I HAVE NO IDEA!

It's Motorhead Sunday and today I share an old two-wheeler I came across at the Sheboygan Marsh last summer.  It was sitting there among a passel of old H-Ds while the riders were having a cholesterol filled breakfast at the Marsh Lodge.
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I made a few photos while I waited to see if the riders would make an appearance but they just kept on eating and I didn't wish to disturb their meal....so I never found out what the bike actually is.  But I'm fairly certain that the rider has burned his leg on those exhaust ports occasionally.  Surely it gets pretty hot.
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Any antique motorcycle gear heads out there who have an idea what it might possibly be?
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BEST IN LARGE.