146-0657 Carburetor Repair Rebuild Kit for Onan P126G P128G P220G OL16 OL18 OL20 LX720 LX770 LX790 | JLM Marine

Carburetor Repair Rebuild Kit – Fits Onan P126G P128G P220G OL16 OL18 OL20 LX720 LX770 LX790

This carburetor repair rebuild kit is designed for Onan Cummins engines including the P126G, P128G, P220G, OL16, OL18, OL20, LX720, LX770, and LX790 models. It provides a complete seal and gasket solution to restore carburetor performance and eliminate fuel leaks.

This kit directly replaces OEM part number 146-0657 and is compatible with NIKKI carburetors used on Onan engines. It fits a wide range of industrial and power equipment applications, ensuring reliable fuel delivery and smooth engine operation.

• Complete gasket and seal kit for comprehensive carburetor rebuild
• Compatible with multiple NIKKI carburetor part numbers for broad coverage
• Suitable for Miller Onan and Industrial engine applications

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

This carburetor repair kit includes:

• Complete gasket and seal set for Onan Cummins P126G, P128G, P220G, OL16, OL18, OL20, LX720, LX770, LX790 carburetors
• All necessary components for a comprehensive carburetor rebuild

Installation Guide

1. Disconnect the fuel line and remove the carburetor from the engine. Clean the exterior thoroughly before disassembly.
2. Disassemble the carburetor carefully, noting the position of all components. Take photos if needed to aid reassembly.
3. Remove all old gaskets and seals from the carburetor body and mating surfaces. Use a gasket scraper or soft brush to clean residue without scratching metal surfaces.
4. Inspect carburetor components for wear, corrosion, or damage. Replace jets, needles, or floats if worn beyond specification.
5. Install new gaskets and seals from this kit, ensuring proper alignment and fit. Do not reuse old gaskets.
6. Reassemble the carburetor in reverse order, tightening fasteners to manufacturer specifications. Avoid over-tightening to prevent gasket damage.
7. Reinstall the carburetor on the engine and reconnect the fuel line. Check all connections for proper seating.
8. Prime the fuel system and start the engine. Inspect for fuel leaks around all gasket points while the engine is running.
9. Adjust idle and mixture settings as needed for smooth operation. Refer to your engine manual for proper adjustment procedures.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my carburetor?
A: Verify your engine model against the compatibility table above and cross-reference your carburetor part number with the list provided (146-0412 through 146-0700, plus NIKKI models). If your engine is a spec 21112, this kit is not compatible.

Q: What should I do if I still have fuel leaks after installing the new kit?
A: Check that all gaskets are properly aligned and that fasteners are torqued to specification—neither too loose nor over-tightened. Inspect the carburetor body and mating surfaces for cracks, warping, or corrosion that may prevent proper sealing.

Q: Can I reuse any of the old gaskets if they look intact?
A: No, always replace all gaskets and seals during a carburetor rebuild. Even gaskets that appear intact may be compressed or hardened and will not seal properly, leading to fuel leaks and poor performance.

Q: How often should I rebuild my carburetor?
A: Rebuild intervals depend on usage and fuel quality. Inspect your carburetor annually or whenever you notice hard starting, rough idle, fuel leaks, or poor performance. Equipment stored with old fuel may require more frequent rebuilds.

Q: Is this an OEM part or aftermarket replacement?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.