Small Engine EFI Conversion: Engine and Carburetor Reference

Converting a small engine from a carburetor to EFI starts with identifying the exact engine and intake hardware. The reference below collects engine, carburetor and throttle-body information from the original Löweheiser conversion article.

This is a historical starting point for a technical enquiry, not a verified compatibility or stock list. Model revisions, unknown entries and the complete installation must be checked before selecting components.

What to confirm before converting an engine

• Engine model and revision, fuel and lubrication requirements.
• Carburetor reference, mounting-hole spacing and actual intake dimensions.
• Throttle-body clearance, actuation, fuel-system and electrical requirements.
• Calibration and testing needed for the intended operating range.

A matching bolt pattern does not establish that an engine needs no other changes. See the Walbro and throttle-body dimensional reference for the difference between venturi and throttle bore.

Historical engine conversion references

Dimensions are reproduced from the original table and have not been independently re-measured in this update. A blank or unknown entry means that confirmation is required; it does not mean compatibility is established.

From a reference dimension to a working EFI configuration

Use the table to identify questions for the supplier, then confirm the engine-specific hardware, fuel supply, electrical requirements and calibration. Browse Löweheiser EFI systems and EFI engine options.

Discuss your application

Send us your engine model, intended fuel, operating requirements and available installation details. Discuss your configuration with Löweheiser.