Carburetor Repair Kit – Fits Onan P-Series (Replaces 146-0657, 146-0478, 146-6100)
Carburetor Repair Kit – Fits Onan P-Series (Replaces 146-0657, 146-0478, 146-6100) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Carburetor Repair Kit – Fits Onan P-Series (Replaces 146-0657, 146-...
Carburetor Repair Kit – Fits Onan P-Series (Replaces 146-0657, 146-0478, 146-6100) is backordered and will ship as soon as it is back in stock.
Product Details
Restore peak performance to your Onan engine with this comprehensive Carburetor Repair Kit – Fits Onan P216G, P218G, P220G, P224G Engines (Replaces 146-0657, 146-0478, 146-6100). This kit is specifically designed for Onan P-Series engines equipped with Nikki brand carburetors, including models P216G, P218G, P220G, P224G, and related variants like OL16, OL18, OL20, LX720, LX770, LX790, and B48G models.
It serves as a direct aftermarket replacement for Onan part numbers 146-0657, 146-0650, 146-0478, and 146-6100, ensuring a precise fit and function.
- Designed for a direct OEM-replacement installation on compatible Nikki carburetors.
- Includes all essential components for a standard rebuild, such as gaskets, float assembly, and fuel filter.
- Engineered for use with gasoline fuel systems.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Onan | 146-0650 | 146-0657 |
| Onan | 146-0657 | |
| Onan | 146-0478 | |
| Onan | 146-6100 |
Engine & Model Compatibility
Confirm your engine model in the table below. This kit is intended for engines equipped with a Nikki-brand carburetor only.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Onan | P216G | 16 | 4-Stroke | 146-0657 | Superseded 146-0650 |
| Onan | P218G | 18 | 4-Stroke | 146-0657 | Superseded 146-0650 |
| Onan | P220G | 20 | 4-Stroke | 146-0657 | Superseded 146-0650 |
| Onan | P224G | 24 | 4-Stroke | 146-0657 | Superseded 146-0650 |
| Onan | LX720 | 4-Stroke | 146-0657 | Also listed as OL16 | |
| Onan | LX770 | 4-Stroke | 146-0657 | Also listed as OL18 | |
| Onan | LX790 | 4-Stroke | 146-0657 | Also listed as OL20 | |
| Onan | OL16 | 16 | 4-Stroke | 146-0657 | Same as LX720 |
| Onan | OL18 | 18 | 4-Stroke | 146-0657 | Same as LX770 |
| Onan | OL20 | 20 | 4-Stroke | 146-0657 | Same as LX790 |
| Onan | B48G-GA020 | 4-Stroke | 146-0657 | Miller Onan Engine | |
| Onan | B48G-GA19.9 | 4-Stroke | 146-0657 | Miller Onan Engine | |
| Onan | P126G | 4-Stroke | 146-0657 | ||
| Onan | P128G | 4-Stroke | 146-0657 | ||
| Onan | T260G | 4-Stroke | 146-0657 | Beginning Spec F |
This repair kit is compatible with the following Onan-installed Nikki carburetor models:
| Onan Carb Part Number | Application | Notes |
|---|---|---|
| 146-0388 | Nikki Carburetor | For P-Series engines |
| 146-0389 | Nikki Carburetor | For P-Series engines |
| 146-0412 | Nikki Carburetor | For P-Series engines |
| 146-0428 | Nikki Carburetor | For P-Series engines |
| 146-0430 | Nikki Carburetor | For P-Series engines |
| 146-0478 | Nikki Carburetor | For P-Series engines |
| 146-0479 | Nikki Carburetor | For P-Series engines |
| 146-0495 | Nikki Carburetor | For P-Series engines |
| 146-0496 | Nikki Carburetor | For P-Series engines |
| 146-0659 | Nikki Carburetor | For P-Series engines |
| 146-0697 | Nikki Carburetor | For P-Series engines |
| 146-0698 | Nikki Carburetor | For P-Series engines |
| 146-0700 | Nikki Carburetor | For P-Series engines |
Technical Specs
- Product Type
- Carburetor Repair Kit
- Installation
- Direct OEM replacement
- Fuel Type
- Gasoline
- Connection
- Nikki carburetor specific
- Dimensions
- 7.95 x 5.63 x 1.54 in (201.93 x 143 x 39.12 mm)
- Fitting Type
- Nikki brand carburetor specific
- Additional Note
- For Nikki brand carburetors only
- Warranty
- 6 Months (per eBay seller)
What’s in the Box
- 1 x Air Horn Gasket
- 4 x Set Screws
- 1 x Float Valve
- 1 x Float Pin
- 1 x Float Assembly
- 2 x Gaskets (Note: Verify style before installing)
- 2 x O-Rings
- 1 x Fuel Filter
- 3 x Straps
- 2 x Rubber Pipes
Installation Notes
Important: Onan used two different carburetor bowl gasket styles. Please carefully inspect your existing gasket and compare it to the images to ensure this kit contains the correct style for your carburetor before purchasing or installing.
Exclusion Note: This carburetor repair kit is not compatible with Onan generator (genset) applications.
- Disconnect the battery and ensure the engine is cool.
- Turn off the fuel supply and safely drain any remaining fuel from the carburetor.
- Carefully remove the air cleaner assembly.
- Disconnect the fuel lines, throttle, and choke linkages from the carburetor. Note their positions for reassembly.
- Remove the carburetor from the engine.
- Disassemble the carburetor on a clean workbench, taking note of the location of each part.
- Clean all metal components with carburetor cleaner. Do not spray cleaner on non-metal parts.
- Replace the old gaskets, float valve, and other components with the new parts from the kit.
- Reassemble the carburetor, ensuring all parts are correctly seated.
- Reinstall the carburetor onto the engine, reconnecting all lines and linkages.
- Turn the fuel supply back on, reconnect the battery, and check for leaks before starting the engine.
Troubleshooting & FAQ
How do I confirm this kit fits my Onan engine?
This kit is designed for the Onan P-Series and related engines listed in the compatibility table, but only if they are equipped with a Nikki-brand carburetor. The surest way to confirm fitment is to match your carburetor part number to the list of compatible Nikki carburetors provided on this page.
What are common signs that my carburetor needs a rebuild?
Symptoms indicating a carburetor rebuild is needed include difficulty starting the engine, stalling at low speeds, rough idling, black smoke from the exhaust (running rich), or visible fuel leaks from the carburetor body.
My carburetor bowl gasket looks different. What should I do?
Do not install the kit. Onan used two different gasket styles for these carburetors. This kit includes one common style. You must compare your existing bowl gasket with our product images to verify an exact match before purchase. Returns of used or installed kits cannot be accepted.
Can I use this kit for my Onan generator?
No. Authoritative sources explicitly state this kit is not for use in Onan generator (genset) applications. Using it in a generator may lead to improper function or engine damage.
Is this an OEM part?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials and manufactured in an ISO 9002 facility, where it is batch-inspected for consistency.
What are the shipping speed and cost?
We ship worldwide quickly—typical transit time is 5–15 days. Standard shipping is free for most regions; expedited options will appear at checkout if available for your location.
What is the warranty and return policy?
This product is covered by a 6-month warranty against manufacturing defects under normal use, based on seller information. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our full policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model is listed as compatible—do not order.
- This is an aftermarket replacement component, not an original equipment manufacturer (OEM) part.
- Professional installation is highly recommended to ensure safety and proper performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or quality control.
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