How 2-Trac works
Unlike the drive systems we are used to on motorcycles, 2-Trac features a hydraulic drive to the front wheel. As Lars Janson explains in his interview (see archive) the Yamaha patented system uses a hydraulic pump located on top of the gearbox and driven by a chain in oil bath (see red circle) which actuates hydraulic fluid via high pressure hoses to the front wheel. The special hub in the front wheel is a "hydraulic motor" (see blue circle), which is set in motion through the pressure of the hydraulics.
This construction allows a "smart operation": the pressure and consequently the pulling power on the front wheel varies the more the rear wheel slips. The system can regulate itself and applies always the best ratio of power between front and rear. You can also adjust the system, depending on usage of the machine and apply more basic thrust in front or less.
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