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

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My 455 rancher won't maintain power. I have

My 455 rancher won't maintain power. I have changed the spark plug, adjusted the gap and added clean fuel. Any suggestions?

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If you have been running ethnol mix in your saw there is a good chance that your fuel vent line is plugged. Loosen your fuel cap and start saw on its side and see if it runs. If it does you will have to clean your fuel vent.

Posted on Aug 03, 2009

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If its over a year old and you used other than 93 octane, you need to rebuild the c arb, i did an runs like new

Posted on Jul 31, 2009

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2 Answers

My Rancher doesn't maintain high rpm. What's wrong?


Most 2-cycle chain saws have 3 carburetor adjustments; idle speed, low RPM fuel/air mix and high RPM fuel/air mix. The fuel/air mix needle valves will probably require a "special" driver tool to adjust them. Be careful with the adjustments, you can really mess things up by incorrectly adjusting them, then your saw goes from running poorly to not at all.

Apr 04, 2015 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

How to test ignition module


There are plenty of spark testers on the market, if you want a quick check remove the spark plug, use a new plug with twice the plug gap 0.6mm earth against the cylinder ( away from the opem plug hole ) crank the engine at normal starting speed, if there is a spark the unit is probably fine.

Nov 13, 2012 | Husqvarna , No.455 Rancher, 20" Gas -...

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Husqvarna 455 rancher Starts fine and runs great for about 5 mins. Stalls and wont restart until cold. Problem than repeats


Try removing the fuel cap for a moment to see it can be restarted immediately. If this works, check the fuel tank vent for plugging problems. Also, check for spark at the plug when it dies--if no spark, try a fresh plug gapped at 0.020". If nothing, the ignition module may be failing with heat. Good luck!

Jan 17, 2011 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

455 wont run


Make sure the muffler has not become plugged. Check the flywheel key as it may have sheared off for some reason causing the timing to be off, yet still generate sparks. Are the sparks blue and snappy? If not, check the ignition module gap to the flywheel magnets--use a thin business card for a gauge. A wide gap can cause weak spark. Hope this gets you running again!

Apr 30, 2010 | Husqvarna , No.455 Rancher, 20" Gas -...

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Magneto to flywheel gap for Husqvarna 455 Chain Saw


Ignition module gap
Place a business or index card between the fly wheel and coil, rotate until the magnetic attraction pulls everything tight together. Tighten the coil screws, rotate the flywheel until the attraction eases and remove the card. Ensure nothing contacts when flywheel is rotated.


If you have more questions or need additional help please reply below and I will get back to you. Thank you for using FixYa and Good Luck. HTH
Lou

Mar 22, 2010 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

Hard to start, new racher455


1) Check plug & gap if that doesn't work try new plug. 2) Try cleaning air filter 3) Clean out main jet 4) Test petrol filter inside tank if dirty fit new one 5) Take plug out & fit inside HT lead & put to head of engine & see if you can see a spark when you pull the cord

Jan 24, 2010 | Husqvarna , No.455 Rancher, 20" Gas -...

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Husqvarana Rancher 55 , how to clean the exhaust port


Cleaning the exhaust: on the saws I've worked with it was just to loosen two bolts at the front and then the exhaust is off the saw. Clean with brake cleaning fluid and blow with compressed air, let it dry before assembling. Don't forget to clean the fine mesh at the output side underneath the lid if present (i.e the spark arrestor).

Make sure to have your carb adjusted properly afterwards.

May 18, 2009 | Husqvarna , No.455 Rancher, 20" Gas -...

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