Yeah Thomas:
On any given day at my field, about 1/3rd of the flyers are having engine troubles.....with a wide variety of brands. Mostly it's inexperience, taking shortcuts, poor tank plumbing, not knowing how to adjust the engine properly.

And to Mike:
I heard at Toledo from RCS, that he believes they are working on the 105 single. I would think the only holdup would be if it vibrates too much. The 210 uses the 80-sized piston and a longer stroke crank. I assume the 105 would also be a stroked version of the 80-single.