I then decided to buy a Pro-X racer 65.96mm +.02mm Oversize "C" Pro-X Piston Kit and put that in, I haven't started the bike but my compression is still barely breaking 60 PSI. When I put in the Pro-x piston, I can put a 25 mm shim in between the cylinder wall and the piston, which I assume is normal. I checked and rechecked the piston rings to make sure they were aligned and still nothing. Also replaced gaskets, sleeve and new surclips. Also tightned all bolts to spec. You are probably wondering why I haven't checked the old piston the bike came with, welp naturally, I can't find it after I moved recently. So both standard bore wiseco 66 pistons do not give me enough compression.
Here's just a top end.
![Image](https://i.ibb.co/yqRqCnK/cylinder-shim.jpg)
I can put a 25 mm shim in between the cylinder wall and the piston. I am assuming this is normal?
![Image](https://i.ibb.co/vdhVMs5/cylinder-two.jpg)
Measured the cylinder and it appears to be 66 mm. It appears to be stock?
![Image](https://i.ibb.co/Vj1s9Rt/cylinder-measure.jpg)
I can't account for why I am not getting enough compression! Any ideas?