Ignore the metallic rattling and any smoke (shockbolts and exhaust paint) at higher revs it sounds a little on the "raspy" side ... While it seems to only like being taken up in revs smooth and slow, I think that's only because of the way it's sitting. I'd love to be able to actually drive this to see if can handle being loaded and whether it's worth messing with. I still have the 4-bolt head Sunl engine sitting untouched. Also need to dig up a ballast resistor for it yet--neither engine had one.
http://youtu.be/s_iw_aaH2ts