2012 Pro Fouling Plug

[chicago]

I have a fouling issue with the mag side, last time this happened the PTO side was almost white, no codes and a couple of blimps of the throttle would clear for a period. I switched the fuel chip to Ethanol and the sled ran fine with no fouling after 200 miles. I installed a MBRP can.
Any positive thoughts.

 

[CO Powder]

How many miles on the top end? Have you checked compression? The way the 12's were mapped and the oil was turned way down from the factory I would expect the plugs to be very light when running "normally".

Have you removed the exhaust valves to look at the pistons and rings?

Probably needs a top end...

 

[chicago]

1400 miles with compression of 120.

 

[Hansen13]

Yup I agree, take the exhaust off so you can take a look in at the pistons. I've been lucky with my 12, still runs great! Doing my preventative maintenance this summer.

 

[Norway]

Are some threads here about issues related to spark plug caps. These engines do vibrate some and this can cause more wear inside the caps, giving your cap/plug connection poor performance.

 

[boner]

injectors, we have had this issue with two sleds now. injectors fixed both of them.and its easy to do yourself

 

[Norway]

injectors, we have had this issue with two sleds now. injectors fixed both of them.and its easy to do yourself

And what do you do with them?