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Old 12-03-03, 09:30 PM   #1
Jay_2004
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Motorized bikes...

Hey all.....This summer I made a bike with an engine on the back. I bought the engine at a garage sale for 5$...and replaced the gas lines for 6$....what a rip. Now...this thing was from an old water pump, and with a someodd whopping 23 cc's, it got me up to 40 kph, talk about speed wobble, especially down hills. I hooked a lawnmower throttle to it, and it drove a roller off of an old electric motor, on my wheel. Now...heres the question...has anyone else tempted this?...im 14, and it was alot of fun if you are really into mechanics, so post anything...thats if you have anything...it was a blast, untill it broke
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Old 12-04-03, 08:07 AM   #2
Dave Stohler
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What you have is called a motorcycle, not a bicycle. Most of us here are interested in bicycles.
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Old 12-04-03, 08:56 AM   #3
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Sounds interesting, I've seen some pretty weird contraptions put together from bicycles and motors.

A few weeks ago I was driving in the rain and jockeying around with an older man commuting on what looked like a touring bike (I always look at other bikes). He and I were in the right lane (stopped at a light) trying to turn right. He was behind me and passed on my right between the curb and my car, then proceeded four cars up to the light and he turned.

That really pissed me off as I hate to see other cyclist disobey traffic laws, and I just spent a good amount of time trying to get past him. Anyway, as I made the turn I was glad to see i could pass him (again) without trouble when he reached forward and yanked at something, then speed off at 30mph, sputtering engine and all.

Sears used to sell a motor you attached to the fork, I guess now adays you have to make them. can you post of pic?
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Old 12-04-03, 09:25 AM   #4
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There is a kid that I have encountered on a regular basis (once every couple months for several years) in my morning commute who rides such a contraption -- his problem is that he must reach to his back rack to disengage the motor from his wheel (he does have some kind of throttle -- but complete disengagement requires the reach). To avoid this awkward manouver, he often runs red lights and sometimes cuts it far too close infront of on-coming traffic. In other words, go ahead and have fun playing with the mechanics (its good education, if nothing else), but remember that studies have shown that 14 year-olds (and 15 and 16 year-olds) do not judge distances as accurately as 17+. Give yourself a wide margin of error if opperating on the road.

I also recently encountered an older guy (35+) wearing a suit and riding a bike that had some kind of weighted fly-wheel contraption attached to the rear wheel -- he could power up while coasting to a stop and then engage to help his accelleration when starting. It wasn't very large.
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Old 12-04-03, 05:26 PM   #5
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no sorry...i dont have a picture......but in total it cost me 11$ to make....and they sell around 400$ american for professional ones....but not picture
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Old 12-04-03, 05:40 PM   #6
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yeah...i was designing my bike for a long period of time...and then i was fed up...and did the simplest thing possible....which was to attach it so...it didnt dis-engage talk about dangerous.....but no worries to anyone...i was carefull...and i do know that many...many 14 year olds are very bad at jujement...i try to be my carefullest...(is that a word?)....but recently...i put a new back tire on the bike...(the tire had been worn down ALOT before the motor was on)....and when i did this...the roller that touched the tire sheared off inside the keyway in the crankshaft and ive been stuck ever since....i think i might need to weld it somehow. And to anyone out there who hasnt discovered the wonderes of threadlock....its a dream....on my bike with the engine...the system would fall apart from vibration every 10-15 seconds...but with threadlock...id have to check it only every 20-30 km but it still didnt come loose...it only stripped one screw on it it was so strong...(blue threadlock)....it was a dream...
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Old 12-05-03, 07:31 AM   #7
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What's the point, the engine would ruin the silence of well tuned bike going down the road, the gasoline smell and exhaust fumes would ruin the worlds natural oders and the overall satisfaction of cycling would be removed from the whole experience. Your physical conditioning would go in the toilet. I say ride the bike, engine power nothing, experience your world and enjoy the realities nature has to offer.
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Old 12-05-03, 03:44 PM   #8
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I say that I do what i want....and learn along the way...i did the project by myself...im 14...can you say you did anything that mechanically complicated when you were my age...dont critisize....it has to do with bikes...thats why i posted it....these are bike forums
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Old 12-05-03, 04:24 PM   #9
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I think it is cool. I ride my bike to work every day, but would love to make another bike that was homemade motorized. It would be good for getting groceries with a trailer for instance, or getting to work when you need a day off. I really gunned it home last night, I would have loved a motor this morning!
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Old 12-05-03, 06:47 PM   #10
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When I was in that general age range, I was so into tinkering with mechanical stuff, I don't know how many things I built -- boats, submarines (I wanted to mount a camera on it, but failed), small airplanes (wanted to mount a camera on one, but failed) -- it was a great education. So, enjoy and learn. But remember the safety issues; and also remember small gas motors do have a significant environmental consequence -- they pollute far more than cars. These days, I get far more enjoyment out of tricking up my bikes.
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Old 12-05-03, 06:52 PM   #11
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That is very ture...I did research and did find that they do pollute ALOT more than cars do. The bike is out of commisiong right now...and im taking your word and sticking to just using my own power... It is just as fun....and definately funner than using an engine
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Old 12-05-03, 06:56 PM   #12
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It sounds like an intersting contraption. obviously you are not riding it for fitness, it sounds like a cool project. My parents would probably never let me do something like that. When the transmission broke on my uncle's riding mower, I wanted to use the engine to make a go-cart, and of course they said no, it would be more trouble then it was worth, I don't think they understood that it is the trouble that I am after. but whatever. he sent the mower to the dump, and a good 3 years later I have a bianchi in the shed that I am in the process of fixing up...
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Old 12-05-03, 07:12 PM   #13
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If the Bianchi is more than five years old, I highly recommend Sheldon Brown's website as a wealth of information on how modern bikes have evolved over the last 20 years (or more) -- they look the same, but in many ways parts are not compatable and Sheldon describes them all: http://sheldonbrown.com/articles.html
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Old 12-05-03, 07:30 PM   #14
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Oh, I have had the bianchi for a while, and read up on it a lot. It is not one of the reparto corse framesets, it was the equivalent of about a $700 bike these days, equiped with next to lowest level compents, etc. but still a project no less. My grandad won the bike in a raffle back in '81, and never rode it becuase it was too big (57) but it fits me great.

Anyway, I don't want to hijack the thread too much.
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