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After starting and operating the chainsaw for a short time, it dies and I can't get it started again. Suggestions?

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Engines require 3 things. Spark, compression and fuel. And chainsaw need 2-cycle oil mixed with the gas.

Assuming you have the right oil-gas mixture and a fresh batch of gas, and you didn't leave old gas in the saw all summer long since last November.

-Take off the dirty air filter and see if saw starts without filter. Do not run without putting in new filter.
-Check exhaust port for mud dobber home or screen clogged with carbon and dirt
-See if saw fires up after squirting WD-40 directly into carburetor
-Check gas line >>> pull gas line loose and see if gas flows out of tank to carburetor
-Take out spark plug > put finger over spark hole and pull cord >> do you feel suction that says you got compression?
-Put spark wire back on spark plug >>> hold spark plug so threads touch bare metal part of spark plug hole >>> pull starter cord and see if spark shows between plug and saw >>> suggest you not hold metal part of spark plug while pulling cord [you'll understand why]
-If spark plug shows spark, then your saw has spark ... so put in new plug and start fresh.

If your saw has compression, spark, and fuel it should start unless carburetor is gummed up because gas was left in tank.
Here is the final trick. Start the saw while spraying WD-40 directly into carburetor and see if you can keep it going with the WD-40. This might take a helper. If this does not work, then carburetor is bad or gas line is clogged at carburetor. Time to take it to the shop.

Posted on Oct 07, 2010


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Posted on Jan 02, 2017


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My chainsaw was erratic. Sometimes it started and ran just fine and at other times it just refused to start or died as I raised it to cut a limb. What I finally realized is that chainsaws are different than other 2 cycles engine devices - they have to work at many different angles (including straight up). For that reason, the fuel filter that is in the gas tank is weighted to keep it at the bottom of the gas tank as you raise and/or lower the chainsaw.
On my Mccullough, the gas line broke right at the weighted filter, allowing the gas line to flop around. That's why it was erratic and died when I raised it to cut a limb. So, if you have erratic operation, take a minute to check your gas filter and be sure it's still attached to the gas line......

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