Hi guys. I just cleaned my carbs. On the output side (towards the engine) on the inside of the barrel was a white, dried chalk looking substance. only from the slides towards the engine. anyone have a clue what it might be and if it is a problem. I do not know. I hope its mag chloride or salt from the road, or ethanol residue. I did a plug test the day before and they all looked good. cardboard colored electrode, dark and oily 3 threads down. full and half throttle. I don't know if I should be worried. thanks