Per the fine folks at Socal Supermoto, this YZ450F has lap records at both Adams and Apex while being piloted by its owner, American racer Joe Roberts.
The motor is stock but the rest of the bike is highly modified – Ohlins TTX shock (suspension set up by Fast Bike Industries), Hinson slipper clutch (has not been ridden since it was rebuilt by Hinson), Brembo master cylinders (front paired with Beringer 6-piston caliper, rear on handlebar with IMA rear master cylinder in traditional location to allow rear brake manipulation with both your left hand and your right foot.
Find this YZ Sumo for sale in Southern California (I know that’s vague) for $6,500 here on Facebook.