Lack of money and spinal injury, buddy..I have rode at whaddon before quite a few years back, and loved it, i remember everybody saying the farmer dont let people on for pratice out side of race days. But after a disscusion with him and a quick £20 i was trapping about for 11am till 4pm. Still love my dirt bikes always will.
that would be the worst..i bet you would have to immediately rebuild your bike after this because its probably not too good on you pistons and cylinders.