First put a 50-50 mix of gasoline and TCW3 oil in the cylinders if you can turn the motor upside down so you can get the mix into the upper main bearing, grease up the lower unit , I like to run NGK AB6 plugs in my speeditwin. I’ve never taken one apart before running if it feels smooth …. that’s my two cents worth 🧐
Rotary valve Johnson’s Rule!
