Inconsistent Spark, Don't know what to do next

blackpanther300 · Mar 11, 2023

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 · Mar 12, 2023

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 · Mar 12, 2023

Would this be the genuine 87 key switch?
https://www.yamahapartsmonster.com/oemparts/p/yamaha/1uy-82510-09-00/main-switch-assembly
I'd rather not pay so much for something like that, but if there's no other choice then alright

blackpanther300 · Mar 13, 2023

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

https://www.partzilla.com/product/y...D6OJmY7KblSghwRVHxIfvB5bEEOEXrE0aAn1rEALw_wcB

ag2560 · Mar 15, 2023

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

blackpanther300 · Mar 17, 2023

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