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Champion Spark Plug (RC12YC). The spark plug ignites the fuel and air mixture in the cylinder to power the engine. If the spark plug is burnt, fouled or damaged the engine may not start or may run rough.

Briggs & Stratton Spark Plug (RJ19LM). If the engine does not start or runs poorly then the spark plug may be defective and will need replacement.

MTD Spark Plug. The spark plug ignites the fuel and air mixture in the cylinder to power the engine. If the spark plug is burnt, fouled or damaged the engine may not start or may run rough.

MTD Spark Plug (794-0055A)

Champion Spark Plug (RDZ19H)
The spark plug in your Murray gas-powered Tiller is vital to its performance. A Tiller, also known as rototiller or powered tiller, relies on the spark plug to properly fire for the engine to start. If the spark plug fails to fire properly, it might cause issues with the trimmer and, eventually, the Tiller will not start. You can remove the rototiller spark plug to inspect. Examine the spark plug for dirt, blackening, and grime. If a spark plug is no longer in good condition, it should be pretty obvious. Please see our Tiller Repair Help and Troubleshooting section for more information on replacing your Murray Tiller's spark plug. Our Tiller repair section contains step-by-step directions and videos for replacing the spark plug on your Murray rototiller.
All new Murray spark plugs and other Tiller parts are in stock and ready to ship the same day, right to your door. As a result, Repair Clinic is always nearby to deliver the lawn equipment part you require as soon as possible! Repair Clinic has a comprehensive online catalog of replacement parts for your Murray Power Tiller and all other top brands with the exact part that is guaranteed to fit. Simply enter your Bolen Tillers model number to locate a matching spark plug.
Murray rototiller fuel lines can get clogged, causing the engine to lose power. To avoid this issue, try changing your spark plug as part of routine rototiller maintenance. A good rule of thumb is to change the spark plugs in rototillers every 100 hours of use. It is advisable to replace the spark plug before the engine fails to start.