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Join Date: Nov 2007
Location: Chandler, Arizona
The crankcase is vented from the front head to the front part of the surge tank. There is no PVC system like on a car. I don't know why motorcycles never used that system. There is a lot more vacuum coming from the manifold than what little is in the surge tank. My '85 Goldwing was designed the same way, only a lot more complicated. There were 18 separate parts in the crankcase venting system. When I got done with it there was one, a piece of heater hose connected to the vent fitting on top of the engine, and ran across the top of the engine to the other side, and down under the bike. The aforementioned "road draft tube"
I am a motorcyclist, NOT a biker.
1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike