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anyone motorized a bicycle before?

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anyone motorized a bicycle before?

Old 10-10-15, 01:26 AM
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anyone motorized a bicycle before?

I'm considering getting a pos mtb and motorize it for off road and touring uses, using one of the 80cc kits that costs ~$150 on ebay. Anyone done this? I've got some questions..

legal:
one of the major reasons for doing this is because I don't have to pay for registration and insurance on it, or at least I hope so. TX law states that it needs to meet 3 standards (<50cc, <30 mph top speed, automatic transmission).. But I'd like to think even if it's 80cc, it shouldn't be a big deal, right? I mean it's not like I'm going to be pulling wheelies with this thing. I can't imagine being pulled over and having to prove it meets state regulations..

maintenance:
I imagine the thing should be pretty straight forward right? carburetor and spark plugs should be the main things right? single cylinder should be pretty reliable.

saw some youtube videos on these 80cc engines. thing sounds like a tractor, even with the muffler. any way to address this?

I assume there's no catalytic converter, with it being so cheap. any health concerns with that?

are wheel changes a huge PITA? or is it not really a common problem with mountain bikes? the thing weighs about 25 lbs, which isn't too bad. I can't imagine that would be too much of a problem for 2" or 2.5" knobbies. right?



I'm considering taking a motorcycle around the country. however, I find taking a bicycle much more attractive. But I also don't want to pedal up mountains and through the desert. And I don't want to buy a dirt bike that costs money... So motorized bike sounds like a perfect compromise..

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Old 10-10-15, 10:37 AM
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Originally Posted by spaztastic View Post
. . . I'm considering taking a motorcycle around the country. however, I find taking a bicycle much more attractive. But I also don't want to pedal up mountains and through the desert. And I don't want to buy a dirt bike that costs money... So motorized bike sounds like a perfect compromise..
Your first clue: a motorized bicycle is a motorcycle.
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Old 10-10-15, 10:59 AM
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My cousins, who lived on a farm, had welders and discarded chainsaws and stuff laying around, tinkered with stuff like that.
Me, apart from the fun of the build, I never saw the point. Motorizing a bicycle creates a poor bicycle and an even poorer scooter/moped.
But I guess it'd make a little bit of sense if you do want a scooter, but is worried about running out of gas.

Keep in mind that laws generally aren't open to debate. The risk of being stopped and checked might be low, but if it happens, don't expect to get away on account of being "almost" legal.

Don't understand that bit about "sounding like a tractor". Tractors will rev a lot less than your 80 cc. Aren't these two-stroke? Do you want it louder? Quieter?
Unless you're riding in a perfectly matched tailwind, 2-stroke is no health concern for the rider. But you will be spewing unburnt fuel all along your route.
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Old 10-10-15, 11:28 AM
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I wouldn't want to deal with a gas motor. One day, on my commute, I was passed by a guy with a gas motor on his bike. The next day, I saw the bike leaning up against the fence along the bike path, disabled.

I think electric motors are the way to go
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Old 10-10-15, 11:52 AM
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Originally Posted by unterhausen View Post

I think electric motors are the way to go
until they make something cheaper, that charges faster, and has higher energy density than lithium ion, electric vehicles will still exist in the shadow of gasoline. (although tesla is making strides with their charging infrastructure) but my point stands, would you tour on an ebike?
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Old 10-10-15, 11:54 AM
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Originally Posted by AnkleWork View Post
Your first clue: a motorized bicycle is a motorcycle.
no
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Old 10-10-15, 12:00 PM
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Originally Posted by dabac View Post
My cousins, who lived on a farm, had welders and discarded chainsaws and stuff laying around, tinkered with stuff like that.
Me, apart from the fun of the build, I never saw the point. Motorizing a bicycle creates a poor bicycle and an even poorer scooter/moped.
But I guess it'd make a little bit of sense if you do want a scooter, but is worried about running out of gas.
I beg to differ.. a poor bicycle, sure, because it adds 25 lbs and a ton of extra drag from the engine sprockets. but it has WAY better power to weight ratio than a scooter, meaning I would still be able to take it off road, get better mileage (approximately 300 miles/gal), and I probably don't have to worry about registration and insurance, until someone tells me otherwise.. I've seen these things in Austin, and none of them have license plates..


Keep in mind that laws generally aren't open to debate. The risk of being stopped and checked might be low, but if it happens, don't expect to get away on account of being "almost" legal.

Don't understand that bit about "sounding like a tractor". Tractors will rev a lot less than your 80 cc. Aren't these two-stroke? Do you want it louder? Quieter?
would like to have it quieter

Unless you're riding in a perfectly matched tailwind, 2-stroke is no health concern for the rider. But you will be spewing unburnt fuel all along your route.
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Old 10-10-15, 12:08 PM
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LBS is installing quite a few Mid drive Electric Motors as they just replace the crankset, not the wheel .

More torque than in wheel Motors .. Many users are Hunters And use MTB to get further back in the Woods during Elk Season.

Want a Petrol fueled MoPed ?, Go Buy One.
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Old 10-10-15, 12:29 PM
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I sense a lot of animosity towards gasoline. I'm in the same boat. but can we put that aside? this thing isn't clean, but it probably has less environmental footprint than a hybrid, with a versatility that goes beyond mopeds. am i the only one who sees this?
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Old 10-10-15, 12:32 PM
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NL Signs Many paths to be usable by Mopeds & bicycles .

One particular maker Derny Has a Very collectable Moped used in Velodrome racing, as a Pace Bike blocking the wind for the following Cyclists.



There already was a sub section on this in the Electric bike subforum

http://www.bikeforums.net/electric-b...-bicycles.html

Last edited by fietsbob; 10-10-15 at 12:37 PM.
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Old 10-10-15, 12:32 PM
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Originally Posted by spaztastic View Post
I sense a lot of animosity towards gasoline. I'm in the same boat. but can we put that aside? this thing isn't clean, but it probably has less environmental footprint than a hybrid, with a versatility that goes beyond mopeds. am i the only one who sees this?
Your second clue: it's a bad idea any way you slice it.

Regardless of animosity, beliefs, attitudes, gasoline, electricity, mechanical design, pollution, noise, the law -- none of that matters. It's a fundamentally bad idea from first principles and you can't turn it into a good one no matter how much you fantasize.

Last edited by AnkleWork; 10-10-15 at 12:59 PM.
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Old 10-10-15, 12:36 PM
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Nope, no one has ever done it. Or even thought about it.
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Old 10-10-15, 12:41 PM
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Originally Posted by AnkleWork View Post
Your first clue: a motorized bicycle is a motorcycle.
Thread over. Post #2 wins.

Next topic.
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Old 10-10-15, 12:43 PM
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Originally Posted by spectastic View Post
I sense a lot of animosity towards gasoline. I'm in the same boat. but can we put that aside? this thing isn't clean, but it probably has less environmental footprint than a hybrid, with a versatility that goes beyond mopeds. am i the only one who sees this?
It may put out less CO2 than a hybrid since it doesn't use as much gasoline, but in terms of hydrocarbon (HC), carbon monoxide (CO), and particulates (smoke), the cheap two-stroke engines produce far more of these harmful emissions.
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Old 10-10-15, 12:46 PM
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Read your state vehicle code , the size of the motor determines the Licensing , and thereby the Insurance requirements.
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Old 10-10-15, 12:48 PM
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attachment.php

Uncomfortably loud, but otherwise look like could be fun and not too expensive if you are very handy with building stuff and have some source materials.
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Old 10-10-15, 01:25 PM
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Bicycle components aren't designed to be motor powered and don't last for long if abused that way.
I know because I had a motorized bicycle around 1966, if this answers your question.
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Old 10-10-15, 03:21 PM
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Originally Posted by spectastic View Post
would like to have it quieter
Do you know the different strokes of a 2-stroke vs a 4-stroke?
2-strokes are VERY dependent on a good flow of both intake air and exhaust gasses to make any power. To get it quieter, the obvious fix is to add another/bigger muffler. Unfortunately, if you lose some noise, you ALSO lose some flow. Less noise, less flow, less power.

Somewhat simplified, but basically true.
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Old 10-10-15, 03:46 PM
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1. Wrong place for advice on motorized bicycles - little interest or knowledge here.

2. Right place(s) very easily found - Google motorized bicycle forum. LOTS of options.​
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Old 10-10-15, 04:41 PM
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Saw this listed today:

Motorized bicycle

BTW, Might be the wrong crowd to ask.
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Old 10-10-15, 05:58 PM
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Originally Posted by El Gato27 View Post
BTW, Might be the wrong crowd to ask.
ya no ****
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Old 10-10-15, 07:35 PM
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In most states, the 80cc motor is technically illegal, 49cc is the max to get away with it still being considered a "motorized bicycle." Although there are people around my down with 80cc motors and it's not like the cops go after them for engine displacement.

You might be able to make them quieter, but then you will be into mods that are hardly bolt on and go. Any exhaust mod will probably require carb re-jetting. Do you know how to do that...?

They are not at all dependable, and require a lot of user involvement and attention. They are ramshackle affairs which tend to shake themselves apart and off bikes. Many owners find themselves rebuilding such engines on a more or less regular basis. They like doing things like this. Do you?

They would suck offroad, where they would be subjected to even more destructive shaking and jolts.

Offroad as well, check regulations in your area -- any offroad internal combustion device may need a spark arrestor as part of the exhaust. See exhaust mods above.

2-stroke engines burn a gas/oil mix. They use the intake charge of gas/oil and air to push the burned exhaust out and in doing so, some of the incoming unburnt charge inevitably exhausts. They have not been used in production street motorcycles in 30+ years, and have effectively been phased out or will be shortly on off-road vehicles such as snowmobiles, ATVs, dirtbikes, and personal watercraft. Why? Because they are such inveterate polluters. It would not surprise me at all to learn that a tiny clip-on bicycle 2-stroke engine pollutes more than a hybrid car engine.

Other issues:
- brakes. Your left lever becomes a clutch lever so you either need to run a splitter from the right lever to operate both brakes, or a coaster brake rear wheel. No rear disks allowed because of the chain drive on the left side.
- wheel changes. Why yes, wheel changes will become a PITA because you have an extra chain to deal with.
- cables. Cable management as you will have a throttle and clutch cable to deal with.
- speeds. Single speed is basically where you'll be, although you could probably kludge something together with an IGH or derailleur. Where you'll put the shifter is another story -- remember, your right grip is now a throttle assembly. Choice of IGH will be limited by hub flange diameter and the ID of the rear sprocket mounting assembly.
- gas/oil mix. If you're planning to refuel en route, you'll need to bring two-stroke oil with you, in either single shot bottles or with some way to measure it out.

Having built one, I rode it a couple times and promptly sold it for parts, turned the bike back into a bike. And then went and bought an actual motorcycle. Were I to delve into a motorized bike in the future, I would look into an electric hub motors...
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Old 10-11-15, 06:43 AM
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Originally Posted by El Gato27 View Post
Might be the wrong crowd to ask.
Originally Posted by spectastic View Post
ya no ****
Let's see, only took 22 posts to get a fairly full answer, involving only one person's experience, when you could have simply gone to one of dozens of sites specific to your query. I'd say El Gato has a point.
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There's no such thing as a routine repair.

Don't tell me what "should" be - either it is, it isn't, or do something about it.

If you think I'm being blunt take it as a compliment - if I thought you were too weak to handle the truth or a strong opinion I would not bother.

Please respect others by taking the time to post clearly so we can answer quickly. All lowercase and multiple typos makes for a hard read. Thanks!

Last edited by cny-bikeman; 10-11-15 at 07:42 AM.
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Old 10-11-15, 07:26 AM
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I also belong to a fishing & hunting forum. A post was started titled "What are you packing daily?". Many, many responses, eventually one member posted that he was out daily with FOUR guns! I guess that was too much for some commie Obama wuss who preached something about gun control/paranoia. You can imagine the responses to that!

Very sad and funny...

Gotta know your audience.
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Old 10-11-15, 07:36 AM
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When I was a kid we put lawn mower engines on bikes.

We took a street sign and cut it so it could be mounted horizontally in the middle of the bike. We then mounted a lawn mower engine we got from the garbage dump. We got a fan belt pulley from a washing machine and cut the center out. It was attached to the rear wheel with bolts and large fender washers. A brake cable was use to control the throttle and a fan belt connected the engine to the rear wheel. If you had money you bought a centrifugal clutch, but us poor folk used a idler pulley on a lever that we moved and was left in place by a bolt running through the top tube.

Very ghetto but it worked.
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