Review on NGK BM4A SOLID Standard Spark by Ismael Hennigan
Fits old Honda HR17 lawnmowers
The additional P/N (4000) is important as there is another connector with the same BM4A. The other spark plug has a longer insulator and should not be confused with the 4000 as it can damage the engine piston. The NGK website contains detailed P/N lists for all engine and lawnmower models.
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