Don't remember the model #. It is the 2nd generation series though. They are all over ebay. Requires a fair amount of work to convert. The mount came from Carr Precision (nice piece of work!). I removed the baffle in the muffler to flow better. I have to see how it will fit on my Rearwin Speedster which is where I want to put it. Seems to run just fine upside down. I may get another at some point just to try some hop up mods. Would like to get one to swing a 18X8 Zinger @ 7000rpm. I'll post some pics in my gallery soon. Busy working on 2 Tecumseh conversions at the moment (49cc & 138cc).