Hii! I have Nova Plus 21-3C .21 on road 7 ports engine and wonder if I can fit in 35 Plus piston liner with 9 ports. Will it make more power? One more thing my engine has only been use for half a gallon but i notice that the crankshaft wobble if you move it side to side or up and down. is this normal? My friend has got one also and his engine is doing the same thing. Mine has got ceramic rear bearing. When i run it i can hear a very rough sound like a worn out bearing. I saw one Nova model S721P at rcmushroom, is this any good?