Kohler Carburettor Kits: Finding Replacements

For owners of Kohler-powered machinery, from lawnmowers to generators, a functioning carburettor is absolutely essential. When this vital component begins to falter, finding the correct replacement parts, especially carburettor kits, can sometimes feel like a treasure hunt. Many original Kohler carburettor kits are no longer in production, leading many to search for alternatives or professional rebuilding services. This guide aims to shed light on which carburettors are used in various Kohler engines and where you might find the parts you need to get your equipment back to its best.

Understanding Kohler Carburettor Models

Kohler engines have utilised a variety of carburettor models over the years, with the Carter Model N series being a common fixture in many of their smaller engines. Identifying the correct carburettor for your specific engine model is the first crucial step. The information available suggests a strong relationship between certain Carter Model N carburettors and specific Kohler engine series:

Carter Model N #13 or #16 Carburettor

This carburettor is specifically designed for Kohler engine models K90 and K91. It is also compatible with certain low RPM K141 engines. Key identifiers include a tapered/inverted cone-shaped float bowl and float. The throttle bore measures .810" in diameter, with a venturi measuring .542" diameter. It's important to note that when fitted to larger Kohler engines like the K141, K160/K161, L160/L161, L181, K181, or M8, the smaller throttle bore and restrictive venturi may limit the engine's maximum power output at higher RPMs, similar to using an undersized carburettor in a car.

Original Kohler Part Number: 46 053 03

Original Carter Part Numbers: A-220100, A-230246, A-230444, E-220517, F-220762, G-220517, 220451, 220574, 220745, 220777, 230501.

Carter Model N #18 Carburettor

This model is designed for Kohler engine model K141. It features a throttle bore of .823" diameter and a venturi of .550" diameter. When used on larger engines (K160/K161, L160/L161, L181, K181, M8), the smaller venturi can restrict airflow, potentially reducing peak power. Conversely, using it on smaller engines like the K90/K91 might cause hesitation due to the larger venturi.

Original Kohler Part Numbers: 41 053 06, 41 053 13

Original Carter Part Numbers: A-231966, B-231469, G-220517.

Carter Model N #20 Carburettor

This carburettor is specifically intended for Kohler engine models K160/K161. It has a throttle bore of .823" diameter and a venturi of .612" diameter. Similar to the #18, using this on smaller K90/K91 or K141 engines could lead to performance issues due to the larger venturi. On larger L160/L161, L181, K181, or M8 engines, the smaller venturi might limit top-end power.

Original Kohler Part Numbers: 41 053 06, 41 053 14

Original Carter Part Numbers: A-230798, B-231231, B-231450, B-231469, C-231738, E-231480, E-231488, E-231489, F-230350, F-230501, G-220517, G-230500.

Carter Model N #22 Carburettor

This is a more common carburettor for Kohler engines, often found on models L160/L161, L181, K181, and M8. It features a throttle bore of .823" diameter and a larger venturi of .682" diameter. This larger venturi allows for full power on the engines it's designed for. However, when fitted to smaller engines like K90/K91, K141, or K160/K161, it may cause hesitation as the engine might not generate sufficient air velocity to draw fuel correctly. Some #22 carburettors may have 2 or 3 air cleaner mounting holes, so check your existing unit.

Original Kohler Part Numbers: 41 053 01, 41 053 04, 41 053 05, 41 053 06, 41 053 18, 41 053 20

Original Carter Part Numbers: A-230798, A-231741, A-234631, B-231739, C-231738, F-230350, F-230501, F-230502, G-220517.

Where to Find Kohler Carburettor Kits and Replacements

The reality for many owners is that specific Kohler carburettor kits are often discontinued. This means you'll likely need to explore alternative avenues:

Professional Rebuilding Services

One of the most reliable ways to get a functioning carburettor is through professional rebuilding. Services like A-1 Miller's Professional Repair Service offer to rebuild your existing OEM Carter or Kohler carburettor. This ensures you get a part specifically designed for your engine, rebuilt to a high standard.

Cost of Rebuilding: The price typically ranges from £55.00 to £115.00 (approx.) for parts and labour, plus return shipping. This cost can vary depending on the specific parts required and the amount of labour involved.

Rebuilt Carburettors for Sale: Companies that offer rebuilding services often have pre-rebuilt carburettors available for purchase. These usually come with a core charge, which is refunded when you return your old, rebuildable carburettor. Prices for professionally rebuilt units can range from approximately £135.00 to £260.00, depending on the model and whether a core is traded in.

Aftermarket Carburettors

High-quality aftermarket carburettors are also available. For instance, a replicated fully adjustable Carter Model N #22 carburettor is mentioned, suitable for engines like the L160/L161, L181, K181, and M8. These often cost around £55.00 plus shipping. While a more budget-friendly option, it's crucial to ensure the specifications match your engine's requirements, as using one with an incorrectly sized venturi can affect performance.

Original Kohler Carburettor Kit Part Number

While many kits are discontinued, a specific Kohler carburettor kit part number mentioned is 2475718S. The price quoted for this kit was around £185.00. If you can find this specific part number, it's likely to be the most direct replacement.

Common Reasons for Carburettor Issues

Several factors can lead to a Kohler small engine carburettor needing attention:

• Old Fuel: Degraded fuel can leave deposits that clog internal passages.
• Lack of Use: Stagnant fuel in the carburettor can gum up the works.
• Dirt and Debris: Contaminants entering the fuel system can obstruct the fine jets and passages.
• Incorrect Adjustments: Altitude, temperature, and humidity can all affect the optimal air-fuel mixture.

If your engine is running rough, sputtering, or not starting, a dirty or poorly adjusted carburettor is a prime suspect. Before condemning the carburettor entirely, it's worth checking the engine's valve clearances, as insufficient clearance can mimic carburettor problems.

Important Considerations for Shipping Carburettors

If you are sending your carburettor for rebuilding, follow these important guidelines to ensure safe and successful transit:

• Use a Tracking Service: Always use USPS, FedEx, or UPS with a tracking number.
• Secure Packaging: Pack the carburettor securely to prevent damage. Place it in a sealed zip-lock bag to contain fuel odours and prevent the loss of small parts.
• Odour Control: To prevent packages from being rejected due to fuel smell, consider placing an air freshener inside the bag with the carburettor.
• Include Detailed Information: Provide your name, complete postal address, phone number, a clear description of the work required, how the engine is used, and any other parts needed.

Pricing Summary

Here's a general overview of costs:

Frequently Asked Questions

Q1: My Kohler engine is running poorly. Could it be the carburettor?

A1: Yes, a poorly running engine is often a sign of a carburettor issue, especially if the equipment has been stored with old fuel. Also, check your valve clearances as this can sometimes be mistaken for a carburettor problem.

Q2: Can I use a carburettor from a different Kohler engine model?

A2: While some carburettors may physically fit, using one with different internal dimensions (like venturi or throttle bore size) can negatively impact your engine's performance. It's best to use the carburettor specifically designed for your engine model.

Q3: Where can I find parts for older Kohler carburettors?

A3: Since many original kits are discontinued, your best options are specialist engine parts suppliers who may stock leftover inventory, or professional rebuilding services that can source or fabricate necessary parts.

Q4: How do I adjust the air/fuel mixture on my Kohler carburettor?

A4: Adjustment procedures vary by model, but typically involve turning the idle mixture screw in until the engine starts to falter, then backing it out about 1 to 1.5 turns. Final adjustments should be made once the engine is running smoothly under load, considering local altitude and temperature.

Keeping your Kohler engine running efficiently often comes down to maintaining its fuel system, and the carburettor is at the heart of it. While finding specific kits can be challenging, the availability of professional rebuilding services and quality aftermarket parts ensures that your equipment can be kept operational for years to come.