Since the "s" was added on both other references it's likely a typo. Ads might not show for a couple of weeks depending on lead time for that magazine.
HD is well known for it's attempts to guard it's image I also seriously doubt they are selling their engines to this or any other company. But is it possible that HD might choose to use excess capacity to produce engines for another manufacturer? You would be amazed at how often that happens. and how often neither side will admit to it.
Don't know if I'm right or wrong here. Do your own DD, Never...EVER trust what you read on a message board.
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