This NGK BMR7A plug, supplied as Zenoah part K369990569, is an aftermarket ignition spare for selected Zenoah small two-stroke engines. The NGK BMR7A marking denotes the electrode layout used for predictable spark and timing behavior.
Fitting is straightforward: remove the old plug with the proper socket, inspect the thread and porcelain, hand-thread the new plug to avoid cross-threading, then tighten until snug but not over-torqued. Verify ignition and idle settings after installation.
In tuning workflows the plug acts as a quick diagnostic; monitor electrode condition and replace when erosion or heavy deposits affect spark quality, then re-check carburetor mixture and idle adjustments.
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