I realize this is an ATV forum...but I am already a member. Can anyone help me identify this 80-100cc Yamaha 2-stroke dirt bike engine? My buddie forgot what it came out of but we have it stuffed into a tiny mini-quad (Mini-Motto or something).

It's an air cooled engine painted black # 8UL-091478

Thanks!

 

I got the 8UL down to an RT100 now I just need to figure out the year somewhere between 1990-1998

 

that must be some privileged information. i can't find anything on the internet to help you out. must be a "dealer only" item

 

RIGHT!? What's up with thatt, there is barley any production information on the RT100 either yet it claims to be a highly successful bike