try a new tank vent, the saw will run until a vacuum on the fuel is created. Then the line becomes vapor locked, forcing you to wait several hours before being able to restart.
just me
March 2010
Had exactly the same thing with one I acquired from a car boot sale
the tigers
March 2009
I can answer this question...
what causes my saw to cut out after running for a short time?
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Try fixfault.com to fix chainsaws.