Onsnail Carburetor for Briggs & Stratton Engines — 5-4993 / 19G412 Replacement with Gasket Kit and Screw Cap

The Onsnail 5-4993 carburetor is a direct-fit aftermarket replacement designed to restore fuel delivery and dependable starting on compatible Briggs & Stratton small engines.

If your mower, generator, or small tractor powered by Briggs & Stratton-style engines has been suffering from hard starts, rough idling, or poor throttle response, a worn or blocked carburetor is a common cause. This Onsnail assembly is built to match the form and function of popular Walbro/LMT-style carburetors (model groupings including 5-4993, 19G412, 690115 and related part numbers). It ships with a gasket kit and screw cap to make installation straightforward and to help ensure a good seal and consistent performance.

Which engine models and part numbers does this replace?

This carburetor is compatible with many Briggs & Stratton and Walbro LMT-style applications. It fits families identified by several common part numbers and engine model ranges used on small tractors and portable generators.

• Replaces Onsnail/Walbro-style numbers: 5-4993, LMT-162, LMT-165, LMT-166.
• Interchanges with Briggs & Stratton/OEM legacy numbers: 690115, 690111, 690119, 694526 and others listed in the features.
• Fits engine families: 19G412, 19E412 and related 192402, 192407, 192412, 192417, 192432, 192436, 192437, 19G400 series, and similar models.
• Check your engine model and existing carburetor casting numbers before purchase to confirm fit.

How will this replacement carburetor affect starting and running?

Replacing a degraded carburetor can significantly improve cold starts, throttle response and steady idling by restoring the correct air-fuel mix. The Onsnail unit is produced to consistent manufacturing standards to reduce leaks and metering errors that cause flooding or lean running.

• Improves fuel metering and mixture stability for smoother idle and acceleration.
• Reduces fuel overflow and hard-start conditions caused by sticking floats or clogged jets.
• Includes gasket kit and screw cap to ensure proper sealing and installation.

What’s included and what tools or skills are needed to install it?

The package contains one carburetor, a gasket kit, and a screw cap as pictured. Basic mechanical skills are sufficient for the swap; typical requirements include removing the air cleaner, disconnecting fuel lines, and transferring linkages or choke components.

• Included: 1x carburetor, gasket kit, screw cap—ready to mount.
• Tools: screwdrivers, socket set, pliers, and optionally a carb cleaner for mating surfaces.
• Skill level: intermediate DIY; consult engine manual for torque and linkage orientation if unsure.

Are there any important compatibility or warranty notes?

This is an aftermarket replacement part manufactured by Onsnail and is not an original Briggs & Stratton product. It aims to meet or exceed typical aftermarket tolerances, but customers should verify fitment against their engine model and parts numbers before ordering.

• Not an OEM Briggs & Stratton part; sold as an aftermarket replacement.
• Verify engine model and existing carburetor cast numbers to ensure compatibility.
• Contact Onsnail customer support by email if you have fitment or installation questions.

Who this is for: This carburetor is intended for owners, mechanics, and fleet managers who need a reliable aftermarket replacement for small Briggs & Stratton-style engines used in lawn tractors, generators, and light utility equipment. If your equipment shows symptoms like flooding, fuel leaks, poor idle, or inconsistent throttle response, and you’ve confirmed compatibility with the listed part numbers and engine models, this Onsnail assembly offers a cost-effective repair option with included gaskets to streamline the installation.