My craftsman saw idles fine but at half throttle it dies. i have replace the fuel lines and still the same results change spark plug and refueled with fresh fuel

SOURCE: Primer bulb won't hold prime

Check the fuel filter, air filter, and muffler for plugging. Check the fuel lines for decay or other damage. Remove the carburetor and check the impulse passage that runs from the crankcase, through the gaskets and heat insulator, to the carburetor base--these impulses cause the carburetor to pump fresh fuel into itself. You may need to clean the carburetor inside and out with spray carburetor cleaner. Check the diaphragm in the lower chamber for softness and no damage. Go to: http://www.drystacked.com for a 12 page article on Walbro brand carburetors for theory and troubleshooting--this applies to other brand carburetors as well. Hope some of this helps!

SOURCE: Craftsman hand held gas leaf

If it has a spark then try spraying some starter fluid on the air filter. If it attempts to run then the carburator is stopped up. If it doesn't then you most likely have low compression. Remove the spark plug and screw in a compression tester and pull the starter a few times. It has to have no less than 70 psi to fire and run. 90+ would be even better. If it is 50 and below try pouring a little oil in the spark plug hole and repeat the test. If it improves a little then you have a scored cylinder or piston or stuck or broken piston rings. Let me know what you learn and I'd be glad to walk you through some more.

SOURCE: I got a craftman 32cc

Did you check the fuel filter in the tank for plugging and the condition of the length of fuel line that connects it to the carburetor inlet? Hope this helps!

SOURCE: I can not start my Craftsman's chain saw. It was

If all is as you say you now need to check that it is mechanically sound, remove the muffler and check the condition of the piston through the exhaust port, any signs of scuffing or damage to the piston and the machine will have to come apart to assess the damage.
Good luck.

SOURCE: I have a Craftsman 2.5

Seeing a lot of fuel line problems due to ethanol. Make sure your fuel lines and primer lines are in tact. If the fuel line has broken, you may also need to clean out the inlet screen in the carburetor which can also become clogged.