Husqvarna Model 40 chainsaw Low rpm's only


Old 10-05-05, 01:21 PM
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Husqvarna Model 40 chainsaw Low rpm's only

Husqvarna Model 40 chainsaw Low rpm's only.

I inherted this chainsaw. I have no idea of what its history may have been.
It will start fairly easy however if I try and get it to go to High rpms, it will bog down and stall out.

I have never owned a chainsaw before so I do not know what to check. However I do have a download of the owners manual and have check the followning.

Proper oil/gas with new gas.
I have the proper oil in the automatic oiler.
The chain moves freely on the bar when not running.
I have checked the air filter and is clean and oiled

The anti-kick back is free to move therefor not engaged. (This is correct??)

I have taken off the anti-kick/ clutch cover and the clutch will move if pried with a screw driver.. So I believe that is correct.

I did find that I have broken hose that goes from the top of the gas tank left side to somewhere in the right side of the carb and then down. But to what I have no idea.

Well that all I can think of now.
Does the carb need to be changed?
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Old 10-05-05, 06:50 PM
Join Date: Oct 2004
Location: USA
Posts: 255

Replace the cracked vent hose. If this don't do it you will need to clean/rebuild the carb. It's very simple and easy to do. No need to buy a new one.

Also, look for a restricted muffler. If you can rev it up without the muffler then replace it (may be loud when testing,though)!

God Bless,
Old 10-05-05, 08:36 PM
v8driver's Avatar
Join Date: Sep 2005
Posts: 767
carb rebuild is easy, i'd do that as well anyway, but yeah, do pop the muffler off, and check the spark arrestor if it has one as well.
Old 10-06-05, 02:56 AM
puey61's Avatar
Join Date: Apr 2004
Location: Upstate New York
Posts: 3,224
Be aware that if you do in fact have excessive carbon build-up on the arrestor screen you may as well have build-up in the exhaust port of the cylinder and this too needs to be checked/cleaned. If you intend to service the carburetor, pull it off and let us know what brand, model and serial number the carb is and I can supply you with the rebuild kit part number. You should also replace the mounting gasket, if applicable (some have a rubber intake manifold instead of a gasket).

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