This is a genuine OEM replacement part, it sold individually.
The primary purpose of this part is to attach the chainsaw bar to the models shown below.
There are two of these Bar Mounting Nuts used on the saws.

This part is also used on Husqvarna and Craftsman Chainsaws.

This is an OEM replacement part and is sold individually.
Its propose is to deliver an electric current from an ignition system to the combustion chamber of a gas fueled engine.
It will ignite the air fuel mixture by the spark.
Spark Plugs will usually have to gapped to the manufactures specifications found in the owners manual.

Over time a Spark Plug will become fouled because the air/fuel ratio may be set wrong,worn piston rings, carbon build up and other factors.
It is better to replace a fouled spark plug, rather then trying to clean it.

This is a genuine Husqvarna replacement part, it is sold individually.
The Fuel Filter is inside of the fuel tank.
Its purpose is to filter out dirt and other debris from contaminating the carburetor.

It will at sometime become clogged and restrict the fuel getting to the carburetor,and will have to be replaced.

We do have an article and video on How to Replace the Fuel Filters in Your Outdoor Power Equipment..

You can see this by going to the front page of our site and clicking on Repair Center.

Genuine OEM replacement part used with some Husqvarna Power Equipment. This item is sold individually. A spark plug is used to deliver electric current from an ignition system to an internal combustion engine. After time spark plugs will become dirty or fouled. It is a good idea to replace the spark plug once this happens. You should gap your spark plug according to the owners manual of the outdoor product you have.

Genuine Husqvarna replacement part, this part is sold individually.
The 503939601 Air Purge does just what the part name says.
It purges the air out of the carburetor.
Then it forces fuel from the fuel tank and fuel line in to the carburetor.

This is a genuine OEM replacement part, it is sold individually.
The Fuel Filter is inside of the fuel tank.
Its purpose is to filter out dirt and other debris from contaminating the carburetor.

It will at sometime become clogged and restrict the fuel getting to the carburetor,and will have to be replaced.

We do have an article and video on How to Replace the Fuel Filters in Your Outdoor Power Equipment..

You can see this by going to the front page of our site and clicking on Repair Center.