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Italian moped engine

 For this build you will need a Morini engine

This is the only site i could find them on http://www.herdan.com/engines/

Its kinda expensive but what do you expect for a italian 2 stroke engine. These little engines are very durable by what ive heard.

Pipelyne Manufacturing                   Check ou the youtube videos below. also check out there offroading videos with this bike. They seem to be durable and built to ride like a dirtbike.
they have the kit.

(408) 279-2307                        Thats there page on moterized bike forum. Theres more pics and you can contact them on there.  http://motorbicycling.com/f25/ezrs-2nd-full-suspension-project-3160.html or  http://www.motoredbikes.com/member.php?u=2978
       
 

YouTube Video

YouTube Video