So recently while I was riding my bike I was in 4th gear, steady speed and out of no where it started to bog down like I was getting stuck so I down shifted and it did fine for about a minute and started to bog down again. So again I down shifted and it did the same thing every time I down shifted until I was in first gear and the bike just shut off. it will turn over and crank for hours if I tried but no start at all! PLEASE HELP!!!

 

Is there any oil in it? If that is OK, you probably a blocked carb, but check if you have a spark first.