Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

Wondering what is a good compression  for a saw mine seems to be around 50 -55 pounds?

Depends on the saw, check either the maintenance manual or a local OPE shop.

Diffferent saws are designed for different compression ratios.

The Husqvarna website (  http://www.usa.husqvarna.com   ) doesn't list a 254XP so check that you have the correct model number.

buddys wrote:

That is not near enough. Should be at least 80psi to run decent.  Normally they are around 100psi to as high as 140psi. Take the muffler off and see if the piston is scored.

My 254XP lacked compression and the piston wasn't scored.

It turned out that one of the bearings (pin bearing) came out of where the connecting rod is attached to the crank and came up through the cylinder. It didn't damage the piston or cylider sides. (just the top) It gave enough play in the rod to oval the cylinder and lose compression. In the end the saw wouldn't start.