I just bought a 07 Ninja 250 with 1600 miles, the carbs were clogged and the seller took it apart and cleared the clogs, but I have this interesting problem, whenever I rev up the engine it will stall when the speed comes back down, it also happens when I press in the clutch after going at speeds over 30 or so, the only way to stop it from stalling is by lightly giving a bit gas right after I press the clutch, I've noticed that it happens more often if I first let the gas go and letting the engine brake for a few seconds and then when I press the clutch it will instantly stall.

I was told that it might be some remaining clog in the carbs, so I ran a few tanks with Lucos, but I still have the problem (it might of improved a bit but still happening) I tried increasing the idle speed and it helps a bit, but it still happens, and it just revs the engine at 3k for no reason.

please help

i have the same prob on my friends bike and i was just about to post until i seen this. stumbling on acceleration to right?