Kohler Confidant EFI EZT715 / EZT725 / EZT740 / EZT750 Manual

Safety Precautions

• Read all safety precautions and instructions carefully before operating equipment. Refer to operating instruction of equipment that this engine powers.
• Ensure engine is stopped and level before performing any maintenance or service.
• Warranty coverage as outlined in warranty card and on KohlerEngines.com. Please review carefully as it provides your specific rights and obligations.
• Kohler Engines has published CO2 values on KohlerEngines.com website.
• Record engine information to reference when ordering parts or obtaining warranty coverage.

A hazard that could result in death, serious injury, or substantial property damage.

A hazard that could result in minor personal injury or property damage.

NOTE: is used to notify people of important installation, operation, or maintenance information.

Explosive Fuel can cause fires and severe burns.
Do not fill fuel tank while engine is hot or running.

Gasoline is extremely flammable and its vapors can explode if ignited. Store gasoline only in approved containers, in well ventilated, unoccupied buildings, away from sparks or flames. Spilled fuel could ignite if it comes in contact with hot parts or sparks from ignition. Never use gasoline as a cleaning agent.

High Pressure Fluids can puncture skin and cause severe injury or death.
Do not work on fuel system without proper training or safety equipment.

Fluid puncture injuries are highly toxic and hazardous. If an injury occurs, seek immediate medical attention.

Accidental Starts can cause severe injury or death.
Disconnect and ground spark plug lead(s) before servicing.

Before working on engine or equipment, disable engine as follows:

1. Disconnect spark plug lead(s).
2. Disconnect negative (–) battery cable from battery.

Carbon Monoxide can cause severe nausea, fainting or death.
Avoid inhaling exhaust fumes. Never run engine indoors or in enclosed spaces.

Engine exhaust gases contain poisonous carbon monoxide. Carbon monoxide is odorless, colorless, and can cause death if inhaled.

Rotating Parts can cause severe injury.
Stay away while engine is in operation.

Keep hands, feet, hair, and clothing away from all moving parts to prevent injury. Never operate engine with covers, shrouds, or guards removed.

Hot Parts can cause severe burns.
Do not touch engine while operating or just after stopping.

Never operate engine with heat shields or guards removed.

Electrical Shock can cause injury.
Do not touch wires while engine is running

This product can expose you to chemicals including carbon monoxide and benzene, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Product Overview

1. Air Cleaner Cover
2. Debris Screen
3. Fuel Filter
4. Oil Filter
5. Oil Fill/Dipstick
6. Oil Drain Plug
7. Spark Plug
8. Bail
9. Paper Element
10. Precleaner
11. Air Cleaner Base
12. Low-Profi le Air Cleaner
13. Heavy-Duty Air Cleaner
14. Starter Handle
15. Retractable Starter

Visit KohlerEngines.com for service parts information and purchasing options.

Pre-Start Checklist

1. Check oil level. Add oil if low. Do not overfill.
2. Check fuel level. Add fuel if low. Check fuel system components and lines for leaks.
3. Check and clean cooling areas, air intake areas and external surfaces of engine (particularly after storage).
4. Check that air cleaner components and all shrouds, equipment covers, and guards are in place and securely fastened.
5. Check spark arrestor (if equipped).

Starting

Carbon Monoxide can cause severe nausea, fainting or death.
Avoid inhaling exhaust fumes. Never run engine indoors or in enclosed spaces.

Engine exhaust gases contain poisonous carbon monoxide. Carbon monoxide is odorless, colorless, and can cause death if inhaled.

Rotating Parts can cause severe injury.
Stay away while engine is in operation.

Keep hands, feet, hair, and clothing away from all moving parts to prevent injury. Never operate engine with covers, shrouds, or guards removed.

NOTE: To prime a dry fuel system, turn key switch to ON position for one minute. Allow fuel pump to cycle and prime system. Turn key switch OFF.

NOTE: Do not crank engine continuously for more than 10 seconds. Allow a 60 second cool down period between starting attempts. Failure to follow these guidelines can burn out starter motor.

NOTE: Extend starter cord periodically to check its condition. If cord is frayed have it replaced immediately by a Kohler authorized dealer.

NOTE: If using retractable start, slowly pull starter handle until just past compression-STOP! Return starter handle; firmly pull straight out to avoid excessive rope wear from starter rope guide.

Refer to operating instructions of equipment this engine powers for specific starting instructions.

Cold Weather Starting Hints

1. Use proper oil for temperature expected.
2. Disengage all possible external loads.
3. Use fresh winter grade fuel. Winter grade fuel has higher volatility to improve starting.

Stopping

1. If possible, remove load by disengaging all PTO driven attachments.
2. Position throttle control between half and full throttle; stop engine.

Angle of Operation

Refer to operating instructions of equipment this engine powers. Do not operate this engine exceeding maximum angle of operation; see specification table. Engine damage could result from insufficient lubrication.

Engine Speed

NOTE: Do not tamper with governor setting to increase maximum engine speed. Overspeed is hazardous and will void warranty.

Maintenance Instructions

Accidental Starts can cause severe injury or death. Disconnect and ground spark plug lead(s) before servicing.

Before working on engine or equipment, disable engine as follows:

1. Disconnect spark plug lead(s).
2. Disconnect negative (–) battery cable from battery.

Normal maintenance, replacement or repair of emission control devices and systems may be performed by any repair establishment or individual; however, warranty repairs must be performed by a Kohler authorized dealer found at KohlerEngines.com or 1-800-544-2444 (U.S. and Canada).

Maintenance Schedule

Every 25 Hours¹

• Service/replace precleaner.
• Replace air cleaner element (if not equipped with precleaner).

Every 100 Hours¹

• Replace air cleaner element (if equipped with precleaner).
• Change oil and filter.
• Remove cooling shrouds and clean cooling areas.

Every 100 Hours

• Check that all fasteners are in place and components are properly secured.

Every 200 Hours¹

• Replace unique EFI fuel filter.

Every 300 Hours³

• Change oil and filter (KOHLER PRO 10W-50 oil and KOHLER PRO filter only).

Every 500 Hours²

• Have valve lash checked/adjusted.

Every 500 Hours

• Replace spark plugs and set gap.

¹ Perform these procedures more frequently under severe, dusty, dirty conditions.
² Have a Kohler authorized dealer perform this service.
³ Option only if using KOHLER_® PRO oil and PRO filter.

Oil Recommendations

All-season KOHLER_® PRO 10W-50 Synthetic Oil is the ideal oil for KOHLER engines. It is specifically formulated to extend the oil and oil filter change interval to 300 Hours when paired with a KOHLER PRO Extended Life Oil Filter.

300-Hour oil and oil filter change intervals are exclusive to and only authorized on KOHLER engines that utilize both the KOHLER PRO 10W-50 Synthetic Oil and KOHLER PRO Extended Life Oil Filter. Alternative engine oils and oil filters may be used with KOHLER engines but require 100-Hour oil and oil filter change intervals for proper maintenance. Oil must be API (American Petroleum Institute) service class SJ or higher. Select viscosity based on air temperature at time of operation as shown below.

Check Oil Level

NOTE: To prevent extensive engine wear or damage, never run engine with oil level below or above operating range indicator on dipstick.

Ensure engine is cool. Clean oil fill/dipstick areas of any debris.

1. Remove dipstick; wipe oil off.
2. Reinsert dipstick into tube; press completely down.
3. Remove dipstick; check oil level. Level should be at top of indicator on dipstick.
4. If oil is low on indicator, add oil up to top of indicator mark.
5. Reinstall and secure dipstick.

Change Oil and Filter

Change oil while engine is warm.

1. Clean area around oil fill cap/dipstick. Remove drain plug and oil fill cap/dipstick. Allow oil to drain completely.
2. Clean area around oil filter. Place a container under filter to catch any oil and remove filter. Wipe off mounting surface. Reinstall drain plug. Torque to 10 ft. lb. (13.6 N·m).
3. Place new filter in shallow pan with open end up. Fill with new oil until oil reaches bottom of 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.
6. Fill crankcase with new oil. Level should be at top of indicator on dipstick.
7. Reinstall oil fill cap/dipstick and tighten securely.
8. Start engine; check for oil leaks. Stop engine; correct leaks. Recheck oil level.
9. Dispose of used oil and filter in accordance with local ordinances.

Oil Sentry_™ (if equipped)

This switch is designed to prevent engine from starting in a low oil or no oil condition. Oil Sentry_™ may not shut down a running engine before damage occurs. In some applications this switch may activate a warning signal. Read your equipment manuals for more information.

Fuel Recommendations

Explosive Fuel can cause fires and severe burns.
Do not fill fuel tank while engine is hot or running.

Gasoline is extremely flammable and its vapors can explode if ignited. Store gasoline only in approved containers, in well ventilated, unoccupied buildings, away from sparks or flames. Spilled fuel could ignite if it comes in contact with hot parts or sparks from ignition. Never use gasoline as a cleaning agent.

NOTE: E15, E20 and E85 are NOT approved and should NOT be used; effects of old, stale or contaminated fuel are not warrantable.

Fuel must meet these requirements:

• Clean, fresh, unleaded gasoline.
• Octane rating of 87 (R+M)/2 or higher.
• Research Octane Number (RON) 90 octane minimum.
• Gasoline up to 10% ethyl alcohol, 90% unleaded is acceptable.
• Methyl Tertiary Butyl Ether (MTBE) and unleaded gasoline blend (max 15% MTBE by volume) are approved.
• Do not add oil to gasoline.
• Do not overfill fuel tank.
• Do not use gasoline older than 30 days.

Fuel Line

High pressure fuel line meeting SAE R12 standard must be installed on Kohler Co. engines equipped with an EFI system.

Spark Plugs

Electrical Shock can cause injury.
Do not touch wires while engine is running.

Clean out spark plug recess. Remove plug and replace.

1. Check gap using wire feeler gauge. Adjust gap, see specification table for adjustment.
2. Install plug into cylinder head.
3. Torque plug to 20 ft. lb. (27 N·m).

Jump Starting

Follow all safety guidelines and procedures provided by battery manufacturer and/or original equipment manufacturer (OEM). Failure to follow proper procedures may result in serious personal injury and/or non-warrantable damage to engine's EFI components.

Electronic Fuel Injection (EFI) System

EFI is an electronically-controlled fuel management system which is monitored by an Electronic Control Unit (ECU). A Malfunction Indicator Light (MIL) will illuminate if problems or faults are detected. Servicing by a Kohler authorized dealer is necessary.

Fuel System Components

High pressure components inside fuel pump module are not serviceable. Engines are equipped with special EFI fuel filters. See Maintenance Schedule.

Fuse Replacement

This engine has three (3) blade type automotive fuses. Replacement fuses must have same rating as blown fuse. Use fuse chart below to determine correct fuse.

Wire Color	Fuse Rating
2 Solid Red Wires	10-amp Fuse
1 Red Wire with Black Stripe 1 Red Wire with White Stripe	10-amp Fuse
2 Purple Wires	30-amp Fuse

Air Cleaner

NOTE: Operating engine with loose or damaged air cleaner components could cause premature wear and failure. Replace all bent or damaged components.

NOTE: Paper element cannot be blown out with compressed air.

Move bails on air cleaner cover up; remove latches from cover; remove cover.

Precleaner (if equipped):

1. Remove precleaner from paper element.
2. Replace or wash precleaner in warm water with detergent. Rinse and allow to air dry.
3. Lightly oil precleaner with new engine oil; squeeze out excess oil.
4. Reinstall precleaner over paper element.

Paper Element:

1. Separate precleaner from element; service precleaner and replace paper element.
2. Install precleaner over new paper element and install on base.

Reinstall cover; place latches onto cover; pull down bails to secure cover.

Breather Tube

Ensure both ends of breather tube are properly connected.

Air Cooling

Hot Parts can cause severe burns.
Do not touch engine while operating or just after stopping.

Never operate engine with heat shields or guards removed.

Proper cooling is essential. To prevent over heating, clean screens, cooling fins, and other external surfaces of engine. Avoid spraying water at wiring harness or any electrical components. See Maintenance Schedule.

Repairs/Service Parts

We recommend that you use a Kohler authorized dealer for all maintenance, service, and engine parts. To find a Kohler authorized dealer visit KohlerEngines.com or call 1-800-544-2444 (U.S. and Canada).

Storage

If engine will be out of service for 2 months or more follow procedure below.

1. Add KOHLER PRO Series fuel treatment or equivalent to fuel tank. Run engine 2-3 minutes to get stabilized fuel into fuel system (failure due to untreated fuel are not warrantable).
2. Change oil while engine is still warm from operation (NOT required if using KOHLER PRO 10W-50 full-synthetic oil). Remove spark plug(s) and pour about 1 oz. of engine oil into cylinder(s). Replace spark plug(s) and crank engine slowly to distribute oil.
3. Disconnect negative (–) battery cable.
4. Store engine in a clean, dry place.

Troubleshooting

Do not attempt to service or replace major engine components, or any items that require special timing or adjustment procedures. This work should be performed by a Kohler authorized dealer.

Possible Cause

Problem

No Fuel

Improper Fuel

Dirt In Fuel Line

Broken Fusible Link

Dirty Debris Screen

Incorrect Oil Level

Engine Overloaded

Dirty Air Cleaner

Faulty Spark Plug

Will Not Start

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Hard Starting

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Stops Suddenly

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Lacks Power

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Operates Erratically

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Knocks or Pings

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Skips or Misfires

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Backfires

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Overheats

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High Fuel Consumption

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Engine Specifications

Model	Bore	Stroke	Displacement	Oil Capacity (Refill)	Spark Plug Gap	Maximum Angle of Operation (@ full oil level)*
EZT715 EZT725 EZT740 EZT750	3.27 in. (83 mm)	2.6 in. (67 mm)	44.2 cu. in. (725 cc)	2.0 U.S. qt. (1.9 L)	0.030 in. (0.76 mm)	25°
		2.7 in. (69 mm)	45.6 cu. in. (747 cc)

*Exceeding maximum angle of operation may cause engine damage from insufficient lubrication.

Additional specification information can be found in service manual at KohlerEngines.com.

Any and all horsepower (hp) references by Kohler are Certified Power Ratings and per SAE J1940 & J1995 hp standards. Details on Certified Power Ratings can be found at KohlerEngines.com.

Emission Control System

Exhaust Emission Control System for models EZT715-EZT750 is EM, O2S, ECM, MPI for U.S. EPA, California, and Europe.

NOTE: Tampering with the engine and its emission control system voids the EPA Certificate of Conformity, ARB Executive Order, and EU type-approval.

Documents / Resources

References

• Engines | Rehlko
• http://www.p65warnings.ca.gov

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