Anyone built a motorized bicycle?

[FastDoc]

I put one together a few weeks ago on a Trek mountain bike I bought from CL for about $50. I bought the '80' cc motor, (actually about 60), off eBay for another $125 or so. The kit came with everything needed except for one important item.

It was a fun project and took me about 3 hours. The bike rides fine, maybe 25 MPH as opposed to the 40 they advertise, but that's about as fast as you can safely go anyway on a bike.

I had to order wider pedal cranks because the stock ones don't clear the engine so the bike can't really be pedaled until that is addressed.

If anyone wants pics I'll take some.

[ImEazy]

I built one as well. $20 bike from a garage sale and a 80cc kit. Worked
great for me for a few trips from here to my folks. Than I let my son ride
it and all was lost. He disappeared for almost an hour and then I saw him
walking the bike home. The chain guide had moved when he was riding
it and the chain bent half the spokes. It is still ridable, but I won't trust
him riding it. If I mess myself up that is one thing, my son is a complete
other. He is very athletic (plays baseball and football) and I wouldn't want
to jeopardize that in any way. Here's a few pics. It will do about thirty with
me (175 lbs.) on it.

There is a thread about this somewhere as others have built them, but I
can't find it. I do agree with everyone else's advise that heavy duty
spokes are a must! The pics were before it was completed.

http://i156.photobucket.com/albums/t21/ImEazy/UTMC/bike2-1.jpg

http://i156.photobucket.com/albums/t21/ImEazy/UTMC/bike.jpg

My daughter gave me this sticker years ago. I thought it fit the bike well.
http://i156.photobucket.com/albums/t21/ImEazy/UTMC/tank-1.jpg

[FastDoc]

Yup, that was the kit I used. Fragile creations though, my chain fell off during the testing phase. No damage done, other than the chain, but I fixed that with a link from the hardware store.

[FastDoc]

Also, my motor has a pull starter and that's why I need the wider cranks, to clear it on the right.

[ImEazy]

Fragile they are. I saw the kit with the pull starter when I ordered this
one. It was a little more expensive so I decided I could live without it.
I bought this for my son to ride until he is old enough to get a motorcycle
permit. After his first ride I don't know anymore. The kid can't seem to
touch anything without something going wrong or breaking... laughs.
Maybe next summer he will be able to take care of it. Time will tell.

[FastDoc]

My (ex) stepson could break a hammer if given the chance. He was totally heck on machines that he did not have to repair :evil:

[ImEazy]

That's funny man! I learned when I was young to stop touching anything
that belong to my father as he would do nothing more than kick my a$$.
My son on the other hand just doesn't get the concept. I love him more
than anything, just can't afford to let him trash everything he touches!
One day I hope he gets it...

[Q]

I've built several motorized bikes with the Chinese engines. Here's one I built for my daughter a few years ago.
http://img.photobucket.com/albums/v499/QDM/mbike4.jpg

[ImEazy]

That is cool Q. The baskets give it a special touch for sure.

http://img.photobucket.com/albums/v499/QDM/mbike4.jpg

[FastDoc]

I like the paint job, also!

I use mine mostly for going to my neighbor's (3 miles away) shooting range, and to the mailbox (1/2 mile away). It's so much fun! Loud and a lot of vibration though. I have maybe 150 miles on mine. Hoping it will speed up a little when I can go to 32:1 or something.

[donkeymule]

Those kits look like they would be alot of fun!