Zzzzzzzzzzzzzzzzzzzzzzzzzz.... huh? what?
Sorry for the late reply...
Anyway, Jeeper (Brian) was correct about my main motivation to get the 280 kit. That is, I bought a nice 2006 CR125 last summer as I wanted a light 2T as a second bike. After riding it, I realized it just didn't have enough power. My buddy that has a shop wanted it bad, so we worked out a deal where I got a bunch of work done including the 280 kit and head porting in exchange for the Honda.
Now, my plan was to eventually do the 280 kit anyway, but only after I had enough miles to justify freshening up the motor. At only 67 hours, i wouldn't have normally done this, but it was to good of deal to pass up based on what I paid for the Honda. I would say that the 280 kit made a good bike into a great bike though. The gains it got were all in the bottom to mid range. It definitely brings it 'closer' to the feel of a 450.
OK, so the 450 4T vs. 250 4T thing... I can't say there has been a time that I have regretted the switch to the 250. Keep in mind that I only weight 155 to 160 wearing all my gear, so that could be a factor. The KTM makes more power than the other 250s in its class, so I'd think that helps too. I did have to learn how to ride (and shift) at a higher RPM if I wanted to utilize the most power from this bike.
I had the opportunity to race both bikes doing the same BOR race. The 450 in 2010 and the 250 in 2011. From one year to another, nothing had really changed with me. My fitness level was basically the same (lacking
) and had plenty of familiarity with both bikes. Teh biggest difference was that the 2010 race was 120 miles and the 2011 race was 240. I felt no more tired after the 240 miles as I did after the 120. That extra 20 to 25 pounds made a huge difference. Like I sid before, I'm not a big guy, but that would have an eventual affect on anyone.
On a somewaht related note, I love 2 strokes and will get another one as a second bike. However, I've finally found what I feel is the perfect bike for me. For maintenance and repair cost reasons, I wish it wasn't a 4T, but it is and I'm stuck liking it too much.
Caleb, anytime you want to try it out, just let me know...