Home › Forum › Ask A Member › "Newer" 25/35hp OMC compatibilities › Re: "Newer" 25/35hp OMC compatibilities
I had several engines with this magneto version (now I have in my garage two late ’70 22cu 25 hp and a ’76 6 hp.)
I had no problem for more than 20 years but I used them just a bit in the last 10 years… now, all the external coils I have appears to lost their power… I’m unable to combine a decent set of two for ONE motor.
Is it a known issue for these coils, as the well known ” age cracks” in the older internal coils?
Yes, it is quite common for these coils to crack. But, unlike the universal mag coils, most seem to work just fine with what looks like large enough cracks to create external leaks. I guess there must be another layer of some sort of insulation between the windings and the outer plastic casing. But again, it is best to leak test them with a mercotronic. The nice thing about the external coils is that leaks are easily heard and usually easy to spot visually while the engine is running/misfiring.