carb rebuild issue
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Joined: Feb 2013
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From: New Lisbon Wi
carb rebuild issue
Hope some one can help. I rebuilt my carburetor using CV products deluxe tuner kit and the EZ idle screw. I have a 1993 heritage. It has Sampson long shot exhaust and an Arlen Ness big sucker air cleaner. I installed #46 idle jet and #185 main jet. I replaced the slide as this carburetor was re-jetted before and the slide vacuum hole was drilled out larger than the 7/64th diameter. The engine idles and runs fine with no popping or back fire. The issue is that it has poor acceleration. It has less acceleration then before the rebuild. I have adjusted the idle mixture screw in all the way and it still runs. I have read the CV products tuning page which was not much help. Any suggestions would be appreciated.
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Joined: Feb 2013
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From: New Lisbon Wi
It sounds like it. I had it up to 4 gear and 50 mph. The throttle is responsive when its idling and I crack the throttle. It's only when I ride it that it has poor acceleration. I'm reading the manual and it lists throttle cables miss-aligned. I checked that and it appears it opens all the way. I found no vacuum leaks. I'm guessing its internal. Does anyone know if I close the idle mixture screw all the way in if the engine should die. It doesn't. I'm wondering if the main jet is too large.
Road Warrior
Joined: Jul 2012
Posts: 1,566
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From: Londonderry, NH
Hope some one can help. I rebuilt my carburetor using CV products deluxe tuner kit and the EZ idle screw. I have a 1993 heritage. It has Sampson long shot exhaust and an Arlen Ness big sucker air cleaner. I installed #46 idle jet and #185 main jet. I replaced the slide as this carburetor was re-jetted before and the slide vacuum hole was drilled out larger than the 7/64th diameter. The engine idles and runs fine with no popping or back fire. The issue is that it has poor acceleration. It has less acceleration then before the rebuild. I have adjusted the idle mixture screw in all the way and it still runs. I have read the CV products tuning page which was not much help. Any suggestions would be appreciated.
45 slow and 170/175 main should be about right for an Evo.
What needle are you using, and is the needle jet correctly positioned? People sometimes reverse the needle jet, causing similar symptoms.
From CVP's Tuning section:
Check that the Needle Jet (nozzle) is installed correctly. Installing the jet upside down will adversely impact the fuel spray and needle metering.
Last edited by nhrider1; Mar 10, 2015 at 07:35 AM.
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From: Honah Lee
What was the main jet before you went in? If you can adjust the idle screw all the way in and it still idles, obviously you are into to the throttle for air (least on a normal carb).
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Joined: Feb 2013
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From: New Lisbon Wi
Ha ! I found the slide is not operating. OK have to take it back off and figure out why. Its a new slide, made sure it was seated correctly. The carburetor had been re-jetted before so I don't know the size. The slide vacuum port was drilled out larger than the 7/64th CV recommends. That's why I replaced it. So any suggestions where to look? Thanks all.........
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Road Warrior
Joined: Jul 2012
Posts: 1,566
Likes: 55
From: Londonderry, NH
Ha ! I found the slide is not operating. OK have to take it back off and figure out why. Its a new slide, made sure it was seated correctly. The carburetor had been re-jetted before so I don't know the size. The slide vacuum port was drilled out larger than the 7/64th CV recommends. That's why I replaced it. So any suggestions where to look? Thanks all.........
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Stellar HDF Member
Joined: Jul 2011
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From: Boston, MA
That is hardy rubber so I'm not guessing a tear but you have it slightly crimped, askew or folded and it is not making a quality seal at the top. Some asshat did this to my cv on the road glide. Btw, I'm the only guy that works on this bike.
Doh.
Doh.
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