yes they are the worst engine that ive ever had the misfortune of owning in a heli..

BTW cambo. what fuel were you using as i was trying 20 percent fuel but i had exactly the same result you mention above but then my other heli pilot mate said 'do you want to try my 30 percent' so i tried it and the engine was much much much better.
it ticked over quite reasonably (tho still not perfect) and went through the whole tank..oh and i didnt put any more compresion spacers on the head. it just has one ring..

has any one else had good or bad results on these engines with 30 percent fuel ?????