I took my carbs and all off. Cleaned everything changed oil and coolant put it all back. Cranked bike. it smoked white smoke for a few seconds but went away after like 15secs not heavy smoke either, well I shut it off and cranked it again bout 20min later let it idle and all. I reved it a couple time . It sounded good not perfect but its was decent. Well I shut it off again. Bout 45mins go by and I go to crank it again. This time no crank. the fule pump works. Relay works fuses good I checked plugs number's 2,3,and 4 plugs were not fouled or blackened they had a grayish tent on tips. An seemed fine. The number 1 was black and smelled like gas. It was fouled
my question it why did it foul and what would make it not crank again after it did just fine 45mins before. Please any advice info anything. thanks

 

sounds like its flooding in cylinder #1. causing it to hydro lock and not crank. try bumping the ignition switch with the plug out and the coil wire out of the way and see if fuel is coming out of the cyl, if so then you need to check you carb on that cyl.