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Old 02-16-2014, 06:57 PM   #16
Creation
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I put a chainsaw engine with a Gatorade gas tank on my bike when I travelled across the USA when I was 18. Wood mount attached to the bike holding the engine and a bmx peg with grip tape to drive the wheel. Got me up to 40 mph and saved 2 weeks off my trip until the mount broke and I didn't see myself carrying the engine to the next town. Full throttle always and died when I came to complete stop.
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Old 02-16-2014, 07:04 PM   #17
Boon Booni
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I grew up riding this contraption that my Dad made for my brother.



Pretty friggen awesome, and pretty figgen dangerous.
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Old 02-17-2014, 03:05 PM   #18
lockyv7
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This is one of mine,








and a couple more i built.


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Old 02-18-2014, 05:55 AM   #19
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Somebody (not me) should take one of these on a long distance trip, TAT or something. Approach it like a backpacking trip, everything you need on your back.

Doable?
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Old 02-18-2014, 06:03 AM   #20
gravityisnotmyfriend
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I'll have to see if I can dig up the video - but my uncle built a motorized bicycle about 20 years ago. It was a really brillaint design. He basically built the back half of a go kart and hooked it to the seat post on his bike. Then, he built a fiberglass shell around the engine and axle, so what he ended up with was a trailer that pushed his bike.

The big upside was that he could simply un-hook the trailer if he wanted a regular bike. But, with the trailer on, it was good for 40+MPH. And had a pretty good sized cargo area.

It wasn't entirely legal. In WI, it can only be considered a motorized bicycle if it is capable of speeds under 30 MPH.
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Old 02-18-2014, 06:28 AM   #21
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Quote:
Originally Posted by Skooter View Post
Somebody (not me) should take one of these on a long distance trip, TAT or something. Approach it like a backpacking trip, everything you need on your back.

Doable?
I'll be jumped on for this... not with a China 2 smoke.
Do some research. Break in oil ratio is 25 to 1 iirc and running ratio is 35 to 1.
IDK if its changed but many of the early China engines had bronze or brass wrist-pin bushings=short service life.

Two forums.
http://motorbicycling.com/
http://www.motoredbikes.com/

Staton builds gas powered wheelbarrows that can transport insane loads/weight.
They offer this gear box for the rack mount kit. It is heavy but can be fitted with silly power.
It has a free-wheel on the engine drive side.
http://www.staton-inc.com/home.shtml

Golden Eagle is very light weight, offers no freewheel but will get VG MPG.
I built one years ago using the Robin-Subaru 35cc engine. Might do another.
Ain't cheap for what it is BUT the Robin-Subaru or Tanaka engines live a very long life as does the belt drive.
http://bikeengines.com/ (they have a forum now)

Some fellas like a jack shaft so the derailer gears can be used which might be good for very steep grades but we are talking bicycles.
Remember, a POS bicycle at 30+MPH! Not for me.

N-Joy looking over those three forums.
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Old 02-18-2014, 04:01 PM   #22
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I've built several Pacific cruiser bikes with the 66cc Chinese engines and they all worked OK. Plenty of power, too much power for a bicycle. 35 mph on a bicycle is faster than one can safely run IMO.

Also built one using an old Bianchi Mt. bike, a Honda 4 stroke 35cc weed wacker engine, and a Golden Eagle belt and wheel pulley. Good gas mileage, quiet, much less power than the Chinese 2 stroke engines, which may be a good thing.

Best option is to get a moped and forget powering a bicycle.
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Old 02-18-2014, 05:02 PM   #23
gravityisnotmyfriend
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Best option is to get a moped and forget powering a bicycle.
Which is why I stopped considering building one. I have my motorcycle endorsement. Once the novelty wears off I can't imagine driving a motorized bike over even my most under powered motorcycle.
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Old 02-18-2014, 06:07 PM   #24
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Imagine?

130 to 200 mpg.
Ride most any bicycle MUP. Many have no stop signs for 10s of miles.
Park & lock at a bicycle rack in the crowded inner city or park it inside the work place.

The deal with gas powered bicycles is to lace in strong rims with Sapim, DT or Wheel Smith spokes.
Use a bicycle that is fitted with disc brakes... no rim brakes!

Ready to roll a gas powered bicycle will curb at about 50 to 60#, 30mph and about 150mpg.
They are fun to ride and harass roadies.
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Old 02-19-2014, 03:10 AM   #25
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Quote:
Originally Posted by hugemoth View Post

Best option is to get a moped and forget powering a bicycle.
This. I built one and it was neat, for a few days. Then stuff was breaking and I was over it.

For the same money you can buy a decent moped that will be 1,000,000 times more reliable.

I ended up selling the motorized bicycle kit and getting one of these:



It was a much better choice and faster for the same $$.
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Old 02-19-2014, 03:28 AM   #26
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This. I built one and it was neat, for a few days. Then stuff was breaking and I was over it.

For the same money you can buy a decent moped that will be 1,000,000 times more reliable.

I ended up selling the motorized bicycle kit and getting one of these:



It was a much better choice and faster for the same $$.
That looks good!

How far can you pedal it w/o engine power?
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Old 02-19-2014, 05:00 AM   #27
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Hey, I just like the idea of putting engines on things. Couple weeks of fun for under $200. I've paid a lot more for a lot less. My bicycle doesn't get ridden anyway.

Not seeing a downside here.
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Old 02-19-2014, 06:06 AM   #28
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Originally Posted by Skooter View Post
Hey, I just like the idea of putting engines on things. Couple weeks of fun for under $200. I've paid a lot more for a lot less. My bicycle doesn't get ridden anyway.

Not seeing a downside here.
At the very least make sure all the spokes are tensioned well.
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Old 02-19-2014, 02:32 PM   #29
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There's some pretty cool mopeds out there.



You might even get the sweet 1976 Austrian owners manual.


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Old 02-19-2014, 05:57 PM   #30
Adios Pantalones
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Originally Posted by lockyv7 View Post
This is one of mine,








and a couple more i built.


Nice cruiser there!

Around here we call them "Bro-Peds" Hey Bro, Nice flat brim!

Or if DUI inspired, "Likker sikkles"
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