I suppose I should start using OEM replacement coils also. I just wasn't so sure that the new OEM ones were any more reliable nowadays. I was wondering if the aftermarket imports had cornered the market and were also producing the OEM coils as well. If there are no reports of junky coils with OEM then I'll just go that route in the future.That stinks to hear that you're having coil issues, I've not had them go bad with my F series lawn boys. I'm a firm believer in using OEM parts whenever possible, but $50 for a toro coil is a little overboard in my opinion. I'd also like to know where to find reasonably price replacements that aren't complete junk.
Oh yes, love your 10525!
Edit: I'm wondering if the excessive heat down here in west Texas is a coil killer. It was over 100 degrees when this last one bit the dust and I'm thinking that the conditions were similar for the others that died. Anyway, I would think that as long as the flywheel cooling fins are kept clear overheating shouldn't be a problem, and I keep my mowers pretty clean in that area.