Am going to strip the 89 engine and whilst apart replace the piston, any recommendations 're piston or supplier appreciated, will be standard bike with no tuning only power valve fitted.
PJME. Any piston from them should be reliable.
Always Originate, Never Pirate!
Vertex or Mitaka are great.
Keep it real
I've heard of a small company called Yamaha who might have one in stock
Sarcasm aside any decent brand will be ok