Kostas, I've set one of these up for a guy.

Firstly, the adjustment limiting collar for the low speed adjustment was set wrongly, not permittting the adjustment to be made sufficiently lean. Once this was sorted out, the engine was easy to tune and settled into a nice 2000-2200 rpm idle and good transition. It's pretty quiet too with its stock muffler, which is a good thing.

Its power was OK but not outstanding. It pulled about 11,300 rpm on an APC 12x6 and about 12,200 on an APC 11x7. It's not even going to get close to 13000 with a 12x7. That's Jett .90 territory!

The engine has been otherwise reliable and has delivered good service to its owner.