Bad Boy MZ Magnum 54 Guide

For additional information, please see us at
www.badboymowers.com
Bad Boy, Inc.
102 Industrial Drive
Batesville, Arkansas 72501
©201611-28
MZ MAGNUM 54
ZERO-TURN MOWER
OWNER’S, SERVICE & PARTS MANUAL

TABLE OF CONTENTS
PAGE 2
Basic Information
Bad Boy Safety Guidelines
Operation
Maintenance
Storage and Transportation
Troubleshooting and FAQ
Controls
Moving In-operable Mower
Instrumentation
Mower Blade Maintenance
Greasing Bearings
How To Choose the Right Blade
Mowing Tips
Service Section
Parts Section
Limited Warranty
Page 4
Page 5
Page 9
Page 10
Page 10
Page 12
Page 13
Page 14
Page 14
Page 15
Page 15
Page 16
Page 17
Page 18
Page 32
Page 50
Section 1
Section 2
Section 3
Section 4
Section 5
Section 6
Section 7
Section 8
Section 9
Section 10
Section 11
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This manual applies to the following equipment:
Bad Boy MZ MAGNUM 54
MZ Magnum 54˝ KT740 Kohler
COMMONLY USED ITEMS AND PART NUMBERS

SECTION 1: BASIC INFORMATION
Congratulations on the purchase of your new Bad Boy Mower! The purpose of this manual is to assist
operators in maintaining and operating their machine. The information and instructions in this manual can
help you attain years of performance from your new Bad Boy. Also, check out our website to learn more
about the Bad Boy family.
1.1
1.2
1.3
1.4
All Bad Boy engines use 10W-30 engine oil. For maximum protection, Bad Boy synthetic blend
engine oil is recommended.
All Bad Boy Mowers use hi-temp multi-purpose grease. NLGI No. 2 for the grease fittings. MZ
models have 12 psi in both front and rear tires.
Most Kohler engines hold approximately two (2) quarts of motor oil. Be careful not to over fill engine oil.
Refer to the engine’s service manual.
WarrantyRegistration
The Warranty Registration form must be completed within 30 days to validate your warranty. As the new
equipment owner, you are expected to see that the form is completed and forwarded to Bad Boy, Inc., at
time of delivery. Warranty is non transferable. Warranty registration should be completed by the
selling dealership using the on-line registration site.
Model/Serial Number
Your MZ model serial numbers are found on the SIN plate underneath seat. These numbers can assist
you in the ordering of new parts when replacements become necessary.
Parts/Service
Only Bad Boy replacement parts are to be used on your mower.
Replacement parts are available through your local Bad Boy Mower Dealer. Remember to always provide
the following information when ordering parts:
1. Correct part number
2. Correct serial number
All warranty repair and service must be handled through your authorized Bad Boy Mowers dealer.
To locate the nearest dealer, go to our website and click on Locate a Dealer.
EVAPORATIVE EMISSION CONTROL WARRANTY STATEMENT
Federal Evaporative Emission Control Warranty: Your Warranty Rights and Obligations
The Environmental Protection Agency (EPA), and Bad Boy Inc. are pleased to explain the evaporative emission control system’s warranty
on your 2017 equipment. New equipment that uses spark ignition engines for off-road use must be meet stringent anti-smog standards.
The evaporative emission control system on your equipment is designed, built, and equipped so it conforms at the time of sale to the
ultimate purchaser with the requirements of 40 CFR 1060. The evaporative emission control system is free from defects in materials and
workmanship that may keep it from meeting said requirements. Bad Boy Inc. must warrant the evaporative emission control system on
your equipment for two years provided there has been no abuse, neglect or improper maintenance. If an evaporative emission control
system component does fail in a manner that would cause the equipment to no longer meet the requirements of 40 CFR 1060 within the
first two years Bad Boy Inc. will replace the defective component. Your evaporative emission control system may include parts such as
fuel tanks, fuel lines, carbon canisters, fuel caps, valves, vapor hoses, clamps, or connectors.
PAGE 4

SECTION 2: MOWER SAFETYGUIDELINES
Never allow untrained people to operate this machine. It is the owner’s responsibility to get training and see to it that anyone who has
permission to use your machine receives the proper training. Do not mow around people. The factory discharge chute is designed
to deflect debris downward, but it could be possible for debris to be thrown in a way that can cause damage to people or property.
Seek additional training when possible to learn more about safety techniques and practices. This cutting machine is capable of
amputating hands and feet and throwing objects. Failure to observe the following safety instructions could result
in serious injury or death.
GENERAL OPERATION
2.1 Read, understand, and follow all instructions on the machine and in the manual before starting.
2.2 Do not put hands or feet near rotating parts or under the machine. Keep clear of the discharge opening at all times.
2.3 Always remain seated while operating the machine. If the machine is equipped with Roll Over Protection (ROPs), always buckle
your seat belt.
2.4 Only allow responsible adults who are familiar with the instructions to operate this machine.
2.5 Clear the area of objects such as rocks, wire, toys, etc., which could be thrown by the blades.
2.6 Always maintain a safe distance from people and pets just prior to, and during, operation. Stop the machine if anyone enters the area.
2.7 Never carry passengers.
2.8 Do not mow in reverse unless absolutely necessary. Always look down and behind before and while backing.
2.9 Never direct discharged material toward anyone. Avoid discharging material against a wall or obstruction as material may
ricochet back toward the operator. Stop the blades when crossing gravel surfaces.
2.10 Never operate the machine without the discharge chute, grass catcher, or other safety devices correctly in place and functioning
properly.
2.11 Slow down before turning.
2.12 Always disengage blades, place steering controls in neutral, engage parking brake, and remove ignition key when leaving
operators seat. Never leave a running machine unattended.
2.13 Disengage blades when not mowing. Shut off engine and wait for all parts to come to a complete stop before cleaning the
machine, inspecting the machine for damage, removing the grass catcher, or unclogging the discharge guard.
2.14 Always operate machine in daylight or with adequate working lights.
2.15 Do not operate the machine while under the influence of alcohol or drugs.
2.16 Watch for traffic when operating near or crossing roadways.
2.17 Always wear eye protection when operating or servicing the machine.
2.18 Always wear ear protection, such as earplugs, while mowing.
2.19 Use extra care when loading or unloading the machine into a trailer or truck.
2.20 Be alert of surroundings. Watch for rocks, stumps, mounds, depressions, and low hanging limbs or objects that could be
potentially hazardous while mowing.
2.21 Data indicates that operators 60 years of age and above are involved in a large percentage of riding mower related injuries.
These operators should periodically evaluate their ability to operate the riding mower safely enough to protect themselves and
others from serious injury.
PAGE 5

2.24 Mow up and down slopes, not across.
2.25 Watch for holes, ruts, bumps, rocks, or other hidden objects that tall grass can obscure. Uneven terrain could overturn the machine.
2.26 Choose a low ground speed when operating the machine on a slope.
2.27 Do not mow on wet grass, the tires may lose traction.
2.28 Do not attempt to coast down a slope in the neutral position.
2.29 Avoid starting, stopping, or turning on a slope. If the tires lose traction, disengage the blades and proceed slowly, straight
down the slope.
2.30 Keep all movement on slopes slow and gradual. Sudden changes in speed or direction could cause the machine to roll over.
2.31 Use extra care while operating machine with grass catchers or other attachments: they can affect the stability of the machine.
Do not use on steep slopes.
2.32 Do not try to stabilize the machine by putting your foot on the ground.
2.33 Do not mow near drop offs, ditches or embankments. The machine could suddenly roll over if a wheel goes over the edge or
the edge caves in.
2.34 Be aware of what is located at the bottom of slopes. For example: rocks water, cliffs, and roadways.
CHILDREN
Tragic accidents can occur if the operator is not alert to the presence of children. Children are often attracted to the machine and the
mowing activity. NEVER assume that children will remain where you last saw them.
2.35 Keep children out of the mowing area and in the watchful care of a responsible adult other that the operator. 2.36 Maintain
alertness and turn machine off if a child enters the area.
2.37 Before and while backing, look behind and down for small children.
2.38 Never carry children, even with the blades shut off. They may fall off and be seriously injured or interfere
with safe machine operation. Children who have been given rides in the past may suddenly appear in the mowing area for
another ride and be run over or backed over by the machine.
2.39 Never allow children to operate the machine.
2.40 Never leave key in the ignition, especially around children.
2.41 Use extreme care when approaching blind corners, shrubs, trees, or other objects that may block your view
of a child.
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2.22 If your machine is equipped with an actuator motor, raise the deck using the raise /lower switch. Refer to section 7 (Controls).
2.23 If your machine is equipped with a foot pedal, press foot pedal to raise deck, select your desired deck height with the deck
SLOPE OPERATION
Slopes are a major factor related to loss of control and tip over accidents, which can result in severe injury or death. Operation on all
slopes requires extra caution. If you cannot back up the slope, or you feel uneasy on it, do not mow it.
When deck is raised, set desired height with the deck height control dial, then lower deck with the raise / lower switch.
height dial, then slowly release foot pedal.
SETTING DECK HEIGHT

SERVICE:
SAFE HANDLING OF GASOLINE
To avoid personal injury or property damage, use extreme care in handling gasoline. Gasoline is extremely flammable and the vapors
are explosive.
2.47 Extinguish all cigarettes, cigars, pipes, and all other sources of ignition.
2.48 Use only an approved gasoline container.
2.49 Never remove gas cap or add fuel with the engine running.
2.50 Allow engine to cool before refueling.
2.51 Never fuel the machine indoors.
2.52 Do not store machine near open flame or source of ignition, such as a water heater or furnace.
2.53 Remove gas powered equipment from the truck or trailer and refuel it on the ground. If this is not possible, then refuel such
equipment with a portable container, rather than from a gasoline dispenser nozzle.
2.54 Never fill gasoline containers inside a vehicle or on a truck or trailer bed with a plastic liner. Always place containers on the
ground away from your vehicle before filling.
2.55 Keep the nozzle in contact with the rim of the fuel tank or container opening at all times until the fueling is complete. Do not
use a nozzle lock-open device.
2.56 If fuel is spilled on clothing, change clothing immediately.
2.57 Never overfill fuel tank. Replace gas cap and tighten securely. Tank is full when level reaches bottom of fill tube.
GENERAL SERVICE
2.58 Never operate machine in a closed area where dangerous carbon monoxide fumes can collect.
2.59 Keep all nuts and bolts tight to be sure the equipment is in safe working condition. Never operate a poorly maintained machine.
2.60 Do not touch hot areas of the machine.
2.61 Never interfere with the intended function of a safety device or reduce the protection provided by a safety device. Check their
proper operation regularly.
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TOWING
2.42 Tow only with a machine that has a hitch specifically designed for towing. Do not attach towed equipment except at the hitch
point.
2.43 Follow the manufacturer’s recommendation for weight limits for towed equipment and towing on slopes.
2.44 Never allow children or others in or on towed equipment.
2.45 On slopes, the weight of the towed equipment may cause loss of traction and loss of control.
2.46 Travel slowly and allow extra distance to stop.

2.71 Always maintain the correct tire pressure. Do not inflate the tires above the recommended pressure. Never weld or heat a wheel
and tire assembly. The heat can cause an increase in air pressure resulting in a tire explosion. Welding can structurally weaken
2.72 Park machine on level ground. Never allow untrained personnel to service machine. Understand service procedure before
doing work.
SAFETYINTERLOCK SYSTEM
Your Bad Boy mower is equipped with a safety interlock system. This system is designed to prevent serious injury or death to the
operator and other people or property damage. The system consists of an operator presence switch in the seat, the parking brake,
drive lever neutral position, the mower blade engagement switch, and the ignition switch.
These interlocks are vitally important and must be tested frequently. Following are instructions to test these very important safety
precautions. Note: the operator must be seated properly on the machine during these tests and the engine should
have been previously allowed to warm to operating temperature.
2.74 With the parking brake engaged, bring lever arms to their inward position Attempt to start the machine with the blade actuator in
off position. The engine should not start.
2.75 On a level surface, disengage the parking brake and place lever arms to their outward position. Then,attempt to start the
machine with the blade actuator in off position. The engine should not start.
2.76 Engage parking brake and leave lever arms in outward position. Put blade actuator in the on position, then attempt to start the
machine. The engine should not start.
2.77 Next, start the engine as stated in the Mower Operation Section. Disengage parking brake and,Very Slowly,begin to rise from
the seat.The engine should stop.
If any of these tests fail to produce the results indicated and the problem cannot be identified, contact your Bad Boy Mower
dealer or the support contacts in the rear of this manual.
PAGE 8
2.62 Keep the entire machine free of grass, leaves, or other debris build up. Clean up oil or fuel spillage and remove any fuel soaked
debris. Failure to do so can affect the safety and functionality of the machine, as well as increase the danger of a fire due to
contact with the hot surfaces of the machine.
2.63 Allow machine to cool before storing.
2.64 If you strike something with the mower, turn the mower and blades off, engage the parking brake, and inspect the machine for
damage. Repair, if necessary, before resuming.
2.65 Never make any adjustments or repairs with the engine running.
2.66 Check grass catcher components and the discharge guard frequently and replace with manufacturer’s recommended parts,
when necessary.
2.67 Mower blades are sharp. Wrap the blade or wear gloves before servicing them.
2.68 Check parking brake operation frequently. Adjust and service as required.
2.69 Maintain or replace safety and instruction labels, as necessary.
2.70 Do not attempt to mount a tire without the proper equipment and experience to perform the job.
or deform the wheel.
2.73 Mower deck, frame, and engine compartment should remain free of debris to prevent premature parts failures
or fire hazards.

SECTION 3: MOWER OPERATION
Never operate the machine with faulty equipment. Always be alert of sudden changes in landscape, as
the mower will react differently on slopes or embankments than it will on flat surfaces. Never operate
the mower with the discharge chute open. Do not cross terrain, other than grass, with blades turning.
This could cause damage to property or bystanders.
3.1 Place parking brake in up position
3.2 Drive arms must be in the “open” position. While sitting on the machine, each arm is
positioned away from the operator, to the right and left. Drive arms will lock into place and
must be in this position to start machine.
3.3 Put PTO switch in the OFF position.
3.4 If your machine has been equipped with a ROPS (Roll Over Protection System) then you
must fasten seatbelt.
3.5 If machine has not been started recently, engage the choke.
3.6 Make sure nothing is under or around machine.
3.7 Place key in ignition and turn.
3.8 Once machine is started, disengage the choke.
3.9 Increase RPM by sliding the throttle to fast position, toward the rabbit.
3.10 Owners must become familiar with the controls before operating a zero-turn radius vehicle.
3.11 Start slowly and build your skill level. Have ample practice before using the machine at full
capabilities.
3.12 Be comfortable with machine before engaging blades. Know what each component controls
before using machine.
3.13 Your mower will perform differently on an incline /decline. Be cautious, slow down, and do
not make any sudden jerking movements with control arms. The machine could lose traction
on a decline or tip backwards on an incline.
3.14 Once you become comfortable with your Bad Boy Mower you will notice your overall mowing
time will decrease.
Avoid operating your mower on side hills of over 5 degrees,
inclines of over 10 degrees,
and declines of over 15 degrees.
PAGE 9

SECTION 4: MOWER MAINTENANCE
SECTION 5: MOWER STORAGE & TRANSPORTATION
5.1 Keep machine from collecting debris by storing in a covered area while not in use.
5.2 Fuel can harm your machine if left for more than 30 days without changing, especially if the
fuel contains ethanol. Never use fuel with more than 10% ethanol by volume. E-15 is not
permitted.
5.3 Disconnect the negative battery cable when machine will be stored for more than 30 days.
5.4 Always secure machine properly when transporting machine.
5.5 Do not load machine on trailer with blades engaged.
5.6 Do not use ramps to load the machine.
5.7 Make sure Parking Brake is in “up” position.
5.8 In wet conditions tires may spin while loading / unloading. If necessary, wait for dry
conditions before loading / unloading.
5.9 Make sure mode of transportation is suitable to bear the weight of mower.
5.10 Deck height should be set at maximum before attempting to load.
5.11 Secure mower with at least two straps capable of securing weight of mower.
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MAINTENANCE LOG
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SECTION 6:TROUBLESHOOTING
6.1 Q: How do I prevent an uneven cutting pattern and increase the quality of cut?
6.1 A: Check tire pressure, check blade sharpness (replace blades or sharpen at least once
per year or when needed), make sure blades are tightened properly, check spring and belt
tension, check the underside of the deck to ensure the mower deck is free of grass build-up
and debris, make sure your machine is at full throttle, and vary your mowing pattern each
time you cut your grass.
6.2 Q: What should I do if my mower won’t start?
6.2 A: Check battery charge and connection (grounds), check your fuel (make sure fuel is less
than 30 days old and contains no water), make sure your spark plug is in good condition
and spark plug wire is attached, and make sure air filter is clean (a dirty filter makes it more
difficult for the engine to draw air). Check the integrity of the 25 amp main fuse; also check
for any bare wires and/or bad connections.
6.3 Q: What should I do if the blades won’t engage?
6.3 A: Make sure the safety switch is plugged in on the bottom of seat. Check the underside
of the PTO engager to ensure the plug is secure at switch. Also check PTO fuse underneath
operator console (10amps)
6.4 Q: What type of fuel is recommended for my mower?
6.4 A: We recommend that you use a name brand fuel to ensure quality. Use fuel with an
octane rating near 87. Higher octane fuels offer no benefit. Only fuels with an ethanol content
of 10% or less may be used. By law, E-15 fuel is not permitted. Usage of E-15 will result in
premature engine failure.
6.5 Q: Do you offer touch-up paint for your mowers?
6.5 A: Touch-up paint is available. Contact your local dealer for more information.
6.6 Q:
How do I clean my mower?
6.6 A: It is recommended that you use an air hose or blower to remove dust and debris from the
mower, to ensure there is not a build up of grass on the mower deck and engine
compartment, which could become a fire hazard. If you must wash the mower,
ensure you run the engine to operating temp to dry water and engage the blades to
spin off any standing water on the pulleys. Avoid spraying water onto electrical
components and bearings, to prevent premature failure of these parts.

PAGE 13
SECTION 7: CONTROLS
7.1 Ignition Switch—Bad Boy mowers have a three position ignition switch: off, run, and start.
With key inserted, rotate it clockwise to START position and release key when engine
starts, and switch will automatically return to the RUN position.
7.2Throttle Control—A cable is connected to the engine throttle for controlling engine speed.
Move lever forward to increase engine rpm, move lever backward to decrease engine rpm.
7.3 Choke Control—(Not Shown) The choke control, located to the right of the operator’s left,
is a ‘push-pull’ type. When the choke knob is pushed in, the choke is in the off (run)
position. When the choke is pulled out it is in the on (start) position. Do not operate
the machine in the on (start) position.
7.4Control Levers—These levers control the mower’s speed, direction, and neutral lock.
These levers are used to steer, accelerate, decelerate and change direction.
7.5 Blade Engage Switch—This switch engages the blades. Pull the switch up to engage the
blades and push the switch down to disengage the blades.
7.6 Deck Height Control—The deck height dial is used to set the cut of the deck.
7.1
7.5 7.2 7.6 7.4

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SECTION 8:MOVING INOPERABLE MOWER
8.1 Do not tow machine. Use a winch to load on a trailer for transporting.
8.2MZ Models are equipped with two neutral engage/disengage arms, located at the rear of
the mower protruding from the frame and under the muffler. By pulling the arms out, the
mower can be put in a neutral position. Return the arms to the “forward position” for normal
operation.
Your Bad Boy Mower Weighs: MZ MAGNUM SERIES: 585—602 lbs
*** Weights fluctuate with the addition of accessories.
8.3As you can see by the weights of the machines, you shouldn’t ever try to push or pull a Bad
Boy Mower by hand. This could cause serious bodily injury.
8.5Hopefully, you’ll never need to use this section of the manual. However, if you do, use
extreme caution when moving machine!
SECTION 9:INSTRUMENTATION
9 .1 Electronic HourMeter—Registers Hour increments up to 9,999.9 total hours. This meter
records the cumulative time the engine is running. (This is an option only for the MZ Series.)

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SECTION 10: MOWER BLADE MAINTENANCE
10.1 Check mower blades after each use. This is essential for maintaining well-groomed turf. Keep
the blades sharp. If a dull blade is used for cutting, the grass will tear rather than cut. This
could damage the grass leaving a brown frayed top on the grass within a few hours. A dull
blade will also require more power from the engine.
10.2 NEVER attempt to straighten a bent blade by heating. NEVER attempt to weld a cracked
blade. The blades can break and cause serious injury or death.
10.3 NEVER work with blades while engine is running or deck clutch is engaged.
10.4 ALWAYS place deck clutch in DISENGAGE position while performing maintenance.
10.5 Use blocks when you MUST work under mower.
10.6 ALWAYS wear thick gloves when handling blades.
10.7 ALWAYS check for blade damage if mower strikes rocks , branches , or other objects that
could potentially damage the blade.
(REMEMBER: NEVER CHECK BLADE WHILE ENGINE IS ON!
NEVER CHECK BLADES WHILE BLADES ARE ENGAGED!)
SECTION 11: EQUIPMENT LUBRICATION
11.1 Park the machine on a level surface and disengage the blade control switch.
11.2 Move the motion control levers outward to the neutral position, engage parking brake, stop
the engine, remove the key, and wait for all moving parts to stop before leaving the operating
position.
11.3 Grease Type: NLGI grade #2 multi-purpose gun grease.
11.4 Clean the grease fittings with a cloth. Scrape any paint off the front of the fitting(s).
11.5 Connect a grease gun to each fitting. Pump grease into the fitting until grease seepage is
observed. Be mindful of over-pressurization. do not force the lever arm if there is strong back
pressure as this can lead to reduced life of the component(s).
11.6 Refer to service manual section for grease fitting locations.

PAGE 16
HOW TO CHOOSE THE RIGHT BLADE
Essentially there are only TWO basic styles of mowing blades used or approved for use on our current
products:
1) The standard style of mowing blade is essentially designed for cutting grass and effectively discharging
the clippings out from the deck to fall onto the lawn or to be captured in a grass collection system.
Standard blades are also referred to as “2-in-1” (discharging & bagging ) or “high-lift” blades (because
they are designed to create a higher-lifting airflow).
2) Mulching blades generally have a more curved style surface and frequently include extra cutting
surfaces along the blade edges. These blades may also come in a “+” design (which is actually two
individual blades arranged in a perpendicular fashion to enhance mulching). The “+” blades are usually
found on older style mowers; newer ones utilize blades with more advanced mulching technology.
Mulching blades may also be referred to as “3-in-1” (mulching, discharging & bagging) or “all-purpose”
blades.
Bear in mind that the re-circulating airflow design of 3/1 blades makes them less efficient at discharging
grass clippings than a standard 2/1 blade. As with most all-purpose tools, there is some give and take as
opposed to using a tool designed for a more specific purpose.
If you’re experiencing less-than-desired cutting or discharging performance with a 3/1 blade, you may want
to check into using a 2/1 blade. Conversely, if you’re using a 2/1 blade and want to mulch clippings, you
should see about the availability of mulching blades or a mulching kit.*
The type of blade installed on a new mower is a decision the retailer makes for each model of mower, based
on the expected needs of most customers. If you’re unsure of which blade is on a particular model, inspect
the blade. Blades have part numbers stamped into them. Then compare these part numbers with the unit’s
Operator’s Manual or Parts List.
It is true there are many other styles of blades available. But since we don’t manufacture or recommend
using these other aftermarket styles, we will leave them out of this discussion. Should you want more
information on special application or aftermarket blades, you should contact the companies that make these
products. NOTE: Customers using non-OEM blades do so at their own risk. The use of unapproved (non-
OEM) blades may void any or all of the mower and engine factory warranties.
* MULCHING KITS – These generally consist of mulching blades and a mulching plug (which closes off
the discharge opening to keep the clippings contained under the deck for re-cutting) plus any necessary
hardware for installation. Please check with your parts distributor regarding the contents of a particular
mulching kit.

PAGE 17
MOWING TIPS:
• Mow header strips at the ends of the lawn and around flower beds first. Make them wide enough that you can turn the mower
around in the already mown section. Then mow back and forth between these header strips overlapping each lap by about 1/8 the
width of the mower’s deck.
• Don’t cut your grass too short, particularly cool season grasses. Higher heights usually provide for a deeper root system, looks
better, and is less likely to have weeds invading, particularly crabgrass.
• Don’t remove any more than one third of the grass leaf at any one cutting. If circumstances arise that a lawn gets too tall and you
just have to lop off a bunch to get caught up, bite the bullet and break it down into several mowings to get caught up with 3 or so
days between cuttings.
•NEVER SCALP YOUR LAWN. Scalping severely damages the root system to such a degree that it may die.
• Avoid mowing when the grass is wet or when it’s dark
• Avoid throwing grass clippings into the street and driveway where they can be washed into the sewer system. After mowing, clean
up driveway and walkways.
• When mowing remove only a third with each cutting (except for the first mowing of the season when it’s ok to remove more). You
can safely leave clippings that will quickly decompose and add nutrients back into the soil. Contrary to popular opinion, grass
clippings do not add to thatch buildup. Grass blades are made up of about 75% water.
• Mow your lawn in a different direction with each mowing, especially with lawns of shorter grass types. Altering the direction
ensures a more even cut since grass blades will grow more erect and less likely to develop into a set pattern.
• Keep your mower’s blade sharp, which means having it sharpened several times during the mowing season. Keep several blades
around so you’ll always have a sharp one on hand. Sharp blades cut the grass cleanly and help mulch clippings into small pieces
which break down quickly.
• Don’t forget to change your mower’s oil at least once during the mowing season. For brand new mowers, change the oil after
about 5 hours of operation during the initial break-in period.
• At the end of the mowing season use a fuel stabilizer in the remaining gasoline
• In the spring, don’t use that old gas unless you properly used a fuel stabilizer, it can cause a number of problems. Better to use
fresh gasoline to begin the new mowing season.
•Leaf blade A demonstrates what a leaf blade should look like
after mowing with a sharp blade.
•Leaf blade B demonstrates a leaf blade that was injured by a
dull mower blade.
•Leaf blade C was cut by the mower but indicates that the
mower blade is not sharp enough. The shredded white tissue
protruding from the leaf blades C and D is the vascular tissue
of the plant.
•Leaf blade D has been mown for quite some time with a dull mower blade.
To bag or mulch?
Grass clippings do not contribute to thatch buildup or increase the chances of disease. If you mow your lawn at the right height,
without removing any more than 1/3 of it’s total height, clippings will quickly breakdown without a trace. These clippings
contribute additional nitrogen and other nutrients to the soil and supply it with additional organic materials. Clippings from a
1000 sq. ft. lawn can add as much as 1 - 2 pounds of nitrogen back into the soil.
If you have a compost pile, then you may want to bag your clippings occasionally to add much needed green-matter to the
compost pile. Make sure it is mixed thoroughly with brown matter to avoid a strong ammonia odor. DO NOT COMPOST
CLIPPINGS after applying any weed control or weed-feed type product. Before adding clippings to the compost pile wait at
least 3 mowings after these products have been applied.

SERVICE SECTION
SECTION 1: HYDROSTATIC SYSTEM
The hydrostatic system on MZ models is a sealed lifetime
transaxle system, so no maintenance is required.
Under the rear of the mower, you will find the two levers shown in
the image. These bypass levers serve as a neutral for moving the
mower while the engine is not running. Pull the levers out and
lock them into place to activate the bypass.
When adjusting the tracking on the mower, the length of the
pushrods can be changed by screwing the swivel joint in or out
on the ends of the rods. Shortening the overall length of the rod
slows the pump down. Lengthening the rod will increase the
speed of the pump.
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PAGE 19
SECTION 2: DRIVE BELT
Shown to the right is the MZ pump belt tensioner.
Tightening the two 3/4" jam nuts on the right side will
increase the belt tension.
The tension should be adjusted so that there is between
60 to 65 lbs. of tension on the belt. This can be checked
with a belt tension gauge as shown to the right.

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KOHLER
This machine has an oil drain hose installed on
the engine to allow for easier oil changes. Bad
Boy recommends that the oil and filter be
changed after the initial 8 hrs of use, and at
intervals of 50 usage hours or yearly, whichever
occurs first after that. The oil capacity is 2 quarts.
Bad Boy 10W-30 synthetic blend engine oil is
recommended for maximum protection.
3.1 Changing your engine oil and oil filter
1) Remove oil dipstick and open oil
drain. Allow oil to completely drain.
(Make sure to have an oil pan ready to
capture old oil and properly dispose
old oil.)
2) Clean area around oil filter. Place a
container under the oil filter to capture
any oil and remove filter. Wipe off
mounting surface and reinstall drain
plug. Torque to 10 ft-lb.
3) Place new filter in shallow pan with
open end up. Fill with new oil until oil
reaches the bottom of the threads.
Allow 2 minutes for oil to be absorbed
by filter material.
4) Apply a thin film of clean oil to rubber
gasket on new filter
5) Refer to instructions on oil filter for
proper installation.
Oil Dipstick
Oil Filter
Fuel Filter
Oil Drain
Spark Plugs
Air Filter