Inconsistent Spark, Don't know what to do next

[blackpanther300]

Just as the title says, I have inconsistent spark. I have a 1987 warrior 350 and whenever I hold the start button, it'll spark once and then not spark again for another 10 or so revolutions. I've replaced the cdi, stator, ignition coil, spark plug, and also got a new key ignition switch from Caltric. Also the fuse near the starter relay is good. At this point I really have no idea where to turn. My only idea is a bad ground or bad wiring somewhere but everywhere looks fine except for 1 spot in particular. There's this small black wire here coming out at the back end that isn't connected to anything, as well as a bigger black wire connected to a ground pretty close to it. I've tried connecting these 2 wires together to see if that would help, but the spark didn't improve. Does anyone know any possible cause still? At this point, I'm think of replacing the wiring harness too

 

[ag2560]

Get a new key switch from Yamaha on the 87 it was different than the other years. They lump it in 87-95 but it was a one off piece.

 

[blackpanther300]

Would this be the genuine 87 key switch?

Yamaha 1UY-82510-09-00 - Main Switch Assembly : Yamaha Parts Monster

www.yamahapartsmonster.com

I'd rather not pay so much for something like that, but if there's no other choice then alright

 

[blackpanther300]

It seems like this is also the same thing for a bit less?

https://www.partzilla.com/product/yamaha/1UY-82510-02-00?gclid=Cj0KCQjwk7ugBhDIARIsAGuvgPbe1DMoxqlFoj8AKiv_g92D6OJmY7KblSghwRVHxIfvB5bEEOEXrE0aAn1rEALw_wcB

 

[ag2560]

The only key that works for the 87 is the oem 87 switch.

 

[blackpanther300]

Alright just bought it off of partzilla. The yamaha parts website wanted me to spend $20 more on shipping. I'll give an update when it arrives and I install it

 

[abrewerjosh]

Get a new key switch from Yamaha on the 87 it was different than the other years. They lump it in 87-95 but it was a one off piece.

Check the fly wheel I had the same problem with mine Ii had changed fly wheel changed it back a wala

 

[blackpanther300]

Getting an OEM key switch did the trick. The spark is perfect now. Unfortunately though there are other issues to attend to