheeler, I plan on mounting a motor in the basket on the back, I want to try and get the biggest motor I can (after redoing the tires, wheels and brakes on the thing LOL)
12-22-2008, 01:23 AM
Hey Gol, I've got a '79 KZ 650 four that I'm not doing anything with, at the moment. That'd make 'er scoot! ;) :D
12-22-2008, 02:23 AM
LOL I think that's a little much for this project, I was thinking more along the lines of a 10-15 hp motor :rolleyes:
12-22-2008, 02:42 AM
C'mon....there's no such thing as "too much power"! Throttle control, that's the key. ;) I've considered making a go-kart out of it. :)
12-22-2008, 11:54 PM
I knew some gents that put chainsaw engines on go-carts back in the 70's. Raced them. 100 MPH was not uncommon. Remember - if it goes it needs to stop.
But now you got me thinking. Smell that burnt wood? So if one supports a chainsaw engine in the frame, sprockets a drive belt down to the pedal sprockets...replaces them with a belt pulley (pretty sure the pedals have to go bye bye - better have a dang good guard with a belt running that close to the 'boys'...variable drive ratio by changing around the sprockets) to where you could keep the rear wheels gearing operational, use a thumb throttle off a 4-wheeler....hummm Shindawa? Husky? McCullough?
01-08-2009, 11:14 AM
I saw this in Popular Science awhile ago. Looks interesting.
01-08-2009, 01:03 PM
I had one of those chain saw motors in my go-cart in the 70's. Loads of fun.
I ride an electric assited bike a friend of mine owns, every once in a while. Its really great and you get to see the countryside real good--a blast.
01-14-2009, 11:56 PM
there is a kid near me w/ a weedwacker engine a a bicycle. looks like a lot of fun.
01-14-2009, 11:57 PM
or there is the Honda Hobbit. pedal or gas powered. these things are a blast!!!! I'll have to post pics when i get the chance
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