hey 2 questions coming here, 1 is my mates bike, last night he rode it to my house, throttle cable snaped so he left it here, we put a new one on today and when i tried kicking it, it was like silent, it had compression but no sound not even a puff outta the exhust, after a few tries no its like stuck, like trying to start in gear, when u do crank it not even the fly wheel moves... pretty random is this engine just carked it? next is my bike, ported the manafold and the head, i think abit of metal dust could of got in the head hey, what kinda damage could this do? if so what should i do?