I purchased a YZ450F le a few months ago, and it was rejetted and now has 13/51 gearing for hare scrambles. It has been running great up until two days ago. It has always run awesome no matter what i have done. Now when i jump It stalls in the air, no matter the gear or if the clutch is engaged or not. I normally dont have the gas on when i jump and it has never happened on any other yz i've had. But I'm worried because i have a hare scramble this weekend and im wondering if there is dirt in the carb or what the scenario is. Any help would be appreciated.