Thought I'd pass this info along. I recently finished my annual a month or so ago and as with most annuals, had a component that needed replacement. This year was the mags. They had a good amount of time on them and the pins were worn to the point of being unservicable. After shopping around, I found some "rebuilt" mags for what seemed a reasonable price, about $400.00 less than Savage Mags in L.A. wanted to rebuild them. That's alot of gas so I jumped. Upon installation, I found that the engine was hard to start. Normally, I prime for three-five seconds, cycle the throttle and hit the start button. A quarter turn of the blade and we're off. Now, It takes upwards of a minute and a cough or two before we start. This has resulted in a flooded engine and worn down battery until I learned how to accomodate. Better when warm but not great. I am uncomfortable going into remote places not knowing if the engine will start. BTW, We made no other changes to this engine. Here's what we discovered: Kelly-Aerospace rebuilds these things and has had them approved by the FAA. The one thing that they don't disclose is that they do not use genuine TCM parts. They use some other coil/capacitor combo. The Kelly coils have an impedence of 7-11,000. The TCM coils have an impedence of 11-14,000. While the Kelly mags make spark and satisfied the minimum for the FAA, in real life THEY DON'T WORK. I am in the process of replacing my coils/capicitors with TCM parts and voiding any warranty with Kelly. There are several IA's in the area that have discovered this independently and are trying to take action collectively. Hopefully, this will save someone the difficulty and frustration that I have experienced. Sometimes, saving a couple of bucks isn't worth it. The replacement coils/caps are about the same as the difference I was saving. Caveat emptor!
