State of piston/cylinder

[kz1000st]

Originally Posted by padly1995

Hello,
My gy6 75cc scooter loosed about half of its power, and its max speed si around 70kmh.
Its also starting harder when its cold outside. After trying to change everthing besides the cylinder and piston i tooked those two off.
Do you thing they are bad?
Attachment 765
Attachment 766
Attachment 767
Attachment 768

And also exhaust valve is orange, do you know what could this be?

thank you for anwsers.

The valves need adjusting. A small GY6 has its valves gapped at .002 inch and the valves stretch a little requiring an adjustment at the rocker arms. Check the gaps when you reassemble it and you will see.