Hi, ive just found out what it feels like to rebuild an engine from the ground up and have it start straight away, not the cars engine yet, but in a pit bike :-) Its a single cylinder 150cc OHV 4 stroke.

My question is now, how would i know whether the spark timing and carb jets are correct? All i know at the mo is that it started second kick (after i remembered the kill switch) and seemed to tick over beautifully. I guess i must have got the valve timing all correct by this stage, but the spark pick up is adjustable, and so is the carb obviously so i just want to make sure i arent going to do any damage having to lean/rich or advanced/retarded. Thanks in advance