Ran a couple different 4 stroke plugs. Seemeed the same. What I did find was that if I kept the glow drive higher than the green on the meter, about 4 amperes, it worked a lot better. Green quits about at 3.5. And if i went to 4.5 it was better still. The plug jut isn't hot enough. I burnt up an idle bar plug doing it. Didn't respond any different for what it's worth. Does any one make a glow plug that will take a lot more juice than normal?
And I never did get it to work with out constsnt drive, not good enough any way.