tank venting, sooprise!!

Art Lischer alisch80 at mchsi.com
Tue Aug 7 18:52:38 PDT 2007

More than likely the carb bowl vent tube ends are in a spot where air is
rushing by and not allow in the bowls to vent properly.  Atmospheric air
pressure must be able to equalize with the space above the fuel level in
the bowls or fuel will not flow.

Moving your knees created a different air flow pattern around the bike.
Move the tube ends to a place that is not subject to air movement.
Problem should go away.
Art in DM

Larry Zoia wrote:
> <snip>
> Now, after a couple of hours is when I start shifting positions, 
> pulling my knees away from the tank and such.
> I found that when I put my knees back against the tank, the bike 
> smoothed out.  When I moved them away (again
> at about 85 mph) it started to cut out again.  I tested this
> repeatedly over a straight stretch at a steady speed, and
> the results were unmistakable.  When I spread my legs,
> the bike seem fuel starved.
> I theorized that at high speeds, air flowing by the outboard pods 
> created a sort of siphon effect and starved
> the carbs of air/fuel.
> Larry in Michigan

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