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                        OWNER’s MAN UAL 
MODELS 
K91 
I 
(4 hP) 
Kl6l,&Kl81 
(8 hP) 
(7 hP) 
operating & maintenance 
instructions 
CONGRATULATIONS-You have selected a fine four-cycle engine. Kohler designs long-life 
strength and on-the-job durability into each engine...making a Kohler engine 
dependable...dependability you can count on. 
n Parts subject to the most wear and tear (like cylinders, crankshafts, and camshafts) are 
made from precision-formulated castiron...and because the cast iron cylinders can be 
rebo
                    
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                        Safety Information  For Your Safety!  These precautions should be followed at all times. Failure to.follow these precautions could result  in injury to yourself and others.  A WARNING A WARNING  A WARNING  #  r-  -v  db  u  Explosive Fuel can cause fires and Rotating Parts can cause severe  Hot Parts can cause severe burns.  severe burns. injury.  Do not touch engine while operating  Stop engine before filling fuel tank. Stay away while engine is in  or just after stopping.  operation.  Explosiv
                    
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                        FUEL RECOMMENDATIONS OIL RECOMMENDATIONS  Using the proper type and weight crankcase oil is  WARNING: Explosive Fuel1  e,  Gasoline is extremely flammable and its vapors can extremely important as is checking oil daily and  explode if ignited. Store gasoline only in approved changing oil and filter regularly. (See ‘Required  containers, in well-ventilated, unoccupied buildings, Maintenance” on page 7.) Failure to use the correct oil  away from sparks or flames. Do not fill the fuel tank or using
                    
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                        F  I -lM  ...........  .........  ..........  .........  ..........  .........  ..........  .........  ..........  .........  ..........  .........  ..........  .........  ..........  .........  ..........  ’ t .........  ..........  .........  ..........  .........  ..........  . ...................  Operating .;;;:::..:.:.  .........  ..........  .........  ..........  .........  .......... .........  ..........  .........  ..........  Range .........  .......... .........  ..........  .......
                    
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                        OPERATING INSTRUCTIONS  ALSO READ THE OPERATING INSTRUCTIONS OF THE EQUIPMENT  THIS ENGINE POWERS  For A Retractable Start Engine - SLOWLY pull the  PRE-START CHECKLIST  starter handle until just past compression - STOP!  Return starter handle, pull firmly with a smooth, steady  cl Check oil level. Add oil if low.  motion to start. Pull the handle straight out to avoid  excessive rope wear from the starter rope guide.  cl Check fuel level. Add fuel if low.  Extend the starting rope periodically 
                    
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                        BAlTERY ’  and  NOTE: If debris builds up on air intake screen  other intake areas, STOP the engine  L  A 12 volt battery is normally used. Refer to the intake  immediately and clean. Obstructed air  operating instructions of the equipment this engine  areas cause engine damage due to  powers for specific information.  overheating.  If the battery charge is not sufficient to turn over the  A WARNING: Hot Parts!  engine, recharge the battery (see page 13).  Engine components can get extremely hot
                    
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                        MAINTENANCE INSTRUCTIONS  WARNING: Accidental Starts!  A  Before servicing the engine or equipment, always disconnect the spark plug lead to prevent the engine from  starting accidentally. Ground the spark plug lead to prevent sparks that could cause fires. Make sure the  equipment is in neutral.  These service procedures should also be performed as part of any seasonal tune-up.  Maintenance Rewired Frecwencv  CleanAirlntakeScreen’ ................................................................
                    
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                        Precleaner  Air Filter  Plate  Wing  Nut  3 . Check gap (0.025”) using a wire feeler gauge.  SPARK PLUGS  Adjust the gap as necessary by carefully  bending the ground electrode. Install the plug  Every 100 hours of operation remove the spark plug,  and torque to 18-22 ft. lb.  check condition and reset the gap, or replace with a  new plug as necessary.  1 . Before removing the spark plug, clean the area  Wire  around the base of the plug to keep dirt and  debris out of the engine.  2 . Remove th
                    
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                        CARBU.RETOR TRdUBLESHOOTlNG AND ADJUSTMENTS  Carburetor adjustments should be made on/y after engine has warmed up.  Kohler K91, K161 and K181 engines are equipped  Kohler Carburetor Adjustment  with one of two basic types of carburetors - Kohler or  Walbro - fixed main jet or adjustable main jet.  1 . With the engine stopped, turn the fuel adjusting  needles In (clockwise) until they bottom lightly.  The carburetor is designed to deliver the correct fuel-  to-air mixture to the engine under all
                    
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                        5 . Low Idle Fuel Needle Setting: Place the throttle  Walbro Carburetor Adjustment  into the Tdlem or %low’ position.  3  .Idle SDeed Screw  Turn the low idle fuel adjusting needle out  (counterclockwise) from the preliminary setting  until the engine speed decreases (rich). Note the  position of the needle.  Now turn the adjusting needle In (clockwise). The  engine speed may increase, then it will decrease  as the needle is turned in (lean). Note the  position of the needle.  \  Main Fuel Needl
                    
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                        .  3 Start the engine and run at hatf throttle for five to  Back out  ten minutes to warm up. The engine must be  Appx. 118  warm before making final settings.  to 114  turn.  Lean Lean  4 . Main Fuel Needle Setting: This adjustment is  I  I  required only for adjustable main jet carburetors.  \  I  I  \  If the carburetor is a fixed main jet type, disregard  I  I  CI  this setting.  I  \I {  --- v  Place the throttle into the Vast” position.  Turn the adjusting needle In (clockwise). The @ c3  
                    
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                        Dirt Dirty Inconed Engine Dirty  F=m  No Im In Air oil over- Fitter spark  TROUBLESHOOTING Fuel P= ueI FueILineScreen IAM Loaded  Element mug  When a problem occurs, do not Will not start X X X X X X  overlook the simple causes. For Hard starting X X X X X X  example, starting problems could be  Stops suddenly X X X X X X  caused by an empty fuel tank. The  Lacks power X X X X X X X  table lists some common causes of  Operates  troubles.  erratically X X X X X X  Knock& or pings X X X X  Do not 
                    
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                        A/ways insist on genuine Kohler pans. All genuine  Kohler parts meet strict standards for fit, reliability,  MODEL DESIGNATION  and performance.  The Model number designates the cubic inch  STORAGE  displacement and the number of cylinders--Model  K181S; for example: designates 18 cubic inch  displacement, 1 designates single cylinder. The If the engine is to be out of service for approximately  two months or more, use the following storage  letter suffii designates a specific version as follows
                    
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                        SPECIFICATIONS  K91  Power Rating at4000 RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...? . . . . . . . . . . . . . . . . . . . . . ..4hp  8.9 in3 (145 cm3)  Displacement . . ,..,..............,,.,,....................................  2.375 in (60.33 mm)  Bore . . . . . . . . . . . . . . . . . . . . . . . . ..l.............................~ . . . . . . . .  2.000 in (50.80 mm)  Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
                    
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                        LIMITED 1 YEAR ENGINE WARRANTY  We warrant to the original consumer that each new engine sold by us will be free from manufacturing defects in materials or  workmanship in normal service for a period of one (1) year from date of purchase, provided it is operated and maintained in  accordance with Kohler Co.% instructions and manuals.  Our obligation under this warranty is expressly limited, at our option, to the replacement or repair at Kohler Co., Kohler, Wisconsin,  53044, or at a service faci