Carburetor Repair Kit for Onan P-Series Engines – Replaces 146-0657, 146-0478 and 146-6100
Carburetor Repair Kit for Onan P-Series Engines – Replaces 146-0657, 146-0478 and 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
Orders are typically processed within 1–2 business days.
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Carburetor Repair Kit for Onan P-Series Engines – Replaces 146-0657...
Carburetor Repair Kit for Onan P-Series Engines – Replaces 146-0657, 146-0478 and 146-6100 is backordered and will ship as soon as it is back in stock.
Product Details
Restore reliable fuel-system operation with this aftermarket carburetor repair kit for selected Onan P-Series and related engines. The kit is intended for engines equipped with compatible Nikki-brand carburetors, including the applications listed below. Always compare the carburetor, gasket style and existing part numbers before ordering.
This kit is listed as a replacement for Onan part numbers 146-0657, 146-0650, 146-0478 and 146-6100. These references should be used together with the carburetor and engine application information to confirm fitment.
- Designed for rebuilding compatible Nikki carburetors.
- Includes replacement gaskets, float components, valve and other rebuild parts listed below.
- For gasoline fuel systems.
- Aftermarket replacement component; it is not an original equipment manufacturer part.
Part Number Matrix
Use this matrix to compare the listed OEM references.
| Brand | Part Number | Superseded By |
|---|---|---|
| Onan | 146-0650 | 146-0657 |
| Onan | 146-0657 | |
| Onan | 146-0478 | |
| Onan | 146-6100 |
Engine & Model Compatibility
The following applications are listed for this kit when equipped with a compatible Nikki-brand carburetor. Model, specification, serial and carburetor details can vary, so confirm the identification markings on your engine and carburetor before purchase.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Onan | P216G | 16 | 4-Stroke | 146-0657 | 146-0650 listed as superseded |
| Onan | P218G | 18 | 4-Stroke | 146-0657 | 146-0650 listed as superseded |
| Onan | P220G | 20 | 4-Stroke | 146-0657 | 146-0650 listed as superseded |
| Onan | P224G | 24 | 4-Stroke | 146-0657 | 146-0650 listed as superseded |
| 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 application as LX720 |
| Onan | OL18 | 18 | 4-Stroke | 146-0657 | Same application as LX770 |
| Onan | OL20 | 20 | 4-Stroke | 146-0657 | Same application 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 specification F |
The kit is also listed for the following Onan-installed Nikki carburetor part numbers:
| Onan Carburetor Part Number | Application | Notes |
|---|---|---|
| 146-0388 | Nikki carburetor | For listed P-Series applications |
| 146-0389 | Nikki carburetor | For listed P-Series applications |
| 146-0412 | Nikki carburetor | For listed P-Series applications |
| 146-0428 | Nikki carburetor | For listed P-Series applications |
| 146-0430 | Nikki carburetor | For listed P-Series applications |
| 146-0478 | Nikki carburetor | For listed P-Series applications |
| 146-0479 | Nikki carburetor | For listed P-Series applications |
| 146-0495 | Nikki carburetor | For listed P-Series applications |
| 146-0496 | Nikki carburetor | For listed P-Series applications |
| 146-0659 | Nikki carburetor | For listed P-Series applications |
| 146-0697 | Nikki carburetor | For listed P-Series applications |
| 146-0698 | Nikki carburetor | For listed P-Series applications |
| 146-0700 | Nikki carburetor | For listed P-Series applications |
Technical Specs
- Product Type
- Carburetor repair kit
- Installation
- Replacement components for compatible Nikki carburetors
- 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
- For listed Nikki-brand carburetors
- Additional Note
- Confirm carburetor number and gasket style before purchase
- Warranty
- 6 months, as reported in seller information
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 — verify gasket style before installation
- 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. Inspect the existing gasket and compare it with the product images before purchasing or installing the kit. Do not force a gasket that does not match the carburetor bowl.
Application note: This listing is not intended for Onan generator or genset applications unless the engine and carburetor identification specifically confirms compatibility.
- Disconnect the battery and allow the engine to cool completely.
- Turn off the fuel supply and safely drain remaining fuel from the carburetor.
- Remove the air-cleaner assembly carefully.
- Disconnect the fuel lines, throttle and choke linkages, recording their positions for reassembly.
- Remove the carburetor from the engine.
- Disassemble the carburetor on a clean workbench and note the position of each part.
- Clean suitable metal components with carburetor cleaner. Keep cleaner away from non-metal parts and rubber components.
- Replace the old gaskets, float valve and other worn components with the corresponding parts in the kit.
- Reassemble the carburetor and ensure that all parts are correctly seated.
- Reinstall the carburetor and reconnect all lines and linkages.
- Restore the fuel supply, reconnect the battery and check carefully for leaks before starting the engine.
Troubleshooting & FAQ
How do I confirm that this kit fits my Onan engine?
Confirm both the engine model and the carburetor identification. This kit is listed for the Onan applications and Nikki carburetor numbers shown on this page, but model variations may exist. Compare your original carburetor and gasket before ordering.
What are common signs that a carburetor needs rebuilding?
Common symptoms include hard starting, stalling at low speed, rough idling, black exhaust smoke from an overly rich mixture, and visible fuel leakage around the carburetor.
My carburetor bowl gasket looks different. What should I do?
Do not install the kit. The listed applications may use different gasket styles. Compare the existing bowl gasket with the product images and confirm the correct style before purchase. Do not operate the engine if the gasket does not seat correctly.
Can I use this kit for my Onan generator?
This listing is not intended for Onan generator or genset applications unless the exact engine and carburetor identification confirms a match. Confirm the application before installation.
Is this an OEM part?
No. This is an aftermarket replacement kit intended for the compatible applications and carburetors listed on this page.
What are the shipping speed and cost?
Worldwide shipping is available. Typical transit time is 5–15 days, and standard shipping is free for most regions. Expedited options, when available, are shown at checkout based on destination.
What is the warranty and return policy?
The product is listed with a 6-month warranty against manufacturing defects under normal use, based on seller information. Contact support with your order details if a problem occurs. Returns are subject to the applicable policy and generally require the item to be unused and in its original condition.
Safety & Important Info
- Verify the engine model, carburetor number, gasket style and product images before purchase.
- If any identification detail differs, do not install the kit until compatibility has been confirmed.
- This is an aftermarket replacement component, not an OEM part.
- Work in a well-ventilated area, keep fuel away from ignition sources and follow the engine manufacturer's safety procedures.
- Professional installation is recommended when servicing fuel-system components.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts designed for dependable real-world service.
- Fast Global Fulfillment — Free standard delivery is available to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing with attention to materials and quality control.
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