i want this bike, baaad.

www.spitfiremotorworks.com these babys are stylish.

 

save your money and get real one.

 

this is mine

 

"save your money and get real one." - Screw dat. this ones got enough style.

 

Here's one I built from a 70s banana bike, a chain saw engine, and some lawn mower parts.



And a 1977 Batavus HS50 moped that I refurbished. It looked pretty bad when I got it.

 

u could walk

 

rather a Ducati l think..

 

bah, ducati. you'll either get fat or killed riding one of those. The old powered bicycle is where its at.. slow down and enjoy the scenery..

 

ok i take it back. if i could afford a ducati id ride one. these are just in my budget is all. better to not want what you cant afford.

you should describe that chainsaw drive to me shaggie..is it like a friction wheel setup? the spitfire has a sprocket and chain on the opposite side of the rear wheel, and a clutch lever. to start it, you pedal up to speed , and pop the clutch...

 

That bike is sweet wideyed. There's a guy here in central cal that sells a kit like that for $200.


If I decide to stay here for awhile I'm probably going to get one.

 

The chain saw bike is belt driven. There are two belts. A pulley on the engine drives a belt which drives a jackshaft. On the other side of the jackshaft is a belt clutch which drives a belt which goes to a sheave (large pulley) on the rear wheel.

I welded the sheave on the rear wheel rim with a TIG welder.

.

 

I also have another small engine that works by a friction roller against the rear wheel. I haven't mounted this to my other bike yet. I'll try to post a pic of the engine. I forget now who makes it. It's a neat little engine. I think it's called the MK5.

The problem with the friction drive system is that the gear ratio is fixed. It doesn't matter what tire diameter you have. The speed/torque of the bike will always be the same, unless you were to change the diameter of the roller on the engine.

With chain or belt drive, you have freedom to change the transmission ratio with different size sprockets or pulleys.

An advantage of the friction drive MK5 is that you can totally disengage the engine and drive it like a normal bike with no friction. You can't always do that with chain or belt drive. On my chainsaw bike, when the belt clutch is not spinning, the belt is fairly loose and the bike can be driven like a normal pedal bike. There is still a little friction, though.

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Many of the new engines are really poor quality, especially some of the ones coming out of China and India. If you look at the castings of the crankcase/cylinder, you can see cracks and air bubbles in them. I can even scrape pieces of the casting off with my finger nail sometimes. You can imagine what happens to the engine when a piece of casting gets loose in the cylinder or crankcase.

The really cheap engines have the cylinder, head, and crankcase all cast as one piece. It's cheap to produce but difficult to service. You use it until it breaks then throw it away.

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The MX5. It's a quiet running engine.

 

More bike stuff:

http://www.staton-inc.com/index.htm

http://motokruisers.com/

http://motokruisers.com/?p=13#more-13

http://www.bicycle-power.com/

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i need to start riding a regular old fashion bike for some exercise :&

 

i like this bike. am i a dork or what? dont answer that

 

no no, thats a stylish bike.the white walls are really eye catching. it looks like a single speed tho' so if you want exercise, thats definitely your machine... .

shaggie - thats damn cool that you like powered bikes. that spitfire motor is a chinese product like yyou warn about, but i love how it mounts inside the frame. your other creations are impressive.. maybe in the spring i'll have something to post that's similar.

 

oh yay, thanks
hehe

 

I like those old white walled 50s style bikes. They used to make some that had a headlight with the battery holders built into the frame of the bike. Pretty neat.

If you live anywhere near a NASA facility, they have auctions/sales of their surplus and sometimes have those old style bikes.

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