View single post by Jim Ketcham
 Posted: 02-12-2008 03:33 am
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Jim Ketcham

 

Joined: 03-13-2005
Location: Salt Point, New York USA
Posts: 208
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 The crankcase ventilation hose connects to the back bottom of the airbox.  The oil vapors condense there and then flow back down the same hose back to the crankcase.  Vapor light ends, such as fuel vapors, are sucked into the carbs and burned.  It is important the hose is connected to the back bottom so the condensate can flow back out.

Many JH's are now missing the air box.  Unfortunately, hooking the hose to the back of the aftermarket air cleaner does not allow the oil vapors to condense and flow back.  Usually, they condense and drip out the air cleaner.  Some owners have fabricated a small reservoir (from a can) and attach the hose to a fitting in the bottom to accomplish what the missing airbox used to do.  The reservoir should also be vented to the air cleaner from a fitting near the top so that the "light end" vapors can be sucked into the carbs.

I believe you can find pictures of this makeshift setup in the JHP Photo Gallery.