Hey guys, LONG TIME lurker, first time poster. So some background about my bike; it's a 2000 xr250. I purchased it used in 01 when I was 13, it had 11 miles on the clock and I gave $2200 for it. It was my first "big bike". I have always maintained it religiously and it still wears factory plastics. I always kept count of my tripmeter, and the bike had 7562 miles on it when the thing mysteriously quit working 3 years ago (probably close to 8500 now). Only repairs I've made were rebuilt forks, and new shock about 3 years ago. I'm 5'11", 235 and I've never felt underpowered until last week. I hit a healthy hill that ive climed 100's of times, in 2nd like always, and it bogged down and stalled out on me. (I waited too long to down shift, although I never had to before) now I've gained about 40lbs since I was 13, but still never felt underpowered. Before I ask, I have NO INTEREST WHATSOEVER IN A CRF. I have dozens of hours on 450r, 250r, and 250x's, and don't care for them. Now, I'm wondering should I throw a 280 kit in my 250, or start looking for an xr400r? I've ridden a 400 some, but it was years ago. What's the power difference between a xr280 and an xr400r? Do you lose alot of torque with a big bore? My riding style evolves alot of tractoring, lugging ect. I ride with a 13 crf450r, 08 yzf450, 04 wr250, and an unknown year (85-86) kx125. I have no trouble keeping up to speed where we ride (there's only so fast you can go) but they do smoke me on a fire road, field, ect. I'm not worried about drag racing, just being able to haul my fat ass around lol. Also, there is NOTHING wrong with engine now. Sorry for the long post, but any input would be appreciated.