Changing the Spark Plugs on an MTD Snow Blower

The spark plug on your MTD brand snow blower is required to ignite the fuel and air mixture that enters the engine's cylinder for combustion. The center electrode on the spark plug can wear down after many uses. If the gap between the side electrode and center electrode is too large, a spark will may not form. You can check the gap of the spark plug with a spark plug gap tool. If the gap is too large, per your manufacturer's recommendations, you need to replace the spark plug with a new one.


MTD recommends replacing the spark plug before every winter. You can also check the gap of the spark plug with a spark plug gap tool. If the gap is still at the proper setting, you won't need to replace the spark plug. When you replace the spark plug, set the gap of the new spark plug to the manufacturer's recommendations.


Remove the ignition key from the snow blower. Locate the spark plug protruding from the side of the engine. Disconnect the rubber spark plug boot from the spark plug. Use a socket wrench to unscrew the spark plug from the cylinder head.


Use a spark plug gap tool to set the gap of the new spark plug to the engine manufacturer's recommendations. Thread the spark plug into the spark plug hole in the cylinder head. Tighten it with the socket wrench, but do not over-tighten or you may run the risk of cracking the porcelain casing on the plug. Firmly reconnect the spark plug boot so it's secure on the plug.


Turn on the snow blower to see if it starts properly and runs smoothly. If the snow blower doesn't start, check the spark plug boot connection. If the snow blower sputters or stalls, you may have set the gap to wide on the new spark plug.