Chainsaw Repair

You are correct a separate coil pack but also a different flywheel part number. I do not know if there is any real difference in the two flywheels except that the one used for the 'G' models may have different machining on the rear to make room for the generator. There are other 'G' model saws that do not use a two element coil like the 262XPG so do not think that the existence of the generator dictates a two element coil. IIRC sometime in the past I used the 'G' model flywheel on a non 'G' saw and everything was fine. 

Would be interesting to know how much voltage the generator puts out. I dig around and see if I can find out. My guess would be between 6&14 volts.