Chainsaw Repair

I do not know of any schematics for ignitions that have limiting coils.    Besides those coils are all incased with epoxy and I doubt that you could get into one to modify it in any way. 

If you could get into one of the newer limiting coils and since these ignition systems are solid state devices there is probably a component in there that could be changed so that the RPM range could be made to go higher.