2009 Yamaha YZ250 2-Stroke Bike Test

Professionally, the YZ250 (12) has to compete against the likes of Yamaha's YZ450F (7) and the rest of the 450 monsters. Now, with rule changes by the AMA, amateurs can race the 2-stroke in the 250F class which is much more realistic. Our quartet’s throaty rumble and whir of cam chains was constantly interrupted by the zingy sound of an expansion chamber and shorty muffler. The AMA now allows