Magic Spark???

[mjk123]

I have a strange problem:

2005 Yamaha 600 Triple

When idle, she is only firing on the outer two cylinders. Thinking I have a plug gone, I change the middle one but no change.

Here is where it gets interesting. If I take the cap off the plug just a little bit so that the metal is NOT touching, she fires!

So I unscrew the plug and I want to test for spark. I touch the plug on the metal bolt and nothing BUT if I lift the plug off of the bolt just a tad, TONS of spark.

WTF is going on?

Thanks!

 

[jwiedmayer]

You should probably change the caps. They unscrew off.

 

[tedgoesfast]

caps must be bad replace with rubber ones if still presists test coil