Now, ive read this thread http://www.motoredbikes.com/showthread.php?t=10392 and the 'reading your sparkplug' bit and had a bit of a look, mine looks along the lines of this http://www.verrill.com/moto/sellingguide/sparkplugs/plug_carbon.jpg Carbon Fouled. Now it says adjust fuel air mix, but adjust how much? how do i get it in the right place, when i screw in the little fuel/air screw am i making it richer or thinner? Can i tell by what sounds the engine is making if it needs to be in/out? Currently i have it 9 half turns wound out, from having it as tight as can be by hand.