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possible water or dirt in the carby and main jet
could be a leak in the fuel pick up ;line from the tank or blocking of the fuel filter at the line end in the tank
go google and type in ---workshop manual for stihl 051 chainsaw and they have a good pdf version to down load
the seal is missing youve dropped it in a garden somewhere
you need a new one
try ebay
but i will tell you stihl is VERY good at service parts
and very helpfull
Ive had numerous similar faults with both stihl and husqvarna saws. all turned out to be leaking fuel tank vents. Im not sure if this model has a vented tank or not but it might be worth checking. Sounds like a fuel/air issue.
This saw has a fuel tank vent that could be leaking a small amount of fuel, or the fuel line coming out of the tank could be leaking. Fuel line replacement isn't complicated, you could try installing a new one. If it's the vent, odds are it's not enough to cause alarm........unless the vent line is cracked. In that event, you should replace the vent hose. Again, not a complicated repair.
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