2000 XP 947 engine noise / vibration

[banker505]

Hi , my 2000 XP 947 engine has a noise and vibrates when you increase the rpms. It starts and idles ok. I checked the motor mounts and drive shaft, I also replace wear ring and carbon seal. I checked both rave valve and reed valves.
Compression
130psi mag
120psi pto
I pulled the cylinder head cover and I'm able to rock the pistons a little. don't know if this is normal.
This video is from the pto side.
thanks for any help

 

[mikidymac]

10 psi difference between cylinders isn't a good sign.
Typically when a 951 vibrates really bad it is a crank or balancer bearing on the way out.

 

[banker505]

Update. Pto piston was bad and the counter balance timing marks were way off. I guess the previous owner didn't do a good job. In the process of rebuilding now