did some searches and didnt find much. i just put a new piston in my bike, and new tranny gears. and it starts 1st kick when its cold every time so far. but when it gets warm, i kick my guts out just to get it started. and it pops a couple times before it will start. check the clearances before i put the motor back in, and the clearances were pretty tight. right on the line of needing thinner shims. is it just going to do this until i get it broke in good or did i do something wrong? i made no adjustments from my old head, and it used to be very consistent in its starting.