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What kind of spark plug does a Lawn Boy mower take?

Dennis WaldenNov 24, 2021

MaxPower's 334059 spark plug for Lawn Boy engines replaces Champion CJ14; Autolite 258; NGK BM4A.

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Consequently, what kind of spark plug do I need for a push mower?

Ideally, most automobile spark plugs use a thread size of about 14mm thread why those of lawn mower range between 10 to 12 mm. Because of these differences in thread sizes, they just won't fit into the same hole or the unit in which the plug is to be fit in.

Similarly one may ask, do all push mowers use the same spark plug? Yes there are different plugs for different engines. Usually you need the engine model on your mower, and take in the old spark plug to the hardware store. Ask for someone to help you find the right spark plug and tell them your engine model and mower model.

In this manner, do you need a specific spark plug for lawn mower?

Lawn mower gasoline engines and automobile gasoline engines both use spark plugs to ignite the fuel/air mixture in their cylinders. ... Some automotive and lawn mower spark plugs may be interchangeable, but many others are not because of physical differences.

How much oil goes in a lawn boy?

Slowly pour 20 ounces of SAE 30 motor oil into the fill tube. Lawn Boy calls for a 32:1 gas/oil ratio when using its own brand of two-cycle engine oil. That is equal to 4 ounces of two-cycle engine oil per gallon of gas.

How do you service a Lawn Boy mower?

Will a lawn mower start with a bad spark plug?

A dirty or fouled spark plug can cause your lawn mower to not start. It can also work itself loose, causing issues. If the spark plug appears to be seated correctly but the engine doesn't start, a new one may be in order.

When should I change my lawn mower spark plug?

For standard lawn mower and small engine maintenance, you should check and/or replace spark plugs:

once a season.
every 25 hours of use.
if your lawn mower our outdoor power equipment won't start.

How can you tell when a spark plug is bad?

What signs are there that your spark plugs are failing?

Your car is a rough starter. ...
Your car is a rough idler. ...
Your engine will sometimes misfire. ...
Your engine surges. ...
Your fuel consumption is higher than usual. ...
Your car isn't accelerating as it should.

What size socket do I need to remove a lawn mower spark plug?

Drive socket wrench in 1/2 inches or 3/8 inches, whichever is appropriate for your machine. New spark plug.

What happens if you use wrong spark plug?

If the spark plug fires at the wrong time, this could lead to constant rattling, pinging or knocking sounds. Hard vehicle start. If your car is having trouble starting or just feels disjointed and jerky, your spark plugs may not be working right, and this can lead to misfires and erratic performance.

How do you get a broken spark plug out of a lawn mower?

To remove the plug, move the piston to Bottom Dead Center, and make sure the engine is cold, even if you have to wait for cool-down. Then soak the broken plug shell with a generous amount of penetrating oil. Give it a few minutes to work, then tap an appropriately sized easy out firmly into the empty shell (Figure 3).

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About The Author

Dennis Walden

Dennis owns a small farm and loves to grill since his early childhood. He’s a professional cook, but hiking and enjoying the great outdoors is his no less favorite part of life.