Sorry, I don't have the part no. It was probably 4 yrs. ago that Stihl came out with an "upgrade kit" which consisted of the new coil, new flywheel with advanced timing (but not as advanced as the Brad Snelling mod.), & new carb. The kit was about $89.95. If you bought only the coil, it was a few bucks more than the kit.Got a part number and a price on that updated coil? Let me know.