romeo
Addicted to ArboristSite
but... 996 of you you don't need them... it's not hard to tune with the factory coil...opcorn:
If its just a mildly modded saw you really don't need an unlimited coil. I just look at everything with a racers point of view. A 7900 can easily be made to surpass its ignition, especially if you race in small wood.
Its also easy to cloud up the tuning when you start raising exh port height. Tuning the rpm to the magic number won't work anymore to get your proper jetting.