731-2363 Lawn Mower Mulch Plug for MTD Troy Bilt CUB C-adet 38" 42" GT-2542 LT-1040 2150 1600 1515 1517 Lawn Mowers, Replaces 190-116 GW-7311643A 7311643A

What It Is

This is a metal mulch plug designed to block the discharge chute on select MTD, Troy-Bilt, and Cub Cadet lawn tractors, converting side-discharge mowers into mulching mowers. It forces grass clippings to recirculate under the deck for finer cutting and natural fertilization.

Fitment & Compatibility

Before buying, confirm your mower has a 37–42 inch stamped steel deck (not fabricated). This plug fits specific models including Cub Cadet GT-2542, LT-1040, 2150, 1600, 1515, 1517; Troy-Bilt 38" and 42" tractors; and MTD 700, 800, 900 series with 42" decks. It replaces OEM part numbers 190-116, GW-7311643A, and 7311643A. Do not assume universal fit—measure your deck’s discharge opening width (roughly 6–7 inches) and verify the mounting tab pattern matches. Check your mower’s model number (stamped under the seat or on the frame) against the manufacturer’s compatibility list.

Key Things to Know

• Construction: Heavy-gauge steel with a powder-coated finish—holds up better than plastic plugs, but can rust if paint chips.
• Installation: Tool-free—slides into the discharge opening and locks with a spring-loaded pin or wing nut. Takes under 5 minutes.
• Common gotcha: Some decks require removing the existing side-discharge chute first. If your deck has a fixed chute, this plug won’t work without an adapter.
• Performance: Works best with a sharp mulching blade (sold separately). Dull blades or wet grass will still leave clumps.

Should You Buy It

If you own a compatible MTD/Troy-Bilt/Cub Cadet tractor with a 38–42" stamped deck and want to mulch without buying a full mulching kit, this is a cheap, durable solution. Skip it if your deck has a different opening shape or if you need a complete mulching system (blade + plug).