At the moment i m using 17/22t pinion and 59/56t spur. my setting right now is 1.0mm spring adjuster from the tip of the thread and shimming my inner bearing just enough to give it a gap for free rolling clutch bell and my end play gap when measuring using Kyosho pinion gear removal tool from the front is 0.4mm. I m also using the stock gray clutch shoe and s6 plug with 16% odonnel fuel and Sirio efra 2611 pipe. Somehow the engine just doesnt have enough low end torque however from mid to high end it is ballistic.