So I've decided to start using better oil in my mix and im running 45:1 instead of the 40:1 I was running. I pulled out all my saws today to dial them in. I put the tac on it and had a hard time getting the rpms up to the recommended max 13k. I did get it there but I had to hit the throttle to WOT where it was at 10k, then open the high. When it got to 13k it was kinda surging. "Wawawawa". I rebuilt the saw about two years ago. New Piston and cylinder, seals, carb rebuilt, all lines are new. I did replace the coil with an aftermarket 290 coil. Do you think the Chinese coil could be doing this? It runs great at 10k it just doesn't cut very fast.
