I built a 49cc, w/NTTC carb for my Grandson. For reasons I won't go into, he removed the head and put it back on. I found a problem with the spark plug cap which I can fix. But can anyone tell me what to torque the head bolts to? And will I need to replace the head gasket or can it be reused? Given what he has done, anything else I should be aware of or watch out for? Don't know what I would do for answers without the kind and helpful folks on this forum.