I just ran my Saito FA 30-s with a new RMJ piston ring.
Saito FA 30-s with new RMJ ring and Boca Bearings.
Fuel====S&W 15% with 17% full synthetic
Prop====Bolly 9.5 x 6
Plug====Glo-Devil 4c special
Exhaust==stock muffler
Max rpm after 8 oz fuel===11,200
Max after 10 oz of fuel===11,410 rock steady
Idle=======smooth, steady 2,400
The compression was a little mushy before running, unusual for an RMJ ring, now it is finger chasing snappy. It quit a couple of times at 5,500 while rich, once peaked it never stumbled at any rpm.
Running at 6,800 rpm
A few minutes later it read 11,410 rpm
RPM with a Xoar 10 x 5.