HD Welch Plug for Tillotson

Welch Plug for Tillotson HD Carburetors

This Welch plug is a small press-in expansion plug that seals the internal fuel passages on Tillotson HD series carburetors to prevent leaks and air intrusion.

Overview

This Welch plug is a carburetor sealing component used to close off the drilled fuel and air passages in Tillotson HD carburetor bodies. Once pressed into place, it keeps the internal circuits sealed so fuel metering stays consistent. It is aimed at small engine rebuilders and anyone doing a carburetor service or rebuild.

Built For Performance

• Press-in expansion design seats firmly in the carburetor body
• Seals internal fuel and air passages against leaks
• Restores correct metering after a carburetor cleaning or rebuild
• Compact size suited to small engine carburetor work
• Commonly replaced as part of a full HD carburetor overhaul

On-The-Job Use

• Carburetor rebuilds on Tillotson HD series units
• Resealing after ultrasonic or solvent cleaning of the carburetor body
• Small engine repair on saws, karts, and power equipment running HD carbs
• Restoring an engine that runs lean or stalls from a leaking passage

Specs At A Glance

Good To Know

Q: Do I really need to replace the Welch plug during a rebuild? A: Welch plugs are usually removed to clean the hidden passages beneath them, so fitting a fresh plug after cleaning is standard practice. Reusing an old one risks a poor seal and fuel or air leaks.

Q: How is a Welch plug installed? A: It is pressed flat into its bore and then expanded slightly to lock and seal it against the carburetor body. Proper seating depth matters, so work carefully and match the plug size to the bore.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.