DIY Predator powered BMX

[wheelbender6]

Saw this for sale on my local craigslist. Unfortunately, it has no pedals. It's very clean and simple. Offset mounted motor drives the rear with a belt and idler clutch. No jack shaft.
"THE PREDATOR"motorbike. Built w/ vintage 60's style but with today's technology, 79cc engine, belt drive, 40 mph+......low hours. $1200 or best offer........I will not answer e-mails w/o a phone number, please

http://images.craigslist.org/01313_dsQRhvuVpHv_600x450.jpg
[img]http://images.craigslist.org/00D0D_2hT5PYIwIE7_600x450.jpg

 

[Greg58]

Looks like he did a good job, if he could of somehow keep the pedals it would be better. He used the garden tiller design of belt tension, I wonder what kind of rear rim setup he used.

 

[mat_man]

I wonder what kind of rear rim setup he used.

Lowracer has done something like this.

How to make a V-belt drive sheave.

http://www.motoredbikes.com/showthread.php?31691-How-to-make-a-V-belt-drive-sheave

I think this motorized bicycle has 20" wheels on a 24" frame.
The front brakes rub the sidewall of the tire. See pic.
No back brakes.

Sort of like this:
The Honda A-Type, Honda’s First Product on the Market (1947) bicycle engine
http://motorbicycling.com/showthread.php?t=13250

 

[Greg58]

No rear brakes would be a deal killer for me, I'm older and smarter than I was when I used to do those kind of projects. My first motorized bike project was a 3hp Briggs in frame with no pedals and no brakes at all, except my converse all stars stuck in the back of the front forks as a scrub brake!