I've just been instructing a guy who put one of those on his "trainer". He has been jumping through hoops trying to get the thing to run reliably.

He has helicopter experience and is comfortable working with engines but this one has been a trial. Removing the limiters didn't work. It would finally take a setting but would start to surge. It turns out that the optional needle location setup was killing the settings.

You can use the remote needle arrangement or pull a fitting and put the needle in the carb. The engine came with the remote needle setup I think. And it turned out that the fitting in the carb that was supposed to seal the unused needle structure hole leaked. It was just a wide headed bolt with a tiny, badly cut, flat "plastic" washer. The washer was supposed to seal the bolt hole. It was crinkled, too narrow, and not flexible worth spit. When he moved the needle to the carb and threw away that "seal" the engine ran better, but now it seems the low speed needle might be a problem. We've only just messed with it a short while (maybe a half-hour) and it seemed to be in the right range, but a good ground setting doesn't work that way in the air. I'm not positive the engine has broken in good enough or if there is a leak somewhere else. But it's been a major pain so far. I'm guessing there is still something wrong with that engine because it really doesn't seem to have the power for that Funtana90. I've only had the opportunity to check the headbolts, no time for a full checkup. BTW, one headbolt was took a quarter turn. The rest were tight.

The guy is learning on a Funtana90. No lie. It's his first airplane. But he's doing great. Only problem is that we've only gotten one engine run good enough that I had him do landing approaches. He did a couple of decent approaches and one good landing. Every other flight, I landed the sucker deadstick.

I've dealt with a couple of Evolutions on the P51 trainer and they weren't anything to brag about until the limiters were removed. They worked out good after that. But this 100 has ruined that record for Evolutions as far as I've seen.