CV Backfiring
Road Warrior
Joined: Oct 2009
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keep us updated, interested to see how it works out.
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Joined: Jan 2009
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I have an '06 Street Glide, with a CV carb on it. I have Rineheart slip ons and a Screaming Eagle stage 1 intake with an Arlen Ness air filter (witch is and open element set up, open airfilter/rain sock). I have recently rebuilt and re-jeted the CV. Im getting alot of backfiring out the intake and some fuel comming back out into the bottom of my air filter. Can anyone help me on fixing these 2 problems, because no one that I have spoken with knows whats going on. Here are the specs:
46 for the pilot jet
2 1/2 turns on the air'fuel mixture screw
180 for the main jet
3rd clip positon on my needle
CVP performance slide spring (for quicker throtle response)
all new gaskets/o rings
new rubber gasket between the carb and intake manifold
Thanks for all suggestions!
46 for the pilot jet
2 1/2 turns on the air'fuel mixture screw
180 for the main jet
3rd clip positon on my needle
CVP performance slide spring (for quicker throtle response)
all new gaskets/o rings
new rubber gasket between the carb and intake manifold
Thanks for all suggestions!
My $.02 worth.
Sounds like your getting too lean when you snap the throttle open.
This could be caused by the slide opening too quick "weak slide spring" and/or the accelerator pump is too weak.
Also cam timing that closes the intake too late will cause both carb fogging and farts....
Does the Arlen Ness air filter require oil on it?
Last edited by shadylane; Mar 31, 2010 at 06:09 PM.
HDF Community Team
Joined: Dec 2005
Posts: 5,428
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From: NC USA
Not yet mentioned unless I missed it - sounds like you have a vacuum leak. That can happen at the carb grommet, either or both o-rings at the head, a torn, punctured or misaligned diaphram and seldom but it does happen, an enricher valve not seating correctly. If any of those conditions exist, you'll never tune the backfire out of it. A weak accelerator pump can do it, but that usually gives symptoms at higher RPMs also.
The lightweight check valve for the accelerator pump will often cause fuel slober because the vacuum pulls fuel by it thru the accelerator nozzle, acting like a siphon.
And please correct me if I'm mistaken, but they don't make a 46 jet for a CV. (anyone got part number?) 48 would be my suggestion as a minumum for anything bigger than a Sportster or a stock Evo.
The lightweight check valve for the accelerator pump will often cause fuel slober because the vacuum pulls fuel by it thru the accelerator nozzle, acting like a siphon.
And please correct me if I'm mistaken, but they don't make a 46 jet for a CV. (anyone got part number?) 48 would be my suggestion as a minumum for anything bigger than a Sportster or a stock Evo.
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redrott
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