Butom Subaru/Robin EX17 SP170 Carburetor – 6.0HP Replacement, 20mm Throttle & 14mm Venturi

The Butom Subaru Robin EX17 SP170 carburetor is a direct-replacement carb designed to restore reliable fuel delivery for 6.0HP Subaru/Robin EX17, SP-170, EX13 and related small engines.

If your small engine is running rough, flooding, or failing to maintain idle, a properly matched carburetor often fixes the fuel-delivery issues. This Butom unit replaces Subaru Robin part numbers 277-62301-30, 277-62301-60, 277-62303-00 and 277-62303-20 and fits many EX17-series 6.0HP engines (including EX17, EX17D, EX170, EX170D, EX13, EX30, EP17 and SP170 variants). It’s built from corrosion-resistant metals and high-density components, and each carburetor is wet-flow tested so the part ships ready for predictable performance.

How will this carburetor improve engine starting and idle?

By restoring correct fuel metering and choke function, the replacement carburetor helps eliminate hard starting, excessive smoke, and unstable idling. The factory-matched throttle and venturi sizes maintain original airflow and fuel ratios expected by the EX17-series engines.

• Precision-matched throttle diameter (20 mm) and venturi (14 mm) for proper mixture
• Choke diameter 24.5 mm for consistent cold starts
• Wet-flow tested to simulate real operating conditions before shipment

What engines and part numbers does this unit replace?

This carburetor is engineered as a replacement for multiple Subaru/Robin numbers and fits the 6.0HP small-engine family. Use it when your equipment lists one of the compatible part numbers or engine models to ensure a correct fit.

• Replaces Subaru Robin part numbers: 277-62301-30, 277-62301-60, 277-62303-00, 277-62303-20
• Fits engines: EX17, EX17D, EX170, EX170D, EX13, EX30, EP17, SP170 and other EX17-series variants
• Compatible with engine codes such as EX170D40200, EX170D50040–50043, EX170D50100–50102, EX170D50170–50171, EX170DM2231

What materials and quality controls are used in this carburetor?

The Butom replacement emphasizes corrosion resistance and dimensional stability using a mix of metals and reinforced plastics. Components are selected to resist heat, wear, and fuel corrosion so the part stays serviceable in harsh outdoor environments.

• Anodized aluminum carburetor body for strength and light weight
• Zinc-plated float bowl and brass internal components to resist corrosion
• High-density plastic float to maintain float-level accuracy under fuel exposure
• Wet-flow testing mimics engine conditions to verify fuel delivery before shipping

What are the mounting and connection dimensions I need to check?

Verifying a few key dimensions prevents returns and ensures you get a bolt-on replacement. Confirm the mounting hole spacing and inlet sizes on your engine prior to ordering.

• Mounting hole center-to-center distance: 42 mm
• Throttle bore diameter: 20 mm; choke diameter: 24.5 mm; venturi diameter: 14 mm
• Fuel inlet hose size: 7 mm

Who is this for: This replacement carburetor is intended for owners, mechanics, and equipment technicians who service 6.0HP Subaru/Robin small engines used in generators, water pumps, pressure washers, and light-duty commercial machines. Choose this part if your engine references the listed Subaru/Robin part numbers or EX17-series engine codes and you need a robust, pre-tested carburetor that reinstates factory-like fuel flow without extensive modification.