clean the carb out and before you check the p[lug you got to do a wot run then turn the engine off immediatly,post another video checking the sparkie colour. tune the top end by finding the top speed,highest rpms then back it off a 1/16 of a turn, the bottom end is tuned by tickover and how responsive it is between tickover and a 3rd throttle,check by blipping throttle,make sure it doesn't bog for a second before it revs.



