RE: Saito 125 poor performance problem
Hiside,
You may want to mention what brand of prop your running if you havent already. Were seeing that the 125 will turn a MA 16x6 at 9k where the APC 16x6 is in the low to mid 8's. APC is a more efficient prop overall.
Also I dont know where the differences are but my Saito 120 will swing an APC 16x6 a 1000 RPM more than my 125's will.