Hey Folks,
This is my first post here. I have some help from a local mechanic. I gave him my old suzuki 400 in exchange for work on a warrior that I just got for $500. I got the machine spinning over nicely but have no spark. So now there is a new stator in it and he has juice to the CDI but thinks that is shot. I can't get a new CDI or even find an aftermarket one. Has anyone used a CDI for another machine and just spliced the old plugs on it?
Also, in searching here I see that the voltage regulator might be the culprit. Where do I find that?

 

The trouble with Yamaha is they wire loads of stuff that doesn't need to go there, into the CDI. Basically it needs a feed from "power coil" for powering the spark, a feed from trigger coil to give spark timing, a kill wire, an earth and a wire from CDI to ignition coil. Trouble is all the other wires from starter, neutral light etc, that Yamaha add in, as they won't work if you just fit a bare bones type CDI. It will be almost certain a CDI from another 350 Yam would work if the wires to it were sorted, but it would take a real expert at motorcycle electronics to sort it. It is possible Yamaha may sell a "work around" When the CDI for the late Honda 300 and 350 models became unavailable, Honda started selling a different CDI, along with a bit of extra loom which has sockets for the existing CDI loom plugs and plugs for the new type CDI.

Extremely unlikely that the regulator could kill the spark on a Yam, It does on Honda 450s but they have a weird AC/DC hybrid CDI, not a separate power coil AC type, like Yamaha.