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Last Post: madnss
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21st May 2013
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Senior Master Custom Bike Builder
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Join Date: May 2011
Location: Corona, California
Posts: 6,841 Sportster/Buell Model: 1250 Hammer Hugger Sportster/Buell Year: 1997
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Vacume Petcock Question
If I remove the hose from the vacume inlet of my petcock and hook up a Mityvac and pump it to create a vacume, should it hold the vacume I created?
When I do it to mine, it will pull a few HG's on the gauge but it quickly bleeds off.
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21st May 2013
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Senior Custom Bike Builder
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Join Date: Jan 2011
Location: South Western Ontario
Posts: 2,903 Sportster/Buell Model: Dearly Departed XL1200C Sportster/Buell Year: 2005 Other Motorcycle Model: FXDL Low Rider Other Motorcycle Year: 2000
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According to the test procedure in the '06 manual, it should hold a vacuum... you are supposed to "check for slow leaks"
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21st May 2013
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XL FORUM TEAM MEMBER
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Join Date: Jan 2008
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GMAN !
I dont know how sensitive the VOES is but if its TEE'D to the petcock you have 2 issues.
Just my .02
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21st May 2013
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XL FORUM TEAM MEMBER
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Join Date: Nov 2005
Location: North cental Ohio
Posts: 2,399 Sportster/Buell Model: XL1200C Sportster/Buell Year: 2009 Sportster/Buell Model #2: XL1200L Sportster/Buell Year #2: 2009
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IIRC, you can disassemble the petcock & reverse the spring/diaphram assembly, to allow the petcock to flow without vacuum. I don't know whether that will affect the VOES thingy, tho.
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21st May 2013
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XL FORUM LIFE MEMBER
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Join Date: Nov 2004
Location: Long Island, NY
Posts: 4,958 Sportster/Buell Model: XL1250c Sportster/Buell Year: 2002
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Quote:
Originally Posted by BKB
IIRC, you can disassemble the petcock & reverse the spring/diaphram assembly, to allow the petcock to flow without vacuum. I don't know whether that will affect the VOES thingy, tho.
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If you go that route you can cap off the vacume line at the petcock and run a single hose to the voes from the carb or just cap off the T also.
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21st May 2013
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Senior Master Custom Bike Builder
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Join Date: May 2011
Location: Corona, California
Posts: 6,841 Sportster/Buell Model: 1250 Hammer Hugger Sportster/Buell Year: 1997
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All great replies and thank you. I think I'll check to see if they make a rebuild kit for the petcock first.
And yes, I agree that if I'm leaking vacume at the petcock it would be affecting my Voes.
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22nd May 2013
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Senior Master Custom Bike Builder
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Join Date: May 2011
Location: Corona, California
Posts: 6,841 Sportster/Buell Model: 1250 Hammer Hugger Sportster/Buell Year: 1997
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Picked up a new petcock at the dealer today.
The hook up for the vacume line does seal tight on the new one.
Since the original one on my bike leaks air that means that I've been trying to tune the carb with what amounts to a vacume leak.
As Rocketmangb said, the VOES is on the same vacume line, so my VOES would be ineffective in controlling my timing.
Time to drain the tank and change the petcock.
BTW a new factory petcock is only $45.00 and comes with the gasket and new filter.
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22nd May 2013
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Senior Master Custom Bike Builder
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Join Date: Apr 2012
Posts: 14,004 Sportster/Buell Model: 1200S Sportster/Buell Year: 2002 Sportster/Buell Model #2: XLH883 Sportster/Buell Year #2: 2003
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Quote:
Originally Posted by Gcram399
Picked up a new petcock at the dealer today.
The hook up for the vacume line does seal tight on the new one. ...
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Is the vacuum hose simply expanded? |
22nd May 2013
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Senior Master Custom Bike Builder
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Join Date: May 2011
Location: Corona, California
Posts: 6,841 Sportster/Buell Model: 1250 Hammer Hugger Sportster/Buell Year: 1997
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Quote:
Originally Posted by sportsterdoc
Is the vacuum hose simply expanded?
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No, sorry I miss worded that. The line fits tight, the diaphram must be torn.
When I tested the diaphram I removed the vacume line from the petcock and hooked up the line from my Mityvac. When I couldn't pull and hold a vacume on the diaphram I determined it to be bad. |
22nd May 2013
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XL FORUM LIFE MEMBER
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Join Date: Nov 2004
Location: Long Island, NY
Posts: 4,958 Sportster/Buell Model: XL1250c Sportster/Buell Year: 2002
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Keep the screws from the old petcock. You may need them one day. I had 3 out of 4 of my screws come out on the way home from laconia one year. Was driving down the highway and all of a sudden felt my knee getting wet. I put my hand in the liquid and smelled it and realized it was gas pouring out of the left side of my tank and i have side mounted coils as well. Thank god nothing went bad. I pulled over and realized my petcock was leaking gas. I put a small ziptie in each hole and that held it together u til i got home and bought a new one. My indy told me i was the first person he has heard that happen to.
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