I had one of my PM6's to not run reliably, it would fall on it's face when you tried to rev it up. I kept thinking it was the carb. I was working on it one night and took my drill and started turning the motor over and watching the plug for fire. It would fire at low RPMs and as I would speed the drill up it would start miss firing until it almost stopped firing at full speed on my drill. I replaced the coil thinking that was it but was not, then changed the cap and that was not it. I started looking at the points and the spring was almost against the base plate. What I found was the point spring was almost touching the base plate and I think what was happening was when the RPMs got up the spring would start touching the base plate more and more killing the fire. I think what I done was when I was installing the points as I tightened up the bolt that has the spring under it and has the cap and the wire going to the coil the spring cocked just enough to let it almost touch. I also took my meter and hooked between the point output and ground and removing the wire from the coil going to the points and on omes scale I turned the motor over by hand and you could see it make and break at several places as you turned the motor over instead of just once. I took a piece of mylar from I think a power transistor or maybe a triac and placed it between the spring and the base plate so it would not happen again and aligned the spring up a little better. The clearance on those small points was not much so the mylar will always keep it from touching again.
Brian
