BBM MZ SERIES ZERO-TURN MOWER. Manual - part 6

PAGE

 

22

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

PAGE 

23

6) Fill crankcase with approximately 2

quarts of new oil. Level should 

reach

top of indicator on dipstick.

7) Reinstall oil filter dipstick and tighten

securely.

8) Start engine; check for oil leaks. Stop

Engine; correct oil leaks. Recheck oil
level.

9) Dispose of used oil and filter in

accordance with local ordinances.

The fuel filter is located in the fuel line about 12" from the 
carburetor on the side of the engine. Replace the filter yearly. 
Prior to the removal of the old filter, note the direction of fuel 
flow as indicated on the filter. Have towels readily available 

i

n 

order to quickly remove any fuel leakage. Always use new hose 
clamps and ensure the security of the new filter by lightly pulling 
on each hose. Always p

er

form maintenance outdoors or in a well 

ventilated area. Do not smoke or allow any open flames in the 
vicinity of any maintenance activities.

PAGE 

 

 24

The air cleaner is the engine’s only defense against damaging foreign particles. It is very important that the air cleaner 
element is inspected prior to each use. Remove the element and tap its sides in order to remove debris. Do not blow the 
filter out using compressed air. Doing so will greatly reduce the air cleaner’s effectiveness. Replace yearly; more often in 
dusty environments. Adhering to these practices will help prevent loss of power and  premature engine failure.

 

3.2 Changing your fuel filter:

1)

Locate your fuel filter and mark the direction it is

facing.

2)

Clamp each side of the fuel filter to minimize any gas

spills.

3)

Remove the clips from each side of the fuel filter and

remove the fuel filter.

4)

Place the new fuel filter in the same direction as the old

and place clips back into place and remove clamps.

PAGE

  

25

1) U

nlock the air cleaner cover and remove to access

the air cleaner.

2) R

emove the paper element and precleaner.

3) R

eplace or wash precleaner in warm water

with detergent. Rinse and allow to air dry.

4) L

ightly oil precleaner with new engine oil; squeeze

out excess oil.

5) R

eplace paper element and place precleaner onto

new paper element.

6) I

nstall onto base and place cover back on and lock

into place.

3.4 Changing the spark plugs and checking the spark 

 plug gap: 

3.3 Changing the air cleaner: 

1)

In order to access the spark plugs you will need to
remove the rear engine cover. This can be
accomplished by removing the four carriage bolts
using a 7/16” ratcheting wrench.

2) R

emove the wire on the spark plug and use a 5/8”

socket to remove the spark plug.

3) Check the gap on the spark plug to verify that it is

0.03 in using a feeler gauge.

4) I

f the spark plug is worn, overheated, wet or carbon

fouled replace the spark plug.

5) Install the plug into Cylinder head and torque to 20

ft*lbs. Be careful not to overtighten the spark plug.