SOHC.co.uk Forums > CB500/550

again different coils

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duzatun:
ok so it has been said that we can put later model coils into say my 78 cb 550 will the coils out of a 1986vf 500 interceptor work in my 550

matthewmosse:
depends as far as I know most coils for points are pretty much the same and are interchangable. cdi coils will work but not last if fitted to points system and visa versa. not always true as there are other variations - bmw's seem to have different again etc etc.
Specifically has the donor bike (vf500 interceptor) got points or cdi ignition I'd geuss at cdi. Although I haven't needed to buy any I think m&p and their ilk sell pattern coils in 2 resistances, one for points, one for cdi at about

Bryanj:
As has been said most modern coils with replacable wires are for CDI or "electronic" (NOT the same ignition and frequently have a 3 Ohm primary resistance.

This is lower than original spec of, I think, 5 Ohm which increase the current draw, in turn shortening the contact breaker life and reducing the battery charge. All of these can have an annoying and deleterious effect.

duzatun:
thanks for the info guy,s
as i am having problems with breaking down at 2/3 to 3/4 throttle and have been through
valve clearance
timing
points 
advance
and all these have been set
carby,s have been done
i have new condensors and points on the way once i have installed these if the problem persists i will appreciate any advice on what to look at next.
due to the fact that my mate had installed pod filters and a jump from the 550 pistons to 610 kit i may also be looking at bigger main jets have no idea on the size to use hear
they are 78 model carby,s and the needle and seat jet only has 2.0 written on  it wich i would presume is 2mm is this correct

matthewmosse:
I think jetting is the issue here, tried conical filters on my cb550k3 '78, was a right swine to start (k3 was never as good to start compared to the 500's in my expirience) but this was worse than usual. I would geuss that richer than standard jets would be needed, cann't say what that would be though. plug chops are the order of the day to see if the bike is running lean, or ideally a dyno run. Are the carbs off a k3 or f series bike? I think the k3's were jetted leaner to give better economy ???

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