O.S. Engine OS29781110 Insulater for WLA-2 GT55 Carburettor  [OS29781110]

Insulater Purpose Explained

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.

The component provides a thermal barrier that reduces direct crankcase heat reaching the carburettor, which can help limit fuel vaporisation and improve idle stability during extended running or hot ambient conditions.

To fit the insulater: remove the carburettor, clean the mating faces thoroughly, place the insulater between the backplate and carb body, then refit and tighten screws evenly to avoid distorting the carb. After fitting, check for air leaks at the joint and perform a tuning check to ensure idle and needle settings are correct.

Note on tuning: small changes to low-speed mixture and idle are normal after fitting or removing an insulater. Run the engine warm and make incremental needle adjustments; inspect seals and fixings regularly for wear.

Use where thermal isolation of the carburettor is required during tuning and regular running; always confirm sealing and needle settings after installation.