tank venting, sooprise!!
phezanthawk at wowway.com
Tue Aug 7 16:44:56 PDT 2007
Perhaps you'll remember the thread I started a while
back about the GPZ cutting out at high speeds. I tested
the gas flow with and without the inline filter and discovered that I got
about ten times the flow without
the filter. The bike has the Factory Pro Stage III kit
and K&N pod filters.
Some incidental riding and testing showed no problems.
Last weekend I went on a trip to Indian River, Michigan.
Once again, about two hours into the ride and at about
85 mph the bike starts cutting out again.
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.
But how is it that many on this list run the same carb configuration with no
problems? The answer just struck
me out in the garage. I run the bike without the lowers so
that I can use highway pegs, and this allows air flow across the carbs.
Larry in Michigan
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