Saito 150 keeps locking up
Hey guys, I have a saito 150 that I've mounted on a Pica Waco and I know it will be the perfect powerplant for it if I can just figure out how to get it tuned right. I'm running an OS "F" plug and omega 10% fuel. She cranks perfect every time but when I give it some throttle,then it starts knocking and slams to a stop. It loosens the prop every time. I tighten the prop nut and the lock nut, adjust the needle and start her again and she does the same thing. I've leaned the needle to only 1 turn out but even that lean, it's smoking alot I know it just needs the proper needle setting and will be a good running engine. I just need some advice on where to start my needle adjustments.
Thanks