Kohler K91 User Manual

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OWNER’s

MAN UAL

MODELS

K91

I

(4 hP)

Kl6l,&Kl81

(7 hP)

(8 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

rebored, these engines can last even longer.

n Kohler engines are easy to service, all routine service parts--points, condenser, spark plug,

air filter, carburetor--are easily and quickly accessible.

0 Every Kohler engine is backed by a worldwide network of over 10,000 distributors and

dealers. Service support is just a phone call away. Call l-800-544-2444 (U.S. & Canada)

for Sales & Service Assistance.

To keep your engine in top operating condition, follow the simple maintenance procedures

given in this manual.

Other manuals for Kohler K91

Owner's Manual8 pages

Service Manual137 pages

Multi-Language Owner's Manual8 pages

Questions and Answers:

S
Shane GarciaJul 26, 2025
What to do if Kohler K91 cranks but will not start?
- S
  Steven HoodJul 26, 2025
  If your Kohler Engine cranks but won't start, it could be due to an empty fuel tank, a loose spark plug lead, loose wires intermittently shorting the ignition to ground, a closed fuel shutoff valve, a clogged fuel line, a disconnected spark plug lead, the keyswitch or kill switch being in the "off" position, an improperly adjusted carburetor, engine overheating, or incorrect valve-to-tappet clearance.
D
david63Jul 30, 2025
Why Kohler K91 will not crank?
- B
  blackburnjohnJul 31, 2025
  Your Kohler Engine may not crank because the hydrostatic transmission is not in neutral, the PTO drive is engaged, the engine is overheating, the spark plug is faulty, the carburetor is improperly adjusted, or there is low compression.
C
Caleb RosarioAug 3, 2025
Why Kohler K91 Engine starts but does not keep running?
- F
  floresjohnAug 4, 2025
  If your Kohler Engine starts but doesn't keep running, it could be due to an improperly set idle speed adjusting screw, dirt or water in the fuel system, an improperly set idle fuel adjusting screw, a restricted fuel tank vent, faulty choke or throttle controls/cables, loose wires shorting the ignition to ground, a faulty spark plug, incorrect valve-to-tappet clearance, or low compression.
S
Samuel BellAug 8, 2025
Why Kohler K91 Engine loses power?
- K
  kylie10Aug 8, 2025
  Your Kohler Engine may be losing power due to several reasons. These include a low or high crankcase oil level, a restricted air cleaner element, dirt or water in the fuel system, excessive engine load, a faulty ACR mechanism, a faulty spark plug, an improperly adjusted carburetor, incorrect valve-to-tappet clearance, or low compression.
K
kcainAug 12, 2025
What to do if Kohler K91 Engine overheats?
- M
  mkellyAug 12, 2025
  If your Kohler Engine is overheating, it might be caused by a clogged grass screen, cooling fins, or shrouding. It could also be due to excessive engine load, a faulty cylinder head gasket, or a faulty fuel pump.
S
Stephanie JohnsonAug 17, 2025
What to do if Kohler Engine knocks?
- B
  Blake SimonAug 17, 2025
  If your Kohler Engine is knocking, it could be due to a low crankcase oil level, excessive engine load, clogged or restricted fuel lines, or faulty choke or throttle controls/cables.
M
Miguel WeberAug 20, 2025
What to do if Kohler K91 runs but misses?
- J
  Jason SullivanAug 21, 2025
  If your Kohler Engine runs but misses, the possible causes may be dirt or water in the fuel system, a faulty keyswitch or ignition switch, a faulty electric starter/starter solenoid, a retractable starter not engaging in the drive cup, or seized internal engine components.

Kohler K91 Specifications

General

Fuel Type	Gasoline
Compression Ratio	6.5:1
Cooling System	Air-cooled
Engine Type	4-cycle, single cylinder
Power Output	4 HP
Starting System	Recoil

Summary

General Safety Information

Safety Precautions and Warnings

Essential safety guidelines for operating and maintaining the engine to prevent injury.

Fuel and Oil Recommendations

Fuel Recommendations

Guidance on selecting and using appropriate gasoline types and blends for Kohler engines.

Oil Recommendations

Advice on choosing the correct oil type and viscosity for optimal engine performance.

Engine Operation Procedures

Pre-Start Checklist

Essential checks to perform before starting the engine for safe operation.

Engine Starting Procedures

Step-by-step guide for starting rope, retractable, and electric start engines.

Maintenance Schedule and Identification

Maintenance Schedule Overview

A table outlining required maintenance tasks and their frequencies.

Carburetor Troubleshooting and Adjustment

Carburetor Troubleshooting

Kohler Carburetor Adjustment

Walbro Carburetor Adjustment

Walbro Carburetor Adjustment Procedure

Troubleshooting, Battery Charging, and Gear Units

General Troubleshooting Guide

Engine Model Specifications

Model K91 Specifications

Detailed technical specifications for the Kohler K91 engine model.

Model K161 Specifications

Detailed technical specifications for the Kohler K161 engine model.

Model K181 Specifications

Detailed technical specifications for the Kohler K181 engine model.

Warranty and Service Information

Limited 1 Year Engine Warranty

Sales and Service Contact Information

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