i have checked spark plugs by running it for alomost 100 kilometers.saw their was no change in colour. i am form nepal kathmandu and my bike is pulsor 220f.want to get proper tuning for my bike.currently i am running 3 turns out.when i drive it for some km i can smell some burning from upper side of the engine.i have also some problem with gear.can a faulty gear problem cause incorrect colour in the spark plug .plz give me some suggestions