I received the Airsal kit 70-cc.
It does have the very tough coating on the cylinder walls for wear.
I put the rings on the piston
And yes I saw the ring end pins in the groove so the rings are in the right way.
The problem is when I oiled up the cylinder and inserted the piston the rings hang up on the sharp edge of the 2 bigger ports.
I figured no problem because I always bevel my ports and polish them up and remove any rough areas.
I finished up the job and still have the same problem.
This will take it's own set after a few minutes of running but it's not right. There is a problem and I am at a loss.
I just built up an engine for a bike and worked the ports and the piston slides up and down super smooth.
Any engine builders out there care to take a stab at this?