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Old 02-15-2014, 04:43 PM   #1
Skooter OP
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anybody here put a motor on a bicycle?

Idea popped in my head today. Appears you can get an 80cc 2-stroke kit for under $200. Crappy cheap stuff no doubt, but what the heck, late winter project. This would just be a fun kinda thing, throw in the back of the truck when the wife and I go camping.
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Old 02-15-2014, 06:50 PM   #2
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Originally Posted by Skooter View Post
Idea popped in my head today. Appears you can get an 80cc 2-stroke kit for under $200. Crappy cheap stuff no doubt, but what the heck, late winter project. This would just be a fun kinda thing, throw in the back of the truck when the wife and I go camping.
Yes, a bunch of them. My dumbass BIL is a drunk and can't drive due to DUI's so they are his transportation He tears up one a year so I've built 5 for him.

It's about as cheap a motor as you can do. Buy a 415 HD chain and the spring loaded chain tensionor. Get the tool for removing the sprocket..trust me

Here's one I built and he tore up




Be ready to engineer everything for your bike.
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Old 02-15-2014, 06:50 PM   #3
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My kid was 12 or 13 when he said he was going to put a motor in his $15 thrift store beach cruiser. "Good luck with THAT!" I thought to myself.

But I'll be danged if he didn't pull it off (although after a fit of raging frustration when the rear wheel wouldn't cooperate). Ran like a banshee all around the neighborhood. Even rode it to school. Something was always coming out of adjustment; when the rear locked up once, he had to push it over a mile home with the rear skidding; he eventually mounted an ammo can just to carry tools.
True rat bike.
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Old 02-15-2014, 07:14 PM   #4
GreatLakesGuy
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Be ready to engineer everything for your bike.
That's pretty dope. How long did it take to put together? Or since you're experienced, how long would it take on the first time?
What kind of speeds can it hit, and what did you upgrade the brakes to?
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Old 02-15-2014, 07:16 PM   #5
trailer Rails
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That's pretty dope. How long did it take to put together? Or since you're experienced, how long would it take on the first time?
What kind of speeds can it hit, and what did you upgrade the brakes to?
Look at eBay, you can buy the kits pretty cheap. Be prepared to upgrade the rear wheel of break lots of spokes in your stock wheel.
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Old 02-15-2014, 08:01 PM   #6
Skooter OP
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Quote:
Originally Posted by Jamming View Post
Yes, a bunch of them. My dumbass BIL is a drunk and can't drive due to DUI's so they are his transportation He tears up one a year so I've built 5 for him.

It's about as cheap a motor as you can do. Buy a 415 HD chain and the spring loaded chain tensionor. Get the tool for removing the sprocket..trust me

Here's one I built and he tore up




Be ready to engineer everything for your bike.
Gonna continue reading up, really would like to do one of those. Looks like bikeberry has some stuff, too. That one looks alot like my $99 Walmart special.
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Old 02-15-2014, 08:09 PM   #7
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You kids have it easy. Kits...pfftt. Get an old lawnmower engine and make your own motor mounts with a file and hand drill
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Old 02-15-2014, 08:14 PM   #8
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an old chain saw motor is faster.

Rod
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Old 02-16-2014, 03:37 AM   #9
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That's pretty dope. How long did it take to put together? Or since you're experienced, how long would it take on the first time?
What kind of speeds can it hit, and what did you upgrade the brakes to?
The first kit I installed on his 99$ Walmart bike(ya hit that one in the 10 spot Skooter ) it took me all day. Now I can do them in about 3-4 hours. The biggest pain is the rear wheel coupler for installing the sprocket on the rear wheel . That has to be run true.

It'll do about 25 MPH with the 49CC 2 stroke and as far as the brakes, never upgraded them at all. That's his problem, I'm the motor guy, I just make them go, I don't do stop

Here in Arizona the law about a motorized bicycle is that as long as its 49CC and below its still considered a bicycle and does not require a license or insurance.
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Old 02-16-2014, 04:51 AM   #10
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Would you anticipate a more difficult installation on a multi-sprocket bike? My 99-er is identical to your pics except for paint, shock absorbing forks, and mine is 15 or 18 speed, forget which.
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Old 02-16-2014, 05:58 AM   #11
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Good fun for $160.

I had one shipped overseas. They are fun to ride, but be prepared to do lots of maintenance. My was wired, zip tied and taped together.

(click to play)
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Old 02-16-2014, 07:28 AM   #12
trailer Rails
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I have been wanting to build a bike using one of these motor kits. There is a company that makes a jack shaft to move the drive over to the crank. When you do that, you can then run the power through the bicycle rear drivetrain so you can have multiple gears.
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Old 02-16-2014, 07:56 AM   #13
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I had one shipped overseas. They are fun to ride, but be prepared to do lots of maintenance. My was wired, zip tied and taped together.

(click to play)
Cool vid, man. Must be a tinkerer's dream.
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Old 02-16-2014, 08:06 AM   #14
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So...would one of these in 49cc keep up with a 49cc Kymco type scooter? Because the bicycle seems a bit complicated for my wife, and I think I could get her to actually ride a scooter. I want the bicycle for myself.
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Old 02-16-2014, 09:37 AM   #15
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Quote:
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Would you anticipate a more difficult installation on a multi-sprocket bike? My 99-er is identical to your pics except for paint, shock absorbing forks, and mine is 15 or 18 speed, forget which.
Quote:
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So...would one of these in 49cc keep up with a 49cc Kymco type scooter? Because the bicycle seems a bit complicated for my wife, and I think I could get her to actually ride a scooter. I want the bicycle for myself.
No problem on a multi-gear bike. The rear wheel uses its own coupler for the rear wheel that's driven from the engine with its own chain. AFAIK, you can't do it on a rear suspension bike but I have done one with front suspenders.

I couldn't tell you if it would keep up with a scooter. Like I said 25 MPH if that, is the top speed. I can tell you be ready to adjust the chain and do the rings alot.

I'll have to check out the jack shaft one to see if its driven from the bike chain. Great idea.

Here's a video of a 4-stroke I built. Its on a rack that attaches to the back of the bike and drives the rear wheel on a separate chain. Great idea, no pre-mixing fuel, but the motor required a lot of maintenance, like adjusting the valves, carbs.

[IMG][/IMG]
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