I am considering a YZF 250 or a YZF 450 as my next bike as a replacement for my WR450. I am a big guy (6'3'' and 200 pounds, in good physical shape) and raced "open bikes" all my life (CR500, YZF465, ...). I am back riding after 15 years and find my WR450 too heavy (otherwise it's a great bike). I trail ride a lot, do a bit of MX for fun (no races) and race Hare Scrambles (+ 40 class). The fast guys here in HS ride smaller 2 strokes (YZF/RM/KX 250 or KTM 200). I am considering getting a YZF 450 with a 9 oz heavier flywheel or a YZF 250 (probably with a heavier flywheel but lighter than 9 oz). Here are my questions: 1) Is the YZF 250 too weak for a big guy like me? Will I really miss the big 450 power? (The YZF 250 has the same power/weight ratio as my WR450...) 2) Because I am relatively heavy and stil pretty fast, will the YZF 250 be more maintenance (both time and $$$) Thanks for the feedback, I don't want to make the wrong choice.