Lost compression around 45-50the miles after break in and found crack from the edge through the fins and to the spark plug. Opened it up and seen it was cracked all the way through.. ordered a slanthead from kings to replace standard head along with a couple new gaskets.. hopefully no damage to piston may have rode it alittle hard for break in, running 16/1 mix and hopefully can add some pics of plug and piston soon. Seemed to be backfiring out of the carb at the end. Any thoughts or tips are appriciated