These flywheel weights will fit any GG Pro 125/200cc model from "02 onwards. They change the power delivery making the bike smoother and more controlable 'off the bottom'. They will help the bike grip better and help stalling...work VERY well on the 200s....shrink fit, needing to be heated to fit onto flywheel.Two/three 'tacks' of weld are adviseable when in position. Make sure the spark plug cap is pulled off before welding so not to damage the ignition.