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Old 02-11-08, 08:21 PM   #1
kjmillig
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Gasoline Engines

OK, so I've blasphemed at the thought of installing a gas engine on a bike to use for commuting, but they're claiming extreme MPGs. Who's had experience with one? What are your recommendations as to manufacturers?
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Old 02-11-08, 10:14 PM   #2
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The best one I've ever seen was a guy who did a home made kit. He used a weed eater and had it set up using the front derailleur to engage it to the rear wheel. It was mounted with the engine in the back mounted to a rack, the shaft mounted to the seat stay and the hub had been removed and replaced with a 1" deep socket that ran against the tire when engaged with the front derailleur.
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Old 02-11-08, 10:26 PM   #3
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honda super cub? it's like a bike. uses a 4-stroke
most small engines use mixed diesel fuel 2-stroke systems because they give nice power.
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Old 02-12-08, 09:26 AM   #4
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Quote:
Originally Posted by kjmillig View Post
OK, so I've blasphemed at the thought of installing a gas engine on a bike to use for commuting, but they're claiming extreme MPGs.
http://www.motoredbikes.com/ is the forum to go to for bicycle gas engine info.
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First you want to find out if motorized bicycles are legal in your state. Ask your dept of motor vehicles "if you put an engine on a bicycle yourself, if you can still ride it on public streets". Don't ask them about "motorized bicycles" or "mopeds", because in many states, those are technically different vehicles. Every now and then there's somebody who buys and puts a motorized bike together, and then they get told by cops or the motor vehicle dept that they can't ride it--because motorized bicycles are prohibited in their state. Many people assume that you can register it as a moped if you want, and OFTEN that is not true.

Cost is $150-$600, plus whatever bike you put it on.
Reliability is basically "you get what you pay for".
Some people have motorized bicycles with engines that they have put 10K-15K+ miles on. Some people make cross-USA trips on them.

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I got a Golden Eagle kit, back when midwest/US gas first hit around $3 gal, but it took me a year or so to get it on a good bike for it. I haven't had the chance to ride it more than a couple hours before cold winter weather set in. 175-200 MPG is typical for the 35cc 4-stroke engine I have, and the top speed is 27 MPH.

Some engine kits will do up near 50 mph, but these are larger 2-stroke engines, not the most fuel-economical, or least-polluting.
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Old 02-14-08, 05:39 PM   #5
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there are lots of kits you can buy to convert a bike, whizzer is the first brand name that pops into my head. 4 cycle, 2 cycle (mixing gas and oil together to lubricate parts) belt drive, chain drive, etc. in all reality, you'd be better off buying an old moped for use on the road. a moped will have a full electrical system with tail lights/brake lights, blinkers, headlight, as well as a sturdy frame. yeah, you have to ride in traffic on a moped, but no biggie. riding a motorized bicycle in the bike lane is cheating, if you ask me. and if you're gonna run a motor on something, for safety's sake you should have full lights and have to pass a safety inspection.

grab yourself a vintage moped, get good gas mileage (~100mpg with out adding performance kits, etc. and keeping it in tune) and look good doing it!


i used to run a vintage moped shop, so i may be a bit biased, but if you have any questions, let me know!
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Old 02-14-08, 08:49 PM   #6
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Keep in mind that the energy required to move you forward is reduced drastically as your speed slows down- so you ought to get exceedingly good milage at 20 mph. Of course, if a car was properly engined and geared for it, it would get wonderful milage at 20 mph, too.
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