Description
Carburetor Rebuild Kit for ONAN Engine DD11, DD13, DD15 — BF, BG, B43M, B48M
Restore reliable starting and smooth operation to your ONAN flathead engine with this complete carburetor rebuild kit. Designed for ONAN generator, welder, and industrial engines including DD11, DD13, DD15, BF, BG, B43M, and B48M series. Replaces the expensive ONAN kit 142-0570 with all gaskets, seals, needle/seat, and fuel pump components.
What's Included
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Carburetor bowl gasket — Precision-cut to ONAN carb flange profile
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Needle & seat assembly — Viton-tipped inlet needle for positive fuel shut-off
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Float bowl O-ring — Fuel-resistant for modern ethanol fuels
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Fuel pump diaphragm & gaskets — Complete fuel pump rebuild components
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Mounting flange gasket — Carb-to-intake manifold seal
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Throttle shaft seals — Prevents vacuum leaks at shaft bushings
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Idle mixture screw with O-ring — Restores proper idle adjustment range
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All necessary hardware — Springs, clips, and small components
Compatible ONAN Engine Models
| Engine Series |
Application |
Typical Equipment |
| DD11 |
Single-cylinder, 11 HP |
Generators, welders, pumps |
| DD13 |
Single-cylinder, 13 HP |
Industrial generators, compressors |
| DD15 |
Single-cylinder, 15 HP |
Large-frame generators, welders |
| BF |
Opposed twin |
RV generators, commercial mowers |
| BG |
Opposed twin |
Generator sets, ag equipment |
| B43M |
Opposed twin, 16-20 HP |
Garden tractors, utility vehicles |
| B48M |
Opposed twin, 18-24 HP |
Commercial turf equipment |
When to Rebuild Your ONAN Carburetor
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Hard starting — Requires excessive cranking, especially after sitting
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Rough idle or stalling — Won't hold steady RPM, stalls under load
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Fuel leaks — Wet carb body or dripping from bowl area
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Surging or hunting — RPM cycles up and down at steady throttle
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Ethanol degradation — Old fuel has varnished the internal passages
Frequently Asked Questions
Q: Does this kit replace ONAN part #142-0570?
A: Yes. This kit includes all components found in the OEM ONAN 142-0570 carburetor rebuild kit, plus additional fuel pump parts, at a significantly lower cost.
Q: Will this fit my ONAN generator in my RV?
A: It depends on the generator model. This kit fits ONAN DD-series and BF/BG flathead engines. If your RV generator uses BGE, BGM, or Marquis series (OHV), this is not the correct kit. Check your generator data plate.
Q: Do I need special tools for the rebuild?
A: Basic hand tools are sufficient — screwdrivers, needle-nose pliers, and a 1/4-inch socket set. Carb cleaner and compressed air help clean passages. The rebuild takes approximately 1-2 hours.
Q: Are these parts compatible with ethanol-blended fuel?
A: Yes. All gaskets, seals, and the Viton needle tip are manufactured from modern materials engineered to resist E10/E15 ethanol fuel degradation.
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