I'm posting this info request in both 250 and 450 forums to get the best cross section of info to go on. Thanks for any input. I am going to try and qualify for Lorettas this year in the older vet class. I currently ride an RM 250 2 stroke (which I have not yet re-adjusted to) and an 02 YZF 250. My regional is at Red Bud which is now a semi sand track, with elevation changes and it ruts up real bad. I am afraid my 250 YZF will be underpowered, both by the track itself and the fact that most vets ride big thumers, so I decided I have two option if I want to race the 4 stroke: Option #1 - Big bore the 250F. I have not yet gauged the expense or any reliabilty issues with this option, so I am in the dark about this option. Option #2 - Purchase a YZ450F and re-adjust my riding style to handle the power and the torque of the big thumper. If anyone here has been down this road, any insight would be greatly appreciated. My first area qualifying race is scheduled for the first of March, and it will be here before you know it. Let me add that I am slightly over 6 feet and I weigh about 180 lbs, without gear on. Again, thanks for any info.