Chainsaw Repair

Compression psi only tells you that an engine will run, not how well.  It also takes a little longer than 15-20 minutes of run time for your new rings to seat onto the cylinder wall.  Run it through a couple more heat cycles and then test it again.  Keep the carb rich for the first few tanks of fuel and try a different gauge.  If the cylinder has alot of time on it, it may also need to be replaced.  To give you an idea how long it may take for those rings to seat, some engines take 6-10 tanks of fuel before everything seats.