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24th June 2012
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Biker
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Join Date: Sep 2009
Posts: 18 Sportster/Buell Model: XL883C Sportster/Buell Year: 2003 Sportster/Buell Model #2: XL883 Other Motorcycle Model: 1995
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Quick VOES/timing question
pretty stock 883 - pipes and air filter are aftermarket
I'm trouble shooing 3/4 throttle issue and trying to verify the VOES is working properly and came across something i didn't expect:
bike is idling (a little slow), i then pulled the vacuum hose from the back of the carb (CV) and the idle immediately increased significantly, which wasn't what i expected.... i expected it to idle slower, am i wrong?
thoughts - voes issue or timing?
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24th June 2012
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Jester Mafia
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Join Date: Jan 2008
Location: So Cal
Posts: 8,854 Sportster/Buell Model: XL1200C Sportster/Buell Year: 2006 Sportster/Buell Model #2: XL1200C Sportster/Buell Year #2: 2006 Other Motorcycle Model: 48 Other Motorcycle Year: 2012
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That was a vacuum leak !
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24th June 2012
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XL FORUM TEAM MEMBER
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Join Date: May 2011
Location: Irwin, Pennsylvania
Posts: 4,942 Sportster/Buell Model: Hammer 1250 Hugger Sportster/Buell Year: 1997
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Quote:
Originally Posted by rocketmangb
That was a vacuum leak!
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That's exactly what you were creating when you removed the hose. But, by putting if back on the fitting you will hear the change in RPMs that you are looking for to verify proper VOES operation.
If yopu look in the FSM they also go through the process of testing the VOES with a vacume pump. This is really a better test. as you can see how much vacume is required to open and close the switch.
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25th June 2012
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Custom Bike Builder
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Join Date: Jul 2008
Posts: 2,249 Sportster/Buell Model: 1200s Sportster/Buell Year: 2001 Sportster/Buell Model #2: xlch Sportster/Buell Year #2: 1974
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vacuum test is the best way to find switch point and on a stocker, probably around 10 -12 inches. another simple test is to install a 12v bulb and socket between the voes ground wire and ground, other words, current must pass through the voes and then the bulb before ground. light on, voes activated and visa-versa.
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