Question about Husqvarna , No.455 Rancher, 20" Gas - Powered Chainsaw

1 Answer

Will not start. Spark ok tried with started fluid

Will not start. Spark ok. Tried with started fluid still no luck .

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  • drallim Jul 10, 2010

    Did the engine pop several times? If yes, then the fuel system needs looked at. Check the fuel filter, air filter, and muffler for plugging. Check the fuel lines for decay, splitting, or other damage. Does the primer bulb pull fuel into itself after several pumps. If still no help, remove the carburetor and check the condition of the diaphragm in the lower chamber--it should not be hard or cracked. Also, check the intake system behind the carburetor for any damage or decay. While the carburetor is off, take it apart, clean with spray carburetor cleaner, especially the small filter screen set down into the transfer port. Go to:http://www.drystacked.com for a 12 page article on Walbro brand carburetor theory and troubleshooting. The information applies in general to other brands of carburetor. Hope some of this helps!

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Spark should be blue and snappy with fresh plug gapped at 0.020. Try putting some fresh fuel mix into the plug hole and try to start--it should pop several times. Does the engine seem to have good compression? If not, remove the muffler and check the piston skirt and cylinder wall for severe scoring. If it is, then the engine has probably be run on straight gasoline or poorly pre-mixed fuel/oil. At the very lean fuel/oil ratios ( 50:1) recommended for today's saws, proper premixing of fresh fuel and a modern synthetic oil made for saw use is imperative plus the fuel container should be vigorously shaken just before each filling. If the compression appears good, then check the fuel filter, air cleaner, and muffler for plugging. Check the fuel lines for any decay or other damage. Make sure the carburetor fasteners are tight. Hope some of this helps!

Posted on Jul 14, 2010

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