interchangable CDI modules

Are the CDI boxes interchangable between an '85 VF500F and an '83 VF750S? Part numbers are different, but it looks like the wiring/plugs are the same. I am suspicious of the igniter modules on my VF500F, but can't locate any replacements for an affordable price. If anyone knows of a workable swap, I would sure like to hear about it!

 

Doubtful...if the part numbers are different.

I haven't heard of a substitution but I have read an article on restoring CDI spark boxes.

Here is a link to the article by Clifton Koch:

http://users.rcn.com/kochc/moto/spark/ig_repair.html

 

How much is affordable? I have a few spares.

 

If the OP isn't interested I might be, being the parts pack rat that I am. Thx!

 

I asked you if you wanted anything else when you bought the carbs! You just can't resist too long, huh (or "eh" up here)?

I do have just about one or more of everything. Two people are looking at the bike this weekend and the parts are going with it, so speak up now people!

 

Yeah, tough to overcome my inner pack rat for NLA items!

 

I am sure if enough people wrote emails to Dyna they could fab up some CDI's for these old bikes for not too much.

 

I did write to them awhile back. Unfortunately they are not interested in pursuing this right now - at least for the VF500F.

They did forward my request to the R&D Department...

 

I have a set of VF400 CDI's and look like the ones of VF500 although the p/n if I recall well are different. The 400/500 Dutch manual gives for both CDI's the same degrees of advance at slightly different rpm so I believe the 400 CDIs are a compatible swap but probably more difficult to be found.

 

I need to determine that the CDI box is the problem. I think I may have another gremlin to kill off first. Replacing all spark plug wires and caps tonight. Also need to take a closer look at the kill switch. I'm a little suspicious of that too.

 

Sounds like a good plan. Let us know how you make out.

 

+1 on the kill switch, but the whole current path needs to be investigated.
I would start with ignition fuse then go to Bl wire, Kill switch, Bl/W wire.