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9

SECTION 4: OPERATING YOUR CULTIVATOR

Oil and Gas Mixing Instructions

Old and/or improperly mixed fuel are the main 
reasons for the unit not running properly. Be sure to
use fresh, clean unleaded fuel. Follow the instructions
carefully for the proper fuel/oil mixture.

Definition of Blended Fuels

Today's fuels are often a blend of gasoline and 
oxygenates such as ethanol, methanol or MTBE
(ether). Alcohol-blended fuel absorbs water. As little
as 1% water in the fuel can make fuel and oil sepa-
rate. It forms acids when stored. When using alcohol-
blended fuel, use fresh fuel (less than 60 days old).

Using Blended Fuels

If you choose to use a blended fuel, or its use is
unavoidable, follow recommended precautions.

Always use fresh fuel mix per your operator's
manual.

Use the fuel additive STA-BIL® or an equivalent.

Always agitate the fuel mix before fueling the unit.

Drain the tank and run the engine dry before 
storing the unit.

Using Fuel Additives

The use of fuel additive, such as STA-BIL® Gas
Stabilizer or an equivalent, will inhibit corrosion and
minimize the formation of gum deposits. Using a fuel
additive can keep fuel from forming harmful deposits
in the carburetor for up to six (6) months. Add 0.8 oz.
(23 ml.) of fuel additive per gallon of fuel according to
the instructions on the container. NEVER add fuel
additives directly to the unit's fuel tank. 

CAUTION: For proper engine operation
and maximum reliability, pay strict 
attention to the oil and fuel mixing
instructions on the 2-cycle oil container.
Using improperly mixed fuel can 
severely damage the engine.

Thoroughly mix the proper ratio of 2-cycle engine oil
with unleaded gasoline in a separate fuel can. Use a
32:1 fuel/oil ratio. Do not mix them directly in the
engine fuel tank. See Figure 15 for specific gas and
oil mixing ratios.

NOTE: Two gallons (7.6 liters) of unleaded gasoline
mixed with one 8 oz. (236 ml.) bottle of Arnold 2 Cycle
Oil makes a 32:1 fuel/oil ratio OR one gallon (3.8 liters)
of unleaded gasoline mixed with one 4 oz. (120 ml.)
bottle of Arnold 2 Cycle Oil makes a 32:1 fuel/oil ratio.

WARNING: Gasoline is extremely 
flammable. Ignited Vapors may explode.
Always stop the engine and allow it to
cool before filling the fuel tank. Do not
smoke while filling the tank. Keep sparks
and open flames at a distance from the
area.

WARNING: Remove fuel cap slowly to
avoid injury from fuel spray. Never 
operate the unit without the fuel cap
securely in place.

WARNING: Add fuel in a clean, well 
ventilated area outdoors. Wipe up any
spilled fuel immediately. Avoid creating 
a source of ignition for spilt fuel. Do 
not start the engine until fuel vapors 
dissipate.

NOTE: Dispose of the old fuel/oil mix in accordance
to Federal, State, and Local regulations.

Filling The Fuel Tank

Fill or add fuel to the tank only when the cultivator is
in a horizontal position. See figure 16.

+

OR

UNLEADED GAS

ARNOLD 2 CYCLE OIL

2 US. GALLONS      

+

8.0 FL. OZ.

(7.6 LITERS)                   (236 ml)

1 US. GALLON      

+

4.0 FL. OZ.

(3.8 LITERS)                   (120 ml)

MIXING RATIO - 32:1

Figure 15

Figure 16

Summary of Contents for 21A-120R000

Page 1: ...r state laws if any If a spark arrester is used it should be maintained in effective working order by the operator In the State of California the above is required by law Section 4442 of the Californi...

Page 2: ...nt or an authorized dealer You can locate the model number by standing in the operating position behind the unit and looking on the left side of the engine next to the On Off Stop Control Switch A sam...

Page 3: ...nside a closed room or building Breathing exhaust fumes can kill Operate this unit only in a well ventilated area outdoors Wear safety glasses or goggles that are marked as meeting ANSI Z87 1 standard...

Page 4: ...ard replace faulty muffler and spark arrestor keep the engine and muffler free from grass leaves excessive grease or carbon build up Never store the unit with fuel in the tank inside a building where...

Page 5: ...IVATOR SETTING UP YOUR CULTIVATOR Installing The Wheel Bracket Assembly WARNING To avoid injury from the tines wear heavy gloves and a long sleeve shirt when installing the wheel bracket assembly 1 Wi...

Page 6: ...ion the two 2 handlebar clamps with one on each side near the top of the handlebar Swing the handlebar up until it sets to the outside of the two mounting brackets on the engine See Figure 6 NOTE Posi...

Page 7: ...e of the trigger See Figure 11 4 Release the throttle trigger and guide the cable up into the slot of the trigger housing 5 Push the throttle cable housing into the trigger housing until it snaps into...

Page 8: ...ontrols the engine speed See Figure 14 On Off Stop Control The On Off Stop control switch is located on the left side mounting bracket It is used to turn the unit on and off The switch must be in the...

Page 9: ...maximum reliability pay strict attention to the oil and fuel mixing instructions on the 2 cycle oil container Using improperly mixed fuel can severely damage the engine Thoroughly mix the proper rati...

Page 10: ...as though it wants to run normally 2 to 5 pulls NOTE Squeeze the throttle control until the engine has started and warmed up 6 Place the choke lever in the PARTIAL choke position B See Figure 18 NOTE...

Page 11: ...grips firmly slowly lower the cultivator until the tines make contact with the ground See Figure 20 5 As cultivating action begins pull back on the cultivator so that the tines can penetrate the grou...

Page 12: ...TIVATOR in Section 6 Adjusting Idle Speed WARNING This unit will need to be running during idle speed adjustment Wear protective clothing and observe all safety instructions to prevent serious persona...

Page 13: ...iver 3 Pull the cover from the engine Do not force 4 Remove the air filter from behind the air filter muffler cover See Figure 24 4 Wash the filter in detergent and water Rinse the filter thoroughly S...

Page 14: ...the cylinder 4 Install a correctly gapped spark plug in the cylin der head Tighten by turning the 5 8 inch socket clockwise until snug If using a torque wrench torque to 110 120 in lb 12 3 13 5 N m Do...

Page 15: ...rized use or damage Store the unit in a dry well ventilated area Do not store next to corrosive materials such a fertilizer Store the unit out of the reach of children ENGINE WILL NOT START ENGINE WIL...

Page 16: ...41 1 2 3 8 10 12 3 4 5 7 6 11 15 16 50 51 14 13 20 52 22 17 18 19 21 37 38 39 40 42 41 32 33 26 27 28 30 41 34 36 35 30 25 44 29 43 49 45 46 47 48 24 31 23 9 SECTION 9 PARTS LIST FOR MODEL 21A 120R00...

Page 17: ...ainer Assembly 31 611061 Rope Guide 32 180317 Fuel Tank Guard Assembly 33 181079 Pull Handle 34 613103 Rope 35 181912 Housing Screw 36 182776 Starter Housing Assembly includes items 28 31 33 35 37 182...

Page 18: ...18 1 1 3 2 4 11 12 13 10 17 18 19 20 22 25 21 26 22 28 27 27 29 30 24 23 24 28 29 14 15 16 9 6 7 8 6 9 5 MODEL 21A 120R000...

Page 19: ...ndle Clamp 15 181815 Nut 16 145569 Anti Rotation Screw 17 181575 Grip 18 180943 Drive Shaft Housing Assembly 19 181577 Flexible Drive Shaft 20 181578 Retainer Sleeve includes 21 21 180288 Sleeve Retai...

Page 20: ...set forth below is given by MTD SOUTHWEST INC MTD with respect with new merchandise purchased and used in the United States its possessions and territories MTD warrants this product against defects in...

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