Originally Posted by Sirio2127

Ryan I have a little advice. I am pritty shore the tuned 21 ninja has ceramic bearings in the rear. With all engine's but more so with ones with ceramic bearings during the barke-in procdure from first start you must be very carefull not to give fast excelaration you have to have very smooth throttal movements and alway's at a ritch setting. Ceramic Bearing have a bad habbet of skidding the balls inside the outer and inner races during the very early stages of brake-in. When that happens it damages the bearings very very early on befor the bearings and all moving parts have time to set there clearences. I am no expert but I have a feeling that may be part of your prob now. I know i have done it my self many times. I am much more carefull now to make shore i do very smooth throttal inputs on a fresh engine or even after replacing parts like bearings and conrod's. I hope you get it running agen soon. I knew the engine was not running like it should and i think once you get it sorted it should be quite good just don't give up yet. Best Regards Jeremy.