im hoping someone can help me with this............ i got given a mini moto that hadnt been run for a but a year so i put new fuel in it and after abit of fudging about it started and ran fine, after 2 weeks the spark plug kept popping out so i replaced the head as the thread had gone but after putting a new head back on it wont start!! i thought it may be carb related so bought a new 1 but its still not having it, if i put some fuel in the carb it will run for a second til it has used that fuel then wont go again, ive got a spark and short of putting a new engine in im stuck for ideas!!