Do It Yourself Lawnmower Tuneup

DIY Lawnmower Tune-up

With spring just around the corner in most areas, and the grass already growing in many states, people are starting to think about the lawnmower setting in the garage or maybe even under the snow. They're all thinking the same thing: Will my lawnmower start up when I need it? But before you go out and attempt starting it, you owe it a tune-up. If you're the DIYer type, you can save yourself some cash and tune up your self-propelled or push lawnmower on your own.

A basic tune-up consists of:

• Oil change
  
• Air filter maintenance (replacement/cleaning)
  
• Spark plug maintenance (replacement/cleaning)
  
• Blade sharpening

Of those four, an oil change and air filter maintenance are by far the most important steps. Dirty, old oil will drastically shorten a 4-stroke engine's lifespan. A dirty or worn-out air filter will greatly reduce engine performance, and is one of the top factors in premature engine failure. Fouled spark plugs will decrease performance, and will not burn fuel as cleanly. And last, but not least, a dull blade will overload the engine, contributing to early failure, and will not produce the smooth, clean cut which is required for a beautiful lawn.

Tools you will need:

• 3/8" drive ratchet wrench
  
• Adjustable wrench
  
• Spark plug (deep) socket - most common size is 13/16",
  can vary
  
• Socket for blade removal - usually 9/16" or 1/2"
  
• Bench grinder
  
• Screwdrivers
  
• A shallow pan to catch the oil, an old skillet works best
  
• A pair of leather gloves

Additional items you need:

• Engine Oil (Consult the engine owner's manual to determine correct
  type and quantity)
  
  

Now that you have the tools together, we're ready to begin.

Step 1: Remove the spark plug.

Using the ratchet wrench and the correct socket, remove the spark plug. First inspect it for cracks, then using a small wire brush, thoroughly clean the plug. Do not use sandpaper. If the plug is very black, has a lot of buildup or appears very old, it is a good idea to simply replace it. You can pick up a new one for around $3.00 at a lawnmower dealer or a local hardware store. Whether you've cleaned the plug, or bought a new one, lay it aside for now. Do NOT reinstall it yet.