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The purpose of the 738-04124A Shear Pin is to protect your snowblower.
If the auger gets jammed or clogged, the Shear Pin is designed to snap at a certain point of pressure, so it will not damage any other part of the unit.
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.
Washers help to spread the load, and prevent damage to the surface being fixed, or provide some sort of insulation such as electrical. Washers can also be important for preventing galvanic corrosion.
This part is compatible with the various mowers that are listed below.
The purpose of the 16221-883-800 Carburetor Gasket is to prevent an air leak, which would cause the engine to run poorly.
It is advised to replace these gaskets when replacing or repairing the carburetor.
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