I have a prob with my stock 1200. For some reason the spark plugs (2 of them the 1 and 4 pistons) keep fouling up black. The other 2 are fine and are free of any excess fuel burning.

I put a set of new spark plugs on and they fouled up real quick and were running #### within hours or driving. It really lost power and when we pulled the plugs out they were terribly fouled black.

I dont understand why they are fouling bad. The leads are fine points fine everything elerctrical fine. Why would only two pistons be getting such excess fuel?

Thanks in advance for any help!