Questions for the repair experts

[Rapidrob]

On 2.5 and 3 HP B&S engines,flat heads, old types, what is a normal compression psi reading?
Once the exhaust valve seat has been "dimpled" with a center punch ( a ring of dimples to form a circle around the seat forcing AL to flow towards the valve seat) has been done once, and the valve is now leaking again, can the seat be re-cut again or is the short block toast?
Is it worth it or just sell the engine for scrap?

 

[MB165]

If the seat has been staked and has come loose again, id say junk it.
Ive seen them run on 60psi compression, thats on the low end. 75-90 is avg.

 

[Rapidrob]

Thank you for the info.

 

[oldfatguy]

is the seat loose or is the valve leaking ? also did you check the gap on the valve lifters ? I had one that had low compression because the valve wasn't closing all the way because someone put in a new valve but never filed it to set the lifter gap.

 

[Rapidrob]

I took the engine completely apart. The exhaust valve seat has wear. I might be able to re-seat the valve but I'm concerned it may sit too deep in the seat. The engine ran but only had 70 PSI. It had a lot of blow-by when warm at higher RPM.