Husqvarna rancher 455

Hey. Trying to get some
Opinions on why my chainsaw won’t idle. I did some research online and have mostly discovered that my Low idle screw needs to be adjusted. I purchased the spline tool to make the adjustments however this does not appear to be the problem. The saw runs great when full throttle is applied. When I let off the trigger it stalls. I’ve started with the screw totally to the clockwise position and gradually adjusted it counter clockwise and it still stalls. I’ve turned it all the way at gradual intervals until I actually unscrewed it altogether. Any other options for me here before I spend money at the dealer? Thanks In advance for any replies.


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How is it stalling? Idling down and slowly dying? Or abruptly? Have you checked the spark arrestor screen?

I am not familiar with that particular model, but mine has an idle speed adjustment screw. If yours has one, you could try increasing the idle speed. Another obvious thing would be to make sure the air filter is clean. You could also remove the carburettor and make sure there is no debris in it. In the end, if you don't want to bring it to a shop, you could buy a replacement carburettor in a kit for under $50 and replace it yourself. I have done that a couple of times, and it was not difficult and did the job.

You need to adjust the air fuel mixture screw, and the low speed idle screw twice. Here is how I do it with a warm engine with no chock:

1, Adjust the the low speed idle. Turn the screw in or out until it runs at it lowest idle without stalling.
2, Adjust the air fuel screw. Turn the screw in until the idle just starts to drop, then turn it out until the idle just starts to increase, count the number of quarter turns between these two points, then screw it back in 1/2 the number of quarter turns so the screw is 1/2 way between its leanest and richest setting. This should only be one full to two full turns of the screw between these points.
3, Repeat step 1.

Finally, confirm your chock setting is working properly.

If that does not work you have another issue causing the problem.

Clogged idle orifice? Take the idle adjustment screw out and try running a fine wire through the orifice?

I always start by putting a new spark plug and making sure gas is fresh. You should never have to adjust your saw, if you do, I would bring it to the dealer. imo

I have the same saw and idle was a problem with it from day one until I took a drill to the spark arrestor plate on the exhaust. the saw now runs better than it ever has and hasn't effected reliability at all. I cut 3-4 bush cords a year and this is year 4 since drilling the plate out.

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Originally Posted by DanE

I have the same saw and idle was a problem with it from day one until I took a drill to the spark arrestor plate on the exhaust. the saw now runs better than it ever has and hasn't effected reliability at all. I cut 3-4 bush cords a year and this is year 4 since drilling the plate out.

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That is a good idea, would result in less back pressure, can you post a pic of the arrestor plate after it was drilled out please.

Besides not idling properly is it hard to start?

Might need a carb kit

try a little sea foam

I will second that I use a lot of sea foam I think it is worth it.

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Originally Posted by warningshot

try a little sea foam

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Quote:

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Originally Posted by greatwhite

Besides not idling properly is it hard to start?

Might need a carb kit

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No it’s not hard to start.


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Quote:

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Originally Posted by Marker

That is a good idea, would result in less back pressure, can you post a pic of the arrestor plate after it was drilled out please.

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I checked the screen and it is clean.


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