Kind of hard to decipher your question but.....

Plug(s) fouled black can mean fuel too rich or oil is fouling them.
Generally speaking.

If it were me, and I was *certain* some diesel was put in the gas
tank, I'd drain it and whatever else I could (fuel filter, hoses etc.
... good time to inspect fuel hoses!), clean the plugs, put it back
together, put in new gas, run it, clean the plugs again (if needed),
then hope all is well.

There may be other things needed to be done, (purge the fuel injectors
??) but I'm not sure of that. As I said. It's what I'd do. ;)

You wrote:

> ...... running without the cat forward, get that.

??

Neil.

On Tue, Jan 13, 2009 at 4:29 PM, Tieitup <tieitup@gmail.com> wrote:
> Running an unleaded 2.1, if someone tipped diesal into the fuel, would it
> eventually clog the plug, turning it black. it seems like some shitty fuel.
> Rough runnning 2.1, missing power, running fuly through rpms through, 5
> speed.
>
> Very, very black fouled plugs, running without the cat forward, get that.
>
> Thoughts and opinions are welcome
>
> @dam
> 88 westy 2.1
>