Hey Vince.Have you had any personnel experience with a bike that has part # Z90543 installed?The info I just read about the part indicates that shifting could be a little harder{stiffer or more resistance at the shifter?} The sales info. also indicated that this kit is for 4SPD left hand shift models,Im assuming that they are refering a bike that has a left hand shift mechanism and that there not refering the clutch lever being on the left side.As my bike has the shift lever on the right side it sounds like this kit is out for me.If anyone can verify that, there input would be most appreciated for if this is a good kit that will fit on a right side shift bike and is a good product that will really improve the shifting characteristic, I would like to know this.Any thoughts anyone?cangrejopup