Yes, the cr250 will stall easier, and it will also be more responsive and rev out faster. With you racing XC, I would highly recommend getting a flywheel weight. There is a lot of opportunities to stall the motor in the woods. The flywheel weight will help with that. Go for the largest one you can find, which is typically 140z. You will still have great responsiveness. Even with the largest weight, the cr 250 flywheel is still lighter than the factory 250R flywheel.