BP6ES means that the plug has a Projecting tip - it sticks down into the
combustion chamber a bit farther. If you compare a B6ES with the BP6ES you
can clearly see it.
Otherwise, the heat range being the important thing, they're the same. My
serious motor experience is with 2 strokes, and there the tip shape mattered
a little based on the squish shape, etc., but it shouldn't matter with these
engines.
Fred J.
WI
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