Changing Blades On Bad Boy Mower [Quick Step-by-Step Guide]

By | April 1, 2023

YardSimply is supported by readers like you. We may earn an affiliate commission if you purchase through links on our site. Learn why you can trust us here.

As a Bad Boy lawn mower owner, it’s important to know how to change the blades on your mower. This helps ensure you always have a nice sharp cut and prevents brown tips on your grass from dull edges.

Here are some easy steps to follow when changing blades on Bad Boy mowers.

How To Start Changing Blades On A Bad Boy Mower

If you own a Bad Boy lawn mower, it’s important to know how to change the blades. Over time, the blades can become dull or damaged and need to be replaced to keep your lawn looking its best.

This process is not difficult, but there are a few things you’ll need to gather first, including new blades and some basic tools. Follow the steps below and you’ll have new blades on your mower in no time!

Check The Condition Of Mower Blade

The most important part of keeping a lawn mower in good condition is making sure the blade is sharp and properly maintained. Lawnmower blades take a lot of abuse, hitting rocks, sticks and other debris hidden in the grass. Over time, this can cause them to become dull or damaged.

Checking the condition of your mower blade regularly will help extend its life and keep your lawn looking its best.

Bent Bad Boy Mower Blade

If you notice that your Bad Boy mower isn’t cutting as well as it used to, there’s a possibility that the blade is bent. While mowing, this can happen if you hit a hard object, like a rock or tree root.

Before doing any work under your mower’s deck, be sure to take safety precautions such as removing the spark plug wires and wearing gloves. You can check for a bent blade in one of couple different ways:

Check for a bent Bad Boy blade by removing it:

First, remove your Bad Boy blade from the mower to check if it is bent. Next, grab hold of the ends of the blade and examine the spindle case for any damage. Move the blade back and forth to see if there is any movement or knocking sound coming from within the housing.

If you discover any damage to the spindle housing, replace it immediately. This could occur if you strike a hard object while mowing. Finally, compare the new mower blade to the old one.

Your blade is likely bent and needs to be replaced with a new one if there is a space between them when they are placed together side-by-side.

Check for a bent Bad Boy blade without removing it:

Wearing on the Bad Boy Blade Sail

The sail on a mower blade is important for several reasons. First, it helps to generate airflow beneath the mower deck. This airflow, along with the deck shell and baffles, creates suction that holds grass in place so the blade can provide a clean cut.

Second, the sail protects the blade from dirt and debris that could otherwise cause damage or deterioration. If the sail has degraded to the point where it is thinner than the core of the blade, then it needs to be replaced.

Chips & Gouges in Your Bad Boy Blade

Hits from stones and other heavy items can cause nicks in the edge of blades. This could affect how well your Bad Boy mower cuts. Usually, sharpening the blade will smooth out small chips. Large nicks and gouges in the blades require replacement

Cracked Bad Boy Mower Blade

If you notice a cracked mower blade, it is important to replace it as soon as possible. A damaged blade can easily break while the mower is in use, posing a risk of injury or damage to people and nearby structures.

Additionally, cracks in the blades can cause uneven cutting and leave your lawn looking patchy. Be sure to select a replacement blade compatible with your lawnmower model for optimal results.

Items That Can Prematurely Wear & Damage Your Bad Boy Blade

I suggest changing the blades on your bad boy mower every two to three months, depending on how often you use it. If you notice any corrosion or damage, don’t hesitate to replace them sooner.

When maintaining a 2-acre lawn, it’s essential to take precautions to protect both your lawn and mower. Prior to mowing, walk through the area and remove any obstacles, including toys, sticks, and rocks, which could be damaged by the mower or potentially harm the equipment.

In sandy patches, consider promoting a thicker growth of grass to shield the soil and minimize sand and debris from causing premature wear on your mower blades. By adopting these practices, you can help ensure a healthier lawn and extend the life of your mower while tending to your 2-acre property.

Sand and debris can cause your blades to wear prematurely, but there really isn’t much you can do about this other than grow a thicker blanket of grass to cover your lawn to reduce the amount of dirt being sucked into the mower deck.

How to Remove & Install Your Bad Boy Mower Blades

Gather Tools Required to Change Bad Boy Mower Blades

  • Socket wrench
  • Work gloves
  • Safety Glasses
  • Torque Wrench
  • Block of Wood

Take safety precautions

When operating a lawnmower, it is important to take safety precautions in order to avoid injury. Always confirm that the spark plug boot is unplugged and, if your mower has a key, remove it before handling the blades.

It is also advisable to wear gloves when working with the blades. In addition, be aware of where you are mowing in relation to power lines or other potential sources of sparks or ignition.

Access the underside of the mower deck

To access the underside of your mower deck, first use wheel chocks to secure the lawn mower in place. Next, you can either use ramps or a lift made specifically for your zero turn model.

Be cautious while working below the deck and make sure everything is firmly in place before proceeding.

To stop the lawn mower from moving while you work, be sure to engage the brake and use wheel chocks on both sides of the wheels.

Remove the blade bolts

To remove the blade bolts, you’ll need a socket wrench. If the blades are still mounted to the deck housing, place a block of wood between the deck housing and the blade to stop it from rotating while you use the socket wrench to remove any mounting hardware, such as bolts and washers.

Take care not to lose any components in the process. Once all of the hardware is removed, you should be able to take off the blades by hand easily.

Remove your Bad Boy mower blades

When you remove the blade, you should be aware of its location. The blade’s sharp edge on the new one may be mounted in the same direction, often with the assembly being turned counterclockwise. Pay close attention to how this blade is placed, then replace the new edge appropriately.

Install Your Bad Boy Mower Blades

The majority of mower designs forbid installing the mower blade with the wrong side down. Majority of blades has a retaining plate that prevents the blade from being installed anywhere other than the proper location. However, mower blades can be installed improperly.

Additionally, a blade can occasionally be installed too loosely. A poor installation will become apparent very quickly due to vibration and subpar lawn cutting performance; in contrast, a properly fitted installation should go unnoticed by users until it is time for maintenance or replacement again.

Clean area under your deck

A clean area under your deck is important for several reasons. First, it helps the new blades to be properly balanced when installed. Second, it keeps old blades from becoming dull too quickly.

Third, it makes it easier to see any potential problems with the deck itself. Finally, fourth, and most importantly – a clean area under your deck simply looks nicer!

Use a putty knife or other tool to scrape away any debris that has built up over time; then sweep or vacuum up the loose dirt and dust before proceeding with installing new blades or sharpening old ones.

Install blades

When it comes to installing blades, there are a few things you need to keep in mind. First and foremost, be sure that the area you’re working in is clean and free of dust or debris.

Old blades can often times be sharp, so it’s important to take care when handling them. Newer blades should also be inspected for any potential problems before installation. 

The blade must be installed correctly; they can fit upside down. The center will be located higher than the edge’s ends if the edge has an offset. To avoid damage when the nut securely tightening, you must ensure that the blade fits onto the spline.

Tighten the bolts using a torque wrench

Tightening the bolts on your lawn mower is important to maintaining its edge and preventing injury. Use a torque wrench to properly tighten the bolts, following the manufacturer’s specifications detailed in your owner’s manual.

Be especially careful when tightening the bladebolt – use a block of wood to help prevent it from turning as you twist the nut tight. Inspect other parts of your mower, like belts and pulleys, before each use to make sure everything is functioning correctly.

How to Sharpen Your Bad Boy Blade DIY

If you own a Bad Boy lawn mower, you know that the blades need to be regularly sharpened to keep the grass looking neat and tidy.

However, taking your mower into a professional shop can be expensive, so why not sharpen the blades yourself? With a little time and effort, it’s easy to do-it-yourself. Plus, doing it yourself will save you money in the long run.

Gather the tools you will need 

First of all, make sure that you have all of the necessary materials before starting. You’ll need a blade grinder (which can be found at most hardware stores), gloves, safety glasses, and a new or very sharp file.

It’s also important to note that there are different Bad Boy Lawn Mowers, so make sure you’re using the right blade type for your model! 

Clean Bad Boy Blade

The wire brush is the best way to clean bad boy blade of dirt and stubborn areas of buildup. Just put on your safety eyewear and work gloves, then begin scrubbing the grime off with the rag. For particularly difficult accumulation, use a wire brush.

Secure Your Bad Boy Mower Blade

Bad Boy mower blades need to be sharpened regularly to maintain effectiveness. This is an important step in keeping your lawn looking its best.

When sharpeniing the blade, it is important to have a secure workspace with good lighting and no cords in the way that could pose a tripping hazard. The Bad Boy blade must be securely fastened in a vice so that it does not move during the honing process.

Once one side of the blade has been sharpened, it should then be flipped over and secured again beforesharpeningthe other side.

File or Grind Bad Boy Blade Edge to Sharpen

Sharpen with a metal file 

When sharpening a blade with a file, it’s important to use the right angle and direction. Hold the file at an angle to the blade and push it along in one direction only.

Avoid sawing motions, which will damage the file. After getting rid of all burrs and jagged edges, flip the blade over and sharpen the other side. Clamp the blade in a vice when doing this so you can work safely.

Sharpen with a drill powered blade sharpener

A drill powered blade sharpener can be used to sharpen a blade edge quickly and easily. To use the sharpener, simply move it up and down along the length of the blade edge.

Once one side has been properly honed without any rough edges or nicks, flip the blade over and secure it in a vice before repeating the process on the other side.

Sharpen with an angle grinder or bench grinder 

An angle grinder is a great tool to use for sharpening a blade. The blades on most tools get dull over time and will need to be replaced or sharpened. An angle grinder can be used to sharpen the blade by running it along the edge of the blade until all of the rough spots or nicks are gone.

It is important that you hold the angle grinder parallel to the edge of the blade so that you do not remove too much metal from one side.

You should also flip the blade over and secure it in a vice beforeSharpen with an Angle Grinder beginning to sharpen so that you can work on both sides evenly.

How to Balance Your Bad Boy Mower Blade

Before reinstalling your mower blades on your Bad Boy mower, they must be balanced. If you don’t, your crankshaft may vibrate and become damaged. A blade is said to be balanced when each side of it is equally weighed.

Check the balance of your blade using a blade balancer or by following these instructions: 

If you don’t have a blade balancer, you can hammer a nail about 3/4 to 1 inch away from the wall into the wall. The blade’s center should be on the nail head with the point facing up.

The hung weight should match on both sides before trimming any more metal off of the lower hanging side until it balances with equal weights

When Should You Seek a Professional Sharpening Service for Your Bad Boy Blade?

If you’re not entirely confident in your ability to balance or sharpen a blade, you should seek professional assistance.

Your crankshaft or engine could sustain more harm if your blades are not balanced properly or are still worn from use. Even though I have the equipment to sharpen my own mower blades, I personally prefer to have them done by my neighborhood lawn mower dealer.

They simply give the blade a nicer, cleaner edge than I can get cutting it myself. Trust us – an injured person AND broken equipment is NOT what we’re going for here!

Because of the following reasons, you can decide to have a specialist sharpen your blades:

  • It is a far more prudent choice than sharpening the blade on your own.
  • In many cases, the cost of sharpening a blade is lower than the cost of acquiring a new blade.
  • A skilled specialist can remove big nicks and gouges in the steel blade of a mower by grinding it down. This ensures that the blade is correctly balanced. Because of this, your mower’s vibration and wear and tear will be reduced.


As you can see, it is relatively easy to change your Bad Boy mower blades yourself with just a few tools and safety precautions.

Not only does this save you time and money, but it also gives you the opportunity to be sure that the job is done correctly.

Be sure to consult your owner’s manual for manufacturer recommendations specific to your model before beginning any repair project on your lawn mower.

FAQ (Frequently Asked Questions Changing Blades)

How Often Should You Change Your Bad Boy Mower Blades?

It is recommended that you change the blades on your Bad Boy mower every 25 hours of use.

How Often Should You Sharpen Your Bad Boy Mower Blades?

You should sharpen your Bad Boy mower blades every 10 to 20 hours of use, or whenever they become dull.

Do New Bad Boy Mower Blades Need to Be Sharpened?

No, new bad boy mower blades do not need to be sharpened.

Are bolts on mower blades reverse thread?

No, bolts on mower blades are not reverse thread.

What size bolt holds the blades on a Bad Boy mower?

The blades on a Bad Boy mower are held on with a 3/8-inch bolt.