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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.

Bow Tie Cotter Pin

Honda air cleaner (or air filter). If the air filter is clogged or dirty, the engine may not start or may run rough.

NGK 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.

Fuel bowl gasket

Small engine Champion spark plug (RJ19LM). If the engine does not start, the spark plug may be defective. The spark plug should be replaced periodically during regular maintenance.

Genuine MTD 742-0305A-0637 Articulating Roto-Tiller Tine

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.

Carburetor gasket

Fuel cap assembly

Carriage Bolt: 5/16-18 x .750"

Replacement clutch kit

MTD flange lock nut, 5/16-18.

Two cycle engine carburetor. If the engine runs rough, the carburetor may be restricted. The carburetor can often be cleaned or rebuilt, but sometimes it may need to be replaced.

Cap assembly- fuel tank
If you’re serious about your garden, a Yard-Man tiller, like the 21AB454B701 model, is what’s required to get the job done right. To keep your tiller on the job for this season and the next, you’re going to need genuine manufacturer replacement parts and that’s what you’ll find at Repair Clinic. From spark plugs and carburetor components, to roto-tines, throttle levels, and control cables, we can quickly ship you the specific MTD parts that match your Yard-Man tiller. To get started, enter the full model number of your equipment in our website’s search bar to see a complete list of compatible parts. You can then refine that list down to the exact part you want by using the part category and part title filters. Keep in mind, you can always contact our Customer Service Team at 1-800-269-2609 if you need some personal assistance in locating the right part for your Yard-Man equipment.
Of course, the support doesn’t end with having the right part in hand. Repair Clinic curates a comprehensive repair help library of instructional videos, articles, and model-specific schematics to guide you through troubleshooting the problem you may be experiencing and the step-by-step process to complete the repair. With Repair Clinic as your partner, your Yard-Man tiller will always be ready for action.