GT15HZ Carburettor Replacement Gasket OS49415000 - O.S. Engine  [OS49415000]

Why this gasket matters and how to fit it

The OS49415000 carburettor gasket from O.S. Engine is made as an exact-fit replacement for the GT15HZ carburettor mating surfaces. Its job is to maintain a leak-free junction so fuel and airflow remain consistent for reliable engine behaviour.

Functionally the gasket prevents unwanted seepage and preserves contact alignment, which supports repeatable needle settings and throttle control. Inspect gaskets during service and swap out any that show compression, cracking, or fuel staining to restore the intended sealing surface.

Fitting the gasket is a basic workshop task: detach the carburettor, separate the sections where the gasket sits, thoroughly clean both faces of old material and deposits, then position the new gasket making sure all passages line up. Tighten fasteners evenly to the correct torque to avoid body distortion that could break the seal.

A correctly seated gasket makes tuning more predictable by stabilising flow paths. If you detect fuel odor, visible leakage, or erratic idle after reassembly, re-check alignment and the condition of surrounding carburettor parts.