Have a 2000 kawasaki ninja zx6 bike spudders .. so I took off airbox and filter and it runs fine . Then I just took off filter and put airbox and then it sputters again . Any suggestions ? Thanx

Its a breathing problem check breather pipes etc,or try some k+n filters!!! simon

G'day,
I have a suggestion.
It worked with no airbox( airbox lid I guess you mean).
Then I would think that your problem would almost certainly be a blockage or restriction to the air flow entering the airbox intake.
Look in the airbox,with the lid off-And see where the air enters the box- the air ducts on each side.
Make sure these are clear of any obstruction.
Check the air intake vent in the front of the fearing for obstructions.
I feel pritty sure you'll find your problem here(I hope!).
See how you go
Kind regards Andrew Porrelli