The O.S. Engine OS71653400 LC4 long-reach glow plug is intended for model nitro engines that require extended thread engagement. The medium-hot heat grade offers a compromise between cold and hot plugs for a variety of operating conditions.
To install on compatible heads, remove the old plug with the correct glow-plug socket, ensure the threads engage properly, and tighten to the recommended feel from the engine manufacturer to avoid damage. Consider the plug a replaceable tuning item used to adjust warm-up and idle rather than a permanent performance modifier.
Match the LC4 medium-hot plug choice to ambient temperature, fuel composition, and any recent engine issues such as hard starting or inconsistent idling. Alter heat ratings incrementally when testing to identify the best ignition temperature for your setup.
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