To make a longer story short, the dealership who setup the sled removed the carbs to change main jets and e-clip position, never placed the carbs into the air intake mainifold properly, when I was putting the boot on the left side (sitting) air box and the carbs popped off.
It takes some time to get them in the air intake manifolds and make them secure - YOU MUST PUSH THEM INTO THE AIR INTAKE MANIFOLD UNTIL THEY WONT GO ANY FARTHER, WHILE HOLDING THEM IN TIGHTEN THE SCREWS ON THE CLAMPS.
note! that if not in all the way they will popp out - my 900 M/C like all other sleds I have work on have a ridge in the mainfold to hold the carbs, I don't know if these do or is the air intake manifold to short ?
It is a problem that could cause engine damage.