The second plug will light once the engine is brought up to peak rpm. I set my Mintor 1.70 at 1500rpm idle which is slow enough and still very reliable. You will generally know a plug is gone when it starts to load up a little after long idle or throttle up from and extended idle manuver like after a 3 turn spin. So far no flame outs here. The people I know running the Mintor head on the OS are experiencing similar results like in the regular Mintor.

15% fuel works great. I run Cool Power and it does not gum up in the piston and ring and the header stays clean.

Wayne G.