Throttle & Choke Control Installation & …

1 1 Throttle & Choke ControlInstallation &Adjustment GuideContentsPage 2-3 Magnum Twin Horizontal Shaft .. 4-7 Magnum Twin Vertical Shaft .. 8-10 Command Single 11-15 Command Twin Cylinder .. 16-19 OHC Twin Cylinder .. 20-232 Safety PrecautionsElectrical Shock!Never touch electrical wires orcomponents while the engine isrunning. They can be sources ofelectrical Starts!Disabling engine. Accidentalstarting can cause severe injuryor death. Before working on theengine or equipment, disable theengine as follows: 1) Disconnectthe spark plug lead(s). 2) Removebattery cables (remove negative (-)lead first). Reconnect negative (-)lead last when reconnecting Exhaust Gases!Engine exhaust gases containpoisonous carbon monoxide is odorless,colorless, and can cause death ifinhaled. Avoid inhaling exhaustfumes, and never run the engine ina closed building or confined Gas!Batteries produce explosivehydrogen gas while being prevent a fire or explosion,charge batteries only in wellventilated areas.

2 Keep sparks, openflames, and other sources ofignition away from the battery at alltimes. Keep batteries out of thereach of children. Remove alljewelry when servicing disconnecting the negative( ) ground cable, make sure allswitches are OFF. If ON, a sparkwill occur at the ground cableterminal which could cause anexplosion if hydrogen gas orgasoline vapors are Shock can cause not touch wires while engine Monoxide can causesevere nausea, fainting or not operate engine in closed orconfined Starts can causesevere injury or and ground spark pluglead before Gas can cause fires andsevere acid battery only in a wellventilated area. Keep sources ofignition insure safe operations please read the following statements and understand their meaning. Also refer to yourequipment owner's manual for other important safety information. This manual contains safety precautionswhich are explained below. Please read is used to indicate the presence of a hazard that can cause severe personal injury, death, or substantialproperty damage if the warning is is used to indicate the presence of a hazard that will or can cause minor personal injury or propertydamage if the warning is is used to notify people of Installation , operation, or maintenance information that is important but Your Safety!

3 These precautions should be followed at all times. Failure to follow these precautions could result in injury toyourself and Fuel!Gasoline is extremely flammableand its vapors can explode ifignited. Store gasoline only inapproved containers, in wellventilated, unoccupied buildings,away from sparks or flames. Do notfill the fuel tank while the engine ishot or running, since spilled fuelcould ignite if it comes in contactwith hot parts or sparks fromignition. Do not start the enginenear spilled fuel. Never usegasoline as a cleaning Parts!Keep hands, feet, hair, and clothingaway from all moving parts toprevent injury. Never operate theengine with covers, shrouds, orguards Parts!Engine components can getextremely hot from operation. Toprevent severe burns, do not touchthese areas while the engine isrunning or immediately after it isturned off. Never operate theengine with heat shields or Parts can cause severe not touch engine while operatingor just after Fuel can cause fires andsevere engine before filling fuel Parts can cause away while engine is Precautions4 Magnum Twin HorizontalMagnum Twin Cylinder Horizontal Shaft EnginesHow to Install Dual Controls And Make AdjustmentsPage Throttle Control .

4 5-6B. Choke 6C. Starting the Engine .. 6D. Changing the High Idle RPM .. 71. Increase2. DecreaseE. Changing a Constant RPM Control .. 7F. Setting the Low Idle RPM .. 7G. Carburetor Fuel Mixture .. 7H. Shutting the Engine Down .. 7 Tools Needed1/4" wrench, or nut driver3/8" - 7/16" wrench, or ratchet and socketBlade type screwdriverTorque wrench is requiredTachometer5 Magnum Twin HorizontalFigure 1. Magnum Twin Horizontal Throttle Throttle Control (Does not apply to customersupplied Control plate.) with the square air cleanerassembly-Remove the two wing nuts (top ofair cleaner cover), the cover, and the tworubber seals, and then lift the element and the breather hose from the aircleaner base by pushing the air cleaner base 3/8" hex. screw, air cleaner base, and ovalair the air cleaner base gasket on thecarburetor air cleaner with dome style air cleaner startwith # Loosen the Throttle Control cable clamp locatedon top of the intake manifold, or on the intakemanifold bracket, located to the right on one ofthe manifold mounting Position the application Throttle Control in thefastthrottle position.

5 Then move the throttlecontrol back 3/16" ( mm). Insert the controlcable bowden wire in the proper hole of theengine Control lever, which is located onthe side of the carburetor air intake Throttle Control Lever(Shown in Low Idle Position) Throttle Cable(Under CableClamp)Constant Speed Control (When RemoteCable is Not Used)Optional Throttle CableBracket LocationHigh Idle RPMStop Bracket ScrewHigh Idle RPMStop BracketGovernorSpringThrottle Control Wire6 Magnum Twin Horizontal5. Grasp the Control cable and place it under thecable clamp. Pull until the cable is taut, thentighten the clamp screw. NOTE: The enginecontrol lever should be against the high idleRPM stop Move the application Throttle Control to theslow position, then to fast. Check the enginecontrol to assure it stops against the high idleRPM stop :When the application Throttle controllever is in the slow position theengine governor spring must be freeof tension or pushing pressure. A non-free spring can affect the : Do not move the governor spring toother holes without Choke Control (See Figure 2)1.

6 Loosen the cable clamp screw on the bottomfront side of the intake manifold for a forwardpull Choke , or on the air intake elbow for areverse Place the Choke Control cable under the intakemanifold from the front of engine (front pullchoke). Insert the cable bowden wire into thechoke Control (front or reverse pull). Thenplace Choke cable under the cable Position the Choke Control so it bottoms,then pull it back approximately 1/16" ( mm).Make sure that the carburetor Choke is fullyopened before tightening cable Reassemble all air cleaner components andthe crankcase breather Starting the Engine1. Position the application Throttle Control tomid/full Place the Choke Control into the Turn the key switch or push the start as soon as the engine Push the Choke Control inward. If the enginehesitates, pull the Choke Control out until theengine regains its momentum, then push thechoke Control in again. Repeat as Set the Throttle Control to the desired 2.

7 Magnum Twin Horizontal Choke Pull Choke ControlAir IntakeElbowChoke Control Lever(Shown In Open Position)Front PullChoke Control7D. Changing the High Idle RPMTo Increase the High Idle RPM1. With the engine running, loosen the throttlecable clamp screw enough to slide the Loosen the engine high idle stop bracket screw1/2 to 3/4 turn. (See Figure 1 on page 4.)3. Position the application Throttle Control to fastthen back it off approximately 3/16" ( mm).4. Pull the Throttle Control cable until the requiredRPM is obtained. (NOTE: Tap the high RPMstop bracket to the left if it does not movewhen the cable is pulled.) Tighten both highRPM stop screw and the cable clamp Move the application Throttle Control to slow,then to fast. Check the RPM with Decrease the High Idle RPMR efer to the above steps 1, 2, and Push the Throttle Control cable until therequired high idle RPM is Tighten the cable clamp Slide or tap the high idle stop to the right untilit is against the engine Control lever.

8 Torquethe high RPM stop bracket screw to 70 in. Move the application Throttle lever to slow,then to fast. Check the RPM with Changing the Constant RPM Control Engine1. With the engine running, loosen two nuts onthe RPM adjusting rod location on top of theintake manifold. The rod is connected to thegovernor spring (not shown on Figure 1).2. To increase the RPM: Hold the adjusting rodand turn one nut inward until the required RPMis Turn the second nut against the first two wrenches to lock the nutstogether. Check the To decrease the RPM: Turn the two nutsoutward until the required RPM is to Step 2a for a final Setting the Low Idle RPM1. The low idle RPM can be increased ordecreased by turning the low idle stop screw(located near the top of the carburetor andbelow the Throttle lever with the link attached)inward to increase, or outward to Carburetor Fuel Mixture(Fixed & adjustable jet carburetors)1. The fuel mixture should not require adjustmentunless the RPM has significantly changed andthe engine has been running for more than Shutting the Engine Down1.

9 Position the application Throttle lever in theslowposition when not required to run engineout of fuel. Allow the engine to come to Turn the key switch off, or push and hold thestop button until the engine When required to run the engine out of fuel,leave the Throttle Control in the fastpositionand run until the engine Turn the key switch A constant speed unit is normally controlledthrough a low idle pull-down device which isautomatically activated when the load isremoved. Before stopping remove load, letengine decelerate, then turn key or switch tooff Twin Horizontal8 Magnum Twin VerticalMagnum Twin Cylinder Vertical Shaft EnginesHow to Install Dual Controls and Make AdjustmentsPage Throttle Control .. 91. Right Side Pull2. Left Side PullB. Choke Control .. 9-10C. Starting the Engine .. 10D. Changing the High Idle RPM .. 10E. Setting the Low Idle 10F. Carburetor Fuel Mixture .. 10G. Shutting the Engine 10 Tools Needed1/4" wrench or nut driver5/6" - 3/8" wrench, ratchet and socket, or nut driverBlade type screwdriverTachometer9 Figure 1.

10 Magnum Twin Vertical Throttle and Choke Throttle Control1. Loosen the Throttle Control (right side or leftside pull cable clamp Position the application Throttle Control in thefastposition, then move the Throttle controlback 3/16" ( mm). Insert the Control cablebowden wire into the proper hole or swivelclamp in the engine Control lever which islocated on the left side of the intake manifoldfor a left side pull. For a right side pull, loosenthe Control cable clamp screw located on theright side of the intake Position the Control cable under the cableclamp and grasp the cable pull until it is tautthen tighten the cable clamp :The engine Throttle Control should beagainst the high idle adjusting Move the application Throttle Control to theslowposition then to the fastposition. Checkthe engine Control lever to assure it stopsagainst the high idle adjusting Choke Control (See Figure 1)1. Loosen the Choke Control cable clamp screwon the air cleaner intake Insert the Choke cable bowden wire into thechoke lever on the carburetor, then place thecable under the cable Push the application Choke Control in untilit Grasp the cable near the cable clamp on theengine, push lightly until the application chokecontrol moves approximately 1/16" ( mm)from its bottomed position, hold the cable andtighten the clamp CableScrew and ClampThrottle CableScrew and ClampHigh Idle AdjustingScrew with Lock NutChoke CableScrew and ClampRight SideThrottle PullLeft SideThrottle PullThrottleControl LeverMagnum Twin Vertical105.)