Much as I hate to say it, you will probably be better off with a more common UL motor for this one.  

 

Thanks to everyone for the info.  Looks like you're probably right about the 2-stroke for the Airbike, probably a 503.  

 

Cheers,

Rusty (Airbike wing kit materials shipped today) 

 

I concur.  I've been looking for a good replacement for my 503  (Kolb Twinstar) for years.  When it flys again, it will probably be with the 503 that has powered it for 800 hours.

 

Tracy