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Yes, it just won't cut as wide.

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Q: Can you put 20 inch mower blade on 21 inch mower?
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How do I replace the blade on a Weed Eater 20 Inch Lawn Mower?

Get some leather gloves and a socket wrench set. Lean the mower over by raising one side so you can gain access to the blade. Be careful not to pour out any fluids. Work from the side of the mower that has the grass discharge (the right side). With something holding the mower at a tilt, grasp the blade with a gloved hand and loosen with the correct socket the nut under the blade that is in the center of the blade. As you loosen the nut, the blade will begin to lower. Be careful that you do not lose any of the mechanism, and notice the way it fits together. Just replace in reverse, but a tip is to put a little bit of grease (very little) on the threads of the bolt that holds the blade. Tighten well. I frequently take off my blade and sharpen it. Are you sure that it needs to be replaced? Can it be sharpened? Remember: "Lefty, loosy; righty, tighty."

How do you drain oil of a 20 inch 4.5 Murray push mower?

Look for a 3/8 drain plug underneath the deck (where the blade is) Loosen. Drain. If no plug is there, remove the oil dip stick and turn the mower on the side until all the oil is out.

What size wiper blade for 2004 VW Jetta?

20 pr 22 inch 20 pr 22 inch

Changing the oil on a Weed Eater 20 Inch push Lawn Mower?

Drain plug is next to the blade Place a ratchet head into the square plug and drain oil Replace plug and replace oil

What type of oil is used in a Murray 4.5HP 20-inch mower?

Straight 30 weight

Can you put 20 inch tires on 15 inch rims?

Of course not. You need 20 inch wheel to mount 20 inch tires.

What size tire should a put 20 inch bmx bike?

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How much oil does a Murry 4.5 20- inch mower use?

20oz which is LESS than a quart of oil.

What kind of oil does a Murray 4.5HP 20-inch mower use?

my oners manuel says 30wt regular oil or a 5-20 synthic

How much did medieval swords weigh?

Depends entirely on the materials used, the type of sword, type of steel, width, length, blade thickness, etc. For comparison, I have a shortsword, 1075 high carbon steel, 20 inch blade, 5 inch handle, not sure of the blade thickness, 1 3/4 inch wide blade. it weighs a little over 3 lbs.

Why will Weed Eater 20 Inch Lawn Mower will start but will not stay running?

clean the air filter air is being restricted

Where is the air filter on a Murray 4.5HP 20-inch mower?

The air filter is located inside the canister that is attached to the top of the carburetor.