I am looking for a used dirt bike, but i don't know what i want. Price range around $2,500-$3,000 (used). I am between a 250 2 stroke and a 450 4 stroke. I am a big guy, 6' 4'' around 260lbs. Mostly riding with friends at my family's farm and maybe to the track just for fun (not racing). Will the 450f be better for my size and weight than the 250 2t? Are 2 strokes more fun to ride than 4 strokes? Maintenance? Power difference? Speed and acceleration? Pro's and Con's of both? BTW, I have about 6 years of experience on dirt bikes xr100r and 4 wheelers. I think some companies are discontinuing their 2 strokes, will this make it hard to get parts?