SOHC.co.uk Forums > CB750

Wiring problems with my 1977 CB750F1

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SteveD CB500K0:
It will work fine with the standard coils and plugs.

Some like to fit the Dyna coils as well - probably not necessary unless you plan to go racing!

theriddler:
Somehow I don't quite think so, after the effort I've spent... as well as some bits being unobtainable -  ;D

notobikeparkingtax:
I thought I'd throw my 2d in here. I had a Honda '89 CB900F a while back, lovely bike, ran beautifully except for an annoying 'stumble' at 3000 rpm. After reading up a bit on it I bought a pair of green 3ohm coils from Z1enterprises. They worked out considerably cheaper than buying the same coils from a UK seller, arrived really quickly and were well packed.
Fitted them, fired it up. Those big, fat juicy sparks were doing such a good job that it was idling 1000 rpm higher than with the old coils. Took it for a spin and it was like a new bike. Much smoother, better pick-up and more powerful all through the rev range. And the stumble had gone completely. Major result.

Those old coils were from 1989 and had clearly either deteriorated or were just plain inferior to the Dynas, I'd thoroughly recommend them and am only waiting for a better exchange rate before getting a pair of the black 5 ohm coils for my K7.

SteveD CB500K0:
True.

But your '89 CB900 had a much bigger alternater than the 70's CB750s.

There is a lot of discussion on the US site about using low impedence Dyna coils on a CB750. Some like it and some don't.

I believe that the standard coils are 6ohm (?). The 3 ohm Dynas will draw twice the current from your electrical system - I'm not sure but I think that Dyna do a range of impedences.

theriddler:
Hmmm - interesting. It would seem from the above that possibly I could get Dyna equivalent coils to the standard Honda units??? The standard units being approx... 5ohm??? So then if I wanted to keep things fairly standard, I could just swap the existing coils (rather ancient) with nice new Dyna 5ohm units? At hopefully a less price!

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