Vforce 3 Reed Valve Sherco and Beta Trials (all years and engine sizes 80 to 290 2 stroke) Vforce 3 Reed Valve Sherco and Beta Trials (all years and engine sizes) The reed valve technology in the vforce 3 is the best and latest on the market,the vforce 3 will increase torque and responce as much as increase peak power,this is all very good news for all riders of all levels in trials compertition