yeah.. i tuned the carbs bout 500k's ago was always really good after then.. this problem with fouling plugs just started on saterday 2 days ago... thats when this running rough prroblem started.. it done the same thing as since saterday whern the plugs fouled up.. they are real dark black so yeah it is fuel.. but i dont know if it is a spark problem under load or anything cause when i rev it hard on the spot it is ok.. only when i drive it it happends.. it has really driving me nuts of what it is i mean.. one 200m drive and it has done it.. didnt even get to drive in 2nd properly i am thinking it might be carbs but also think it might be something else it is very weird.. it feels like it is not egttin enuff spark out of the plugs.. 1st revs out well but then 2nd is really bad.. i guess you can say it is a phantom problem if anybody may know what it maybe it will be very helpful... oh yeah ti does missfire afterwards when i drive when i put a load on it.. it dont haveta be much of a load either this is all after i have put it in 2nd.