81 kz305 pistons

deegster19 wrote:

Hey everyone, this is my first post here. I recently got a 1981 kz305 that had been sitting for 20+ years in a shed. Long story short it ran and drove with simple maintenance, but severely lacked power. I eventually figured out it needed the valves to be redone bcuz of rust and carbon buildup on the seats, and i figured i might as well do the rings while I'm at it, and I had found a relatively cheap ring kit for it. When I went to take it apart, part of the piston in between the two compression rings just fell apart. The piston and cylinder walls also had scoring, and it is going to need new pistons. After a few hours of scouring I have come up with the conclusion that pistons for this bike are almost impossible to find. Does anyone have any ideas as to where I could get some at a reasonable price? What are my options here? Any help is greatly appreciated!

 [attachment=176853]301c3395f87105da6bf0e50a7cae11a6[/attachment][attachment=176853 wrote: Screenshot 2025-04-20 11.37.38 AM.png[/attachment]Scirocco post=911523 userid=48181"]GPZ305 pistions 1,00 mm oversize. Cyl. bore/hone size 62,00 mm.

www.scheuerlein-motorentechnik.de/motorr...n-kit-uebermass-1-00