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DIY Home Built Motorized Bicycle (non kit) Post all about your home built rides here. Weedwacker motors, lawn mower engines ect. This area is for non kit builds

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  #1  
Old 11-25-2008, 07:01 PM
Bikeguy Joe Bikeguy Joe is offline
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Default Deacon's DIY Electric Bike Forum!

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  #2  
Old 11-25-2008, 10:17 PM
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Default Re: Deacon's DIY Electric Bike Forum!

sounds like a plan
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  #3  
Old 11-25-2008, 10:30 PM
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Default Re: Deacon's DIY Electric Bike Forum!

The first thing I have to do is to choose a motor. Actually I have a few still laying around. I have only friction drive since it is what I like the best. One of them has a small twist but it's still basically friction drive.

Now that I can weld, (not well yet but still I can butcher metal) I can make a decent mount. Right now I'm thinking front wheel drive but everything over the wheel for balance, rear luggage carrier also over the wheel for the battery pack. With a small rear wheel the balance might be pretty good, even with the heavy batteries balanced over it. I can build a good solid carrier for the batteries.

Should be interesting to see what I can salvage from the junk I have laying around. Well I guess I will give it some serious thought tomorrow.
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  #4  
Old 11-26-2008, 06:46 AM
Bikeguy Joe Bikeguy Joe is offline
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Default Re: Deacon's DIY Electric Bike Forum!

I am looking forward to this....been thinking of an electric of my own....made of wood.
  #5  
Old 11-26-2008, 07:23 AM
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Default Re: Deacon's DIY Electric Bike Forum!

Now you are talking third world bikes by joe...

I have a couple of prelim questions. My first purchase might just be a brand new (heavern forbid) bike. I hear the gasps already.

Okay I always thought bikes with gears were for wimps, but alas that might be the way to go with this build. So I'm going to pick your brains for ideas,

Now on a 99speed bike, they have two sprockets on the crank. Do they both turn at the same time. I ask that because a brushed electric motor will charge the batteries when it is moving faster than being called for. Ie not in use at the time.

If they do I might pick up one and try to run the electic engine to the smaller of them. Then pedal with the big one and the few gears that are left to me. If that works I could conserve a lot of battery by leaving the engine off most of the time. I see these old farts er guys going down my street all the time on those bikes. So it wouldn't be a problem to coast with the engine off or even go on the flats. Plus I could take the thing on the bike trails nobody would know.

Second question. How hard would it be to remove the smaller one and put on a different crank. I have a #25 large sprocket and chain plus that is what comes on the motors I have. Now that would be the cats meow if I could switch those out.

If not i can get a flat bike sprocket and weld it to the sprocket on the engine. The bike sprocket is larger so it won't be a problem. Well it will be a balance problem but nothing more.


Unlike a gasoline engine the electric freewheels no problem. Just shut it down and it becomes a little drag but nothing else. And my motors even charges the battery,

So answer up guys and help the fatboy with his ebuild...
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Last edited by deacon; 11-26-2008 at 07:32 AM.
  #6  
Old 11-26-2008, 07:47 AM
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Default Re: Deacon's DIY Electric Bike Forum!

I'm thinking about this on the motor mounted to the from above the crankset. Chained to the smaller of the chain rings.
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  #7  
Old 11-26-2008, 07:50 AM
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Default Re: Deacon's DIY Electric Bike Forum!

all the gears on the front crank will move together when you pedal
  #8  
Old 11-26-2008, 09:55 AM
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Default Re: Deacon's DIY Electric Bike Forum!

That should be fine the electric motor will free wheel and actually charge the battery when not in use. I would just have to remember to turn it off so that the pedals wouldn't beat me to death going downhill.

I really am in a quandary. I can buy a suspension mountain bike with all the bells and whistles for a hundred bucks at wallymart, or I can buy a sprocket like on the china kit for the bike I have and mount the motor to inside of the seat post and run the chain that way. The twenty inch rear wheel and small sprocket on it now makes it a good hill climber. Have to do some thinking.

Or I could look for a thrift store bike with two front chain rings and just move the small wheel to it and remove the gear stuff from the rear. I do that all the time.

either one is doable it seems.
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Last edited by deacon; 11-26-2008 at 09:58 AM.
  #9  
Old 11-26-2008, 10:37 AM
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Default Re: Deacon's DIY Electric Bike Forum!

I have been thinking about how to attach the motor to the frame of the bike. I think I have the method worked out. I will weld a six inch heavy bar to the bike frame cross way under the top bar. Then I will attach the motor with a couple of large pipe clamps from the plumbing section of the hardware store. That will allow me to adjust the position of the motor easily. Those clamps are pretty strong.

Im still trying to decide whether I want the china kit sprocket or to use the extra chain ring. The china kit would allow me to ride it under power even faster than I want to pedal, but I primarily want the bike for exercise and to run short errands so do i want to ride it under power most of the time?

Something to think about. By the way if I can I will take the lazy way out so I need to decide for sure before I start...
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  #10  
Old 11-26-2008, 11:01 AM
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Default Re: Deacon's DIY Electric Bike Forum!

I know I am going to bore you all to tears but I went out and took a look at the bike. It also looks as though on a coaster bike you could mount the motor in front of the frame on the down rod. You could extend the chain a few links and run it over the motor as well as the chain ring. It seems to me that would work just as well. I might go that route as well. I have a spare coaster brake bike sitting around. It's my old three speed converted to a single speed with the small rear wheel. It might be ideal.

By the way I'm sure you all know there is very little drag with an emotor so I should be able to go pedal only or coast without too much problem.

So okay bike people which mount sounds the easiest and has the best change to succeed. I'm gonna take votes here lol.
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Last edited by deacon; 02-21-2009 at 10:18 AM.
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