WLA-2 GT55 Carburetor Insulator OS29781110 for O.S. Engine  [OS29781110]

Thermal Isolation Insulater

This O.S. Engine OS29781110 carburetor insulater is an RC-scale carburetor accessory intended to sit between the carburettor and the engine backplate to reduce heat transfer and help maintain more consistent fuel metering during tuning.

In practical terms the insulater's role is to add thermal isolation and a controlled gap that can influence idle stability and mid-range response when tuning nitro engines. It does not alter carburettor geometry, instead it helps protect the carburettor from direct crankcase heat and reduces vaporisation-related idle issues common in prolonged runs.

Installation is straightforward for people familiar with engine service: remove the carburettor, clear mating surfaces of old gasket material and dirt, fit the insulater between carburettor and backplate, and retighten mounting screws evenly to avoid distorting the carb body. Check for air leaks at the mating faces after installation and perform a basic tune to confirm idle and needle settings remain consistent.

Notes on tuning: expect small shifts in idle and needle behavior after adding or removing an insulater, so re-check low-speed needle settings and idle mixture during a warm-up run. For maintenance, inspect the mating surfaces and fasteners periodically and replace any gaskets or O-rings that show wear.

Use this insulater where thermal isolation of the carburettor is required during tuning and regular running of nitro RC engines, and verify sealing and needle settings after fitting.