Hi I've got an MC21 that used to fire up first kick,then it gradually got more and more difficult to get it running,it'll bump ok but not kick start.Thought it might need a top end rebuild and this was done,new pistons,rings,plugs the lot.Now getting really good compression but still it won't kick start.when bumped it runs great on the rear pot but seems a bit hit and miss on the front.Thought it might be spark plug so fitted another new,not that so changed the coil and ht lead and still have the problem and that's where I'm at.Any suggestions what I should do next or what the problem could be would be a great help so over to you,cheers.