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Yamaha has (had) a 2wd 450cc machine they raced in the DAKAR. I believe it used a hydraulic pump on the rear driveline & a hydraulic motor on the front wheel. I also believe it could be disengaged via a solenoid. Helps out a lot in deep sand, not a lot of mud in the race. The drier & more hardpacked the surface, steering gets a little dicey.
Don
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