Trail Tech Flywheels are manufactured from hardened chromoly steel then carefully machined and balanced by skilled craftsmen. A balancedflywheel will reduce engine vibration. Trail Tech carefully balanceseach flywheel during manufacturing. Installation takes only about 30minutes and is very simple - no drilling tapping or grinding isrequired (on most models). Use an air ratchet and the correct flywheelpuller for easy flywheel installation.Adding weight: Increases inertia/torque Smooth’s powerdelivery allows the rider to rider longer with less fatigue Reducesbike stalling at low RPM Top speed not affected.Removing weight: Increases acceleration/snap Better throttleresponse! Increases engine responsiveness for sand.Please Note:All electrical components must be fitted by a qualifiedtechnician.Before fitting electrical components ensure the root cause of theoriginal failure has been addressed.The absence of either of points 1 or 2 above will void anywarranty. Fits: Kawasaki KX250F 2004