Open high speed screw just a little?

[burtshaver2021]

On my 95XP the compression on the PTO cylinder is a little lower than the mag cylinder. Nothing crazy, all is well, I can’t remember exactly what the numbers were, something like 135 mag and 130 PTO. Can I crack the high speed screw on the PTO cylinder open just a 1/8 turn ? Will this stop the PTO cylinder from wearing faster? Does the PTO cylinder wear a little more on all these engines? Can I run the high speed screw 1/8 turn further open then factory settings on all my machines

 

[etemplet]

Not sure about this particular ski but a few carb skis recommend a PTO high speed adjuster setting greater than "lightly closed." With 130psi and a good compression gauge I'd expect to see some obvious damage to the piston on cylinder walls. You're down 20psi from new compression numbers. I'm an old 2-stroke guy so I think nothing of doing a top end. LOL

 

[burtshaver2021]

What do you mean by seeing obvious damage to piston and cylinder walls? My thinking has been 125 pounds is time to start thinking about rebuild. This would be just from regular wear, I would not expect to see any damage.