GS 500 Coils on GSX400?

[Guest]

Hi,
Will Coils from a 92 GS 500 work on my 84 GSX400?
they are black and smaller in diameter then my gray coils. I would like to use them since they will be easier to mount on my custom build.

Thanks
Eran

[tom203]

Why don't you check primary resistance on the gs400 coils and compare to the 92 gs500 ones. Remember that ignitor was designed to work with the stock ignition coils- a little variation shouldn't matter.

[eran_k]

How do i check that?

[Gorminrider]

How do i check that?...actually,that's a good question I find it's pretty difficult to trust a cheap ohmeter to tell between fractions of an ohm....another way, would be to compare the voltage drop by adding another load "in series"...what I mean: wire a headlamp or a similar low resistance load "in line"with-in "series"with the coil to be tested and then test the voltage "across" the coil (the leads touch at each of the two places you connected it in the series). This might give an easier-to-see number on the meter. I haven't tried it on coils and a headlamp is maybe not the best extra series load but everyone's got one around somewhere... but the idea of voltage drops is one I use a lot.

The basic fact is that the sum of the voltage drops in a series of loads = battery voltage and of course the wire and your connections also have voltage "drop"s so you need have these tidy and consistent test-to-test.
It's pointless to measure voltage drop across each coil alone of course, unless you are concerned about the wires going to it.
You can go here too, but I guess you are past that?) and see what these guys think is the coil for an 81 gsx400

http://www.cmsnl.com/products/coil-assy-igni_3341044x50/

and compare it to what I found for an '89 gs500 (sorry, I got the year wrong)

http://www.cmsnl.com/suzuki-gs500-1989-ek_model13449/coil-assy-igni_3341001d00/

or go here and do comparisons from scratch

http://www.cmsnl.com/suzuki-motorcycle_model13053/

Mekanix has been making a wiki on these here:

http://www.thegsresources.com/_forum/showthread.php?t=205995