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

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Husqvarna 455 rancher . it has low compression and no fuel to plug . wont start but piston and rings are fine .Help

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It could be the small gasket between the head and carb. they are also bad about the fuel line coming out of the tank gettin rubbed and making a small hole or pinched.

Posted on Oct 12, 2010


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Trying to find the correct compression for a Husqvarna 455 Rancher chainsaw?

you wont... as per husky anything under 110 would be suspicious. I have seen those saws with the lower piston ring gummed up from a rich fuel mixture.

Nov 29, 2013 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

I have a Husqvarna 455 Rancher - about 1 month old. Worked perfect one day. Would not start the next. Feels like there is no compression. Second 455 with this problem.

There is only two reasons for low compression, either the piston ring has gummed in, or the piston has seized, remove the muffler and check out the condition of the piston skirt through the open exhaust port, any signs of scuffing and the piston has seized, it will then need to come apart to see how much damage has occured. Saws today are set up very lean on the mixture to get the best emmissions not the best running, they realy need to be using the very best two stroke oil.

Sep 09, 2011 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

50to 60 compression on a husqavarna 455 rancher chain saw. Ring job and how hard?

455 is an X Torq engine, this means it runs very cool on the inlet side of the piston, they are quite prone to gumming the ring in if they have been used on a heavy two stroke mix, due to the designit is a full machine strip down to get to the piston, skilled man 3 hours to strip and rebuild.

Sep 07, 2011 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

I have the 455 rancher and when I start the saw I pump the bulb 6-8 times and the saw will not run right. It sounds as though it is running out of gas. It bogs down when I pull the trigger. The saw is 2...

Before you do anything else i think you need to check the engine is mechanically sound, remove the muffler, take a look at the piston skirt through the open port, any signs of scuffing on the piston and it will require removing the cylinder to assess the damage, they are x torq engines, due to the way the air ports work they are quite prone to carboning in the piston rings, make sure it has plenty of compression.

Aug 21, 2011 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

Starts ok soon as u try to rev it bogs out die new carb no change checked muffler it ok fuel filter fuel line allok

Does it have plenty of compression, they are very prone to gummimg the piston ring in if you have been useing a large fuel oil mix.

Feb 11, 2011 | Husqvarna , No.455 Rancher, 20" Gas -...

2 Answers

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


Likely, the saw has been run with straight gas--no admixed oil. When this occurs, the piston, ring(s), and cylinder wall will have been deeply scored. Remove the muffler and turn the motor slowly while watching the surfaces of the piston, ring(s), and cylinder wall. If these surfaces are not smooth, then replacement of these parts is necessary. (very expensive with parts and labor) Hope this helps!

Oct 18, 2010 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

55 rancher Husqvarna got very hot due to no oil in gas, and will not start again.

The piston rings rely on the oil in the gas to lubricate the cylinder wall. More than likely, the rings are now too small to provide the proper seal for enough compression. It could also have worn the cylinder wall more than the rings, the end result is the same.

You can try to remove the plug, put in about a 1/2 teaspoon of oil into the plug opening, slowly pulll the rope 1 time to let the oil coat the ring & wall & then put the plug back in & try to start it. Use a little extra oil in your gas to provide thicker lubrication. good luck

Jan 31, 2010 | Husqvarna , No.455 Rancher, 20" Gas -...

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