Well, NB 30% sold me a used trx .15 pro, I kind thought it was a dog, and got hot easy. On a maxx
I experimented with plugs, and fuel. I am running a 20% nitro with 16% oil now. Now, it's a rocket. (18t CB).
For being a .15 I'm sincerely impressed. Once I got it tuned for my elevation (he's from colorado) It runs like a champ. It starts quick, will idle indefinetaly and stays about 240..it peaks about 270 tops immediately after a high speed run.
Keep in mind this is a USED engine. Honestly I think the TRX .15 pro is underated for a .15 I would definetaly buy another.