Question about Husqvarna Chain Saw 20" Bar

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Starts for a few seconds, then quits

I have completely disassembled the saw, cleaned everything and reassembled and am experiencing the same issue. I am thinking nw that is could be a bad ignition coil. I gapped the coil from the magneto at .008'' (also tried .005 and .010 and got same results).

The exact symptom is that I can choke it, it starts for a second, then quits, which is normal. I then unchoke it, and is start high idle for 2-3 seconds then shuts off, which is not normal, it usually stays running after the second pull on unchoke position.

I have tested the coil and it is showing 6.77 kilo-ohms from base to cap.

Any thoughts?

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  • joh9356 Apr 19, 2009

    Sorry, I meant to mention that it the model is a 55 Rancher.

  • joh9356 Apr 19, 2009

    Update:



    I have since obtained a service manual and found the gap specs for the ignition, and they are as follows for this saw:



    Air Gap: .012 inches

    Plug gap: .020 inches



    Have tried both of these but still no luck.

  • joh9356 Apr 19, 2009

    All of the above recommendations have been tried and checked.



    Like I said, I completely disassembled the entire saw and cleaned it meticulously. I have replaced all maintenanceable items.



    The only thing I have not checked as of yet is the fuel line length between the tank and the carb. I know I have moved it some. It is supposed to be 115mm or 4.5 inches, and apparently is very critical. I will check this tomorrow and see.

  • joh9356 Apr 19, 2009

    By the way, the saw is only 5 years old and have been used very little.

  • joh9356 Apr 19, 2009

    I inspected the fuel line meticulously and found no cracks or wear or anything. I replaced the fuel filter also already. I performed the above measurements according to Husqvarna specs.



    By the way, the 55 rancher has no primer bulb. The only fuel line it has is starting at the tank: it goes fro mthe in-tank fuel filter, out through tank, through the body of the saw, into the carburetor. There is no other fuel line on this saw.



    It is still having the same problem.

  • joh9356 Apr 19, 2009

    OK,



    I figured out the problem myself.



    I had to disassemble the vibration system to separate the main body from the fuel assembly. In the upper part of the fuel tank assembly there is a fuel vent pressed into the tank. This vent was clogged. I had to remove the vent, clean it out, and reinsert it.



    After I reassembled it, it cranked the first pull, and stayed running just fine.

  • Anonymous Apr 19, 2009

    same thing, a rancher 55, about 5 yrs old, starts then quits, if I get it started and give it gas, it chugs and then quits, cleaned air and fuel filters, new spark plug, no solution

  • Anonymous Apr 29, 2009

    My rancher 55 would only start after choking and then would shut off before I could get a hand on the throttle. (Starting the saw for a standing position with saw between my legs). I had been through the same check list, fuel line, fuel filter, spark plug, air filter. After reading that the solution was the fuel vent, I turned my saw on the side to see if gas would run out the vent suggesting it wasn't a clogged fuel vent. Gas did run out, so I concluded it was not the fuel vent. Just to be safe, I removed the fuel vent anyway, cleaned and reinstalled. The saw started up like new and ran like always! I can't explain why gas would run out, but air wouldn't go in??? Thanks for the help everyone!

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SOURCE: Starts for a few seconds, then quits

You will have to remove the air breather and carburetor to make the job easier. You will then be able to access the fuel lines easier. You may also need to take the gas tank off. While you have the carburetor off, it might be a good idea to clean it as well. Use a Den Tek Brush, (used for cleaning teeth), for small ports in carb. And depending on how old your chainsaw is and how much it is used, you may want to go ahead and get a carburetor kit and replace the needle valve, small screen, and appropriate gaskets. Sounds like it might just be your fuel lines though.

Jim

Posted on May 29, 2009

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