Question about Husqvarna 455 Rancher 555cc 35 hp 20" Chain Saw

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55 rancher-put new after market piston,ring and cylinder new sparkplug,cleaned carb,tried adjusting hi lo-new gas filter,new fuel line ,cleaned air filter-will start but on acelleration bogs and dies took to chain saw teck and they tried everything even replaced the carb with one from a working saw they said maybe the after market part is different but i got a complete piston,ring and cylinder so why would that make a difference at wits end

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I had a very similar problem with a stihl 029 farm boss.I did everything you did except I took it to a shop to do the piston and ring replacement. When I got it back the first time it would run for about two mins. then die.I fought it for a couple of weeks then took it back and expressed my displeasure. Then checked it all over and replaced piston and ring again and it runs great. They told me they could not get the right compression with the first one and thought the groove for the ring was cut to deep.I hope this is of some help to you. Thank you.

Posted on Mar 21, 2011


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Husqvarna 55 rancher-just put new piston ring and cylinder.saw start right up and idles.when i try to acellerate it bogs and try to stall.when I let off gas it idles fine again.I tried turning mixture...

The plastic carb mount has a hole and a slot, this is the pulse channel from the cylinder to work the pump diaphram in the carb, if you look behind the plastic plate there is a tube that fits into the cylinder under the black induction rubber, this feeds a positive and negative pressure to the carb as the piston rises and falls, make sure you have re fitted the small seal in the cylinder that seals this tube or you will have big running problems.
Let me know if you need more help.

Mar 02, 2011 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

I have an Olympyk 970 chain saw. It is diffucult to start, then only runs a few seconds, will not speed up. I have changed the spark plug, new gas line, new piston and rings. new carburetor kit. Thanks

Hi sewallgood,
I will try to give you a few suggestions to help solve this problem. I see you have replaced the piston and rings. Did you hone the cylinder wall before installing the new piston and rings so the new rings can properly seal ? Have you checked the compression after installing the new piston and rings? Did you have instructions on how to properly clean and install a new carb kit, as it is very important to get it right on? Have you cleaned or replaced the air filter? When working on the carb, did you replace the very fine mesh filter that is located inside the carb? What can cause the engine to run just a few seconds, can be the fuel tank not venting. As fuel is being removed from the tank, air has to replace the volume of fuel removed. This is usually done by the fuel tank cap that has a 1 way valve that lets air in without fuel leaking out. Some others have the valve installed on the fuel tank itself. Check the valve for obstructions or if damaged. Being careful try running the saw with the cap loose and see what happens. There could be an air leak somewhere, affecting fuel mixture, (gaskets, loose bolts, etc.). Something that not too many people check is carbon build up at the exhaust port that will restrict exhaust gasses causing too much back pressure. This can stop high RPM from the saw. Remove the muffler and clean the carbon from the port. Set the piston at top dead center so carbon does not go into the crankcase and use either wood or plastic tool so piston and cylinder wall are not damaged.
To adjust the carburetor turn both mixture needles in (clockwise) until lightly seated so no damage is done to seat or needle. Now turn the 2 needles out (counterclockwise) about 1 1/8 turns. While engine running and warmed up, adjust until running good. Do not adjust high speed mixture needle too lean turned in (clockwise) too much, as this could cause not enough lube or cooling and damage the engine. Do not adjust lower than 1 turn from a lightly seated position.
Adjust the spark plug to .030". I hope I have given you a few good suggestions and that it is understandable. Any questions welcome. All the best and good luck.

Feb 19, 2011 | Garden

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 -...

1 Answer

My weedeater leaf blower never gets up to its' old speed. Runs about 1/2 the power. Tried a new spark plug and air filter. New gas didn't help.

Basics to check:
1) Spark plug - brown or dark brown - OK
- aluminum or silver - piston/cylinder scored
a) is it carbon or fuel fouled
b) is there spark

2) Compression - 125 to 150 psi

3) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated

Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
*if all of the above are OK and/or do not improve performance then:
Remove Carburetor
5) replace gaskets/diaphragms
b) use a spray carb cleaner to clean jets, holes, and body of carb

I’m happy to assist further over the phone at

Nov 11, 2009 | Poulan/Weed Eater #Wt200 711724 24cc Gas...

2 Answers

Flooding walbro carb from blower.

The problem centers around the carburetor. The question lies in the condition and operation of the carb initially.
It appears you may need to double check your assembly of diaphragms and gaskets. check for loose welch plugs, adjustment needles in the wrong holes, inlet needle set too high.

*note: metering side diaphragm goes on top of the gasket, fuel pump diahragm has the gasket on top of it.

I’m happy to assist further over the phone at

Nov 10, 2009 | Husqvarna , No.455 Rancher, 20" Gas -...

2 Answers

I have a husqvarna 55. I put in a new carb, coil,

Preset both needles about 1-1/2 to 2 turns CCW from CW stop. Set H needle first after warm-up. At high speed, engine should 4-stroke with no load, but smooth out with light load(cutting wood). Set idle speed so that it will keep running, then adjust L needle so that engine tries to follow the throttle, but idles fairly smoothly. Readjust idle speed so that the clutch is not trying to drive the chain.

Aug 02, 2009 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

Poulan 18' model 2000 chain saw, quit running , will not start.

If you have a compression gauge, check the compression. Anything under 90psi is too low.

Check your flywheel key. If it is broken the flywheel will move and not fire at the correct time.

Note: if it does not sputter with carb cleaner then it's not your carb.

Remove your exhaust manifold. Look into the cylinder with a flash light. You are looking for scratches. Anything larger then a light fingernail is definite proof you need a new cylinder/piston assy.

If it passes that test do the following:

Pour mixed fuel straight into your cylinder until 1/4 full. Slowly pull your saw over while looking into the cylinder. If you see bubbles after the ring/rings go by then you need a new cylinder/piston assy. On rare occasions if no scratches are present on the cylinder wall or piston, you may be able to change just the rings.

Mar 31, 2009 | Poulan Pro Chain Saw 46cc 20"

2 Answers

Will not start after setting 4 years

the 455 rancher chain saw is a two cycle motor.Two cycle motors do not have valves in them.Stihl in another matter.Take the muffle off the saw and look to see what the piston rings look like.If they are brownish in color then you need to thak the cylinder head off and clean the piston and rings. usualy it is carbon and old oil.Hogwash works very well in this situation.Use only your hand to rub the hogwash around the piston.Even thought this doesn't sound like your problem.The trouble will be in the car. itself.The gas that was in the carb is on longer.You will need to replace the diaphram and gaskets in the carb.Once you do this the fuel will get to the cylinder.and the saw will fire.Make sure that you ran the oil mixture on the heavy side for the first tank of fuel.This will oil the bearings down in side the crank case.they way be gummed up from sitting for so long.After the first tank of fuel is used up then use regular mixture.

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

2 Answers


Clean air filter and try starting fluid through air intake if you have spark this will definetely start it......On the rancher , is the air cleaner clean??? Remember that all you need to make an engine run is fuel , air , and an ignition source .. When you attempted to start the Husqavrna by adding fuel to spark plug chamber this actually causes a no start or very hard start condition it will act like if flooded....What does help if you remove the spark plug pull the pullstart and ensure that no liquid (gas is coming out of chamber) if it is keep pulling until it does not.... then take your spark plug ,after you have cleaned and gapped it, and with a butane lighter heat the tip for approximately 30 seconds and then reinstall plug and give it a yank after you spray starting fluid in the air intake....Good Luck

Jan 08, 2009 | Husqvarna Chain Saw 20" Bar

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