SOHC.co.uk Forums > CB750

Old coils.

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Johnny4428:
Here’s a serious dilemma! Is it worth refurbishing old coils? By the time I have sourced new ht cable, protective sheaths, numbers, epoxy resin etc, I am still going to end up with 47 year old coils. So the question is any advantage in repairing compared to replacing with new.

Lobo:
.... it surely depends upon how anal you are about original parts? Whilst I personally enjoy a good challenge, modern stuff is generally very reliable, beautifully made... and at reasonable cost that it’s sometimes sensible to know when you’re beat!
Coils - I’d shy away from given 40yo insulations becoming brittle, the environment they sit in, and that pushing any bike home is no fun!

blackeagles:
you could try checking (with a multimeter) the  reading(s) to see how good/bad they are before anything else.

philward:
I've got repo's on my 750k2 and had no problems (only 500 miles though) but had 2 out of 2 coils (M&P repo's) go duff on a K6 I built recently. If you follw Ash's guide, he considers that the standard coils are bullet proof and shows you how to test them before paying out for all the stuff to refurb the std ones. The cost reduces the more you do - I've done 3 sets now and so the cost compare to std replacements (few hundred squid?). I have a set ready to put on the 750k2 and a set for my 500k2 I'm building. The other set went on a recently sold K6 cafe racer.
I quite enjoyed the challenge and achievement of bringing what was effectively a throw away part back to new! (all thanks to Ash's guide mind you!).

SeanFD:
+1

I did the same. The only thing was the knowledge of where exactly to cut the body and the confidence to do it.

Also, do pay attention to teh advice not to cut too close to where the lead joins the coil; it is a pain to try to solder it back here.

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