Got a back-fire threw #1 carb

[Piute]

 while messing with install (carb)N leaks ,plan to check valve clearance and points 1st thing ,
  but would like / appreciate any others info,ran out of spray to cheak for leaks around mounting boots
( but was just A bit on #1 and #3 bit more just tightened ,
                                     Bike was pretty hot So called it a night.