Keeping your Kohler engine in peak condition starts with routine maintenance, especially changing the spark plug, Using the correct spark plug isn’t just a recommendation, it’s essential.
Kohler Spark Plug Chart
| Engine Model | OEM Spark Plug | NGK Equivalent | Champion Equivalent | Gap (inches) |
|---|---|---|---|---|
| K-Series | ||||
| K90-K181 | 41 132 06-S / 41 132 02-S | CJ8, RCJ8 | J19LM, CJ8, RCJ8 | 0.025 |
| K241-K341 | 25 132 10-S / 41 132 02-S | H10C, RH10C | H10C, RH10C, CJ8, RCJ8 | 0.035 |
| K361 | 25 132 10-S | H10C, RH10C | H10C, RH10C | 0.035 |
| K482-K582 | 25 132 10-S | H10C, RH10C | H10C, RH10C | 0.035 |
| K660-K662 | 41 132 06-S | J19LM | J19LM, RJ19LM | 0.025 |
| KT17-KT21 | 52 132 02-S | RV17YC | RV17YC | 0.025 |
| Magnum Series | ||||
| M8 | 41 132 02-S | CJ8, RCJ8 | CJ8, RCJ8 | 0.025 |
| M10-M16 | 25 132 10-S | H10C, RH10C | H10C, RH10C | 0.025 |
| M18, M20 | 52 132 02-S | RV17YC | RV17YC | 0.035 |
| MV16-MV20 | 52 132 02-S | RV17YC | RV17YC | 0.035 |
| Command Series | ||||
| CH5, CH6 | 12 132 02-S | RC12YC | RC12YC | 0.040 |
| CH11-CH16 | 12 132 02-S | RC12YC | RC12YC | 0.040 |
| CH18-CH26 | 12 132 02-S | RC12YC | RC12YC | 0.030 |
| CH410-CH450 | 12 132 02-S | RC12YC | RC12YC | 0.030 |
| CH620-CH670 | 12 132 02-S | RC12YC | RC12YC | 0.030 |
| CH730-CH750 | 12 132 02-S | RC12YC | RC12YC | 0.030 |
| CH940-CH1000 | 62 132 04-S | XC10YC | XC10YC | 0.030 |
| Courage Series | ||||
| SV470-SV620 | 12 132 02-S | RC12YC / QC12YC | RC12YC / QC12YC | 0.030 |
| SV710-SV840 | 12 132 02-S | RC12YC / QC12YC | RC12YC / QC12YC | 0.030 |
| SV730 (Pro) | 12 132 02-S | 3071 | 3071 | 0.030 |
| OHC Triad Series | ||||
| TH16, TH18 | 12 132 02-S | RC12YC | RC12YC | 0.030 |
| TH520-TH650 | 12 132 02-S | RC12YC | RC12YC | 0.030 |
| Aegis Series | ||||
| LH640-LH775 | 66 132 01-S | RC14YC | RC14YC | 0.030 |
| LH560-LH675 | 66 132 01-S | RC14YC | RC14YC | 0.030 |
| CS Series | ||||
| CS4-CS12 | 66 132 01-S | RC14YC | RC14YC | 0.040 |
| CS12.75, CS13 | 12 132 02-S | RC12YC | RC12YC | 0.040 |
| CV Series | ||||
| CV11-CV16 | 12 132 02-S | RC12YC | RC12YC | 0.040 |
| CV11-CV16 (LPG) | 25 132 08-S | RC78PYP / 2412 | RC78PYP / 2412 | 0.030 |
| CV430-CV493 | 12 132 02-S | RC12YC | RC12YC | 0.030 |
| CV620-CV680 | 12 132 02-S | RC12YC | RC12YC | 0.030 |
| CV724-CV750 | 12 132 02-S | RC12YC | RC12YC | 0.030 |
| CV940-CV1000 | 62 132 04-S | XC10YC | XC10YC | 0.030 |
Related Kohler Valve Clearance Chart(For All Models Series)
Why Choosing the Right Spark Plug Matters
- Poor engine performance
- Increased fuel consumption
- Hard starts
- Shorter engine life
Choosing the right one ensures optimal combustion, smooth operation, and lower emissions.
Understanding Spark Plug Codes
Spark plugs are coded with specific letters and numbers, which define their thread size, heat range, construction type, and reach. For example, an NGK BKR5E plug breaks down into:
- BKR – Thread size and design
- 5 – Heat range
- E – Thread length
Related Husqvarna Spark Plug Chart(For All Types & Models)
How to Check Your Spark Plug Condition
A healthy spark plug will have a light tan color. Here’s how to inspect it:
- Remove the spark plug using a wrench.
- Look for signs of carbon buildup or oil fouling.
- Check the electrode and porcelain insulator.
How Often Should You Replace Spark Plugs?
For Kohler engines, replace the spark plug every 100-150 hours of use or annually, whichever comes first. Heavy use or dusty environments might require more frequent replacement.
Signs You Need a New Spark Plug
- Engine misfires or runs rough
- Difficulty starting
- Increased fuel consumption
- Poor acceleration
- Excessive smoke from the exhaust
Related John Deere Spark Plug Gap Chart(For All Models)
Tools Needed for Spark Plug Replacement
- Spark plug wrench or socket (usually 13/16″)
- Gap gauge
- Torque wrench (optional but recommended)
- Anti-seize compound (optional)
- Clean rag
Step-by-Step: How to Replace a Kohler Spark Plug
- Let the engine cool completely.
- Disconnect the spark plug wire.
- Use a socket wrench to remove the old plug.
- Check the gap on the new plug (adjust to spec).
- Apply anti-seize compound (optional).
- Thread in the new plug by hand, then tighten with a wrench.
- Reconnect the spark plug wire.
Spark Plug Maintenance Tips
- Clean spark plugs every 50 hours.
- Avoid overtightening, follow torque specs.
- Store spare plugs in a dry, cool place
- Use dielectric grease for better ignition connection.
FAQs
What’s the spark plug gap on a Kohler engine?
The spark plug gap on a Kohler engine typically ranges between 0.025 to 0.040 inches, depending on the engine model. For example:
- Older K-Series engines like the K181 usually require a gap of 0.025 inches.
- Newer Command Pro and Courage engines commonly require a gap of 0.030 inches.
- Some modern engines like the CH/CV740-750 may recommend 0.040 inches.
How do I find out what spark plugs I need?
To identify the correct spark plug for your Kohler engine:
- Locate the engine model number, which is typically found on a metal tag or decal on the engine.
- Refer to the engine manual or visit Kohler’s official parts lookup.
- Match the OEM spark plug number to aftermarket equivalents from NGK, Champion, or other brands using a cross-reference chart.
- If you’re unsure, use an online lookup tool or consult a certified Kohler dealer.
What size spark plug for Kohler 5400 Series?
For the Kohler 5400 Series engines, such as models KT715, KT725, and KT730, the recommended spark plug is usually:
- OEM: Kohler 25 132 14-S
- NGK Equivalent: BKR5E
- Gap: 0.030 inches
This series is part of the Courage PRO line, so double-check the model prefix before purchasing.
How do you match spark plugs?
Matching spark plugs involves:
- Thread size and reach: It must fit the cylinder head correctly.
- Heat range: Affects how quickly the plug transfers heat from the combustion chamber.
- Electrode configuration: This should match the engine’s ignition system.
- Cross-referencing: Use the original spark plug part number to find compatible aftermarket options (e.g., NGK, Champion).
- Manufacturer guides: Use online cross-reference tools from plug manufacturers or the engine manufacturer.
Warning: Using the wrong plug can lead to poor performance or engine damage.
What is the correct spark plug gap?
The correct spark plug gap is the distance between the center and ground electrode and varies by engine type. In Kohler engines, the general range is:
- 0.025″ to 0.040″
Common gaps by series:
- Older models (K-series): 0.025″
- Modern Command/Courage engines: 0.030″
- Triad OHC and 7000 series: up to 0.040″
Use a feeler gauge to set the correct gap. Too wide or too narrow a gap can lead to misfires, fouling, or hard starting.
What is the coil gap on a Kohler engine?
The coil air gap (between the ignition coil and the flywheel magnets) is critical for a proper spark. For most Kohler engines, the coil gap should be:
- 0.010″ to 0.014″
To set the coil gap:
- Place a non-magnetic feeler gauge or business card between the coil and flywheel.
- Loosen the coil screws, align it with the magnet, then tighten.
- Remove the gauge or card and check for uniform spacing.
How do I know if my spark plug is bad?
If your engine misfires, starts hard or runs poorly—it might be a faulty spark plug.
Are all Kohler engine spark plugs the same?
No. Spark plug type varies by engine series and usage. Refer to the specific model chart.
Final words
Maintaining your Kohler engine starts with understanding the small yet crucial parts, like the spark plug. Using the correct one, checking it regularly, and replacing it when necessary can extend your engine’s life and ensure top performance. Use this Kohler spark plug chart as your go-to guide to make confident decisions every time.
