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Roidfingers
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« on: February 15, 2017, 02:06:30 PM » |
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I had pulled my carbs several months back . Cleaned and installed new air/fuel mixture screws. Along with interstate springs and installed new idle jets to 38's. I think. Well never really could get it just right so I decided last month to got back to the 35's jets and now it seems to be doing much better. I was having a problem with running to rich. Couldn't get it right after many adjustments.
So I have the 35's back in and I'm not smelling fuel or any smoke from pipes. That's good. Seems to be idling fine as far as left side goes but on the right its popping a little especially #5. I have cobras 6 into 6 and no baffles. Have mixture screws at 2 turns out on all 6.
Any thoughts. Gonna get Big BF over here as soon as possible but that wont be till summer sometime.
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Blackduck
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« Reply #1 on: February 15, 2017, 02:36:33 PM » |
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Have you checked the exhaust header studs? Exhaust leak can cause that.
Also don't be afraid to crank 1 mixture in a bit more than the others.
Cheers Steve
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2001 Standard, 78 Goldwing, VRCC 21411
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Bighead
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« Reply #2 on: February 15, 2017, 04:33:20 PM » |
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My first question is WHY did you pull the carbs? was it running bad? if not there is your problem you F"D with something that didn't need anything.
these bikes were made to ride not tinker on. put it back to stock and RIDE it. well over 100k and guess what my carbs have NEVER I repeat NEVER been touched.
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1997 Bumble Bee
1999 Interstate (sold)
2016 Wing
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Hook#3287
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« Reply #3 on: February 15, 2017, 04:54:42 PM » |
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New intake o-rings? I'd inspect #5's. Try spraying a little engine starter fluid around the base of the intakes while idling. If the rpm's increase, you've got a leak. Inspect the air box boots that they are all in the correct position and tight.
How about the boost caps? Are they all there and in good condition? Are your rubber vacuum hoses all in good shape?
Carb's synced?
I've swapped the 35's out for 38's on 6 Valkyries and all of them are running excellent. And they don't get plugged up with crappy corn gas.
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Roidfingers
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« Reply #4 on: February 15, 2017, 06:12:18 PM » |
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Well Bighead, I had pulled my baffles from the 6 into 6 and it was running rich. So tried to lean it out. That's why. If you had read the OP. Yes I have checked the intake orings. I have about 20 on hand and if they at all look bad, I change them. All air is tight. Gonna try to do the propane bottle ttrick to check for leaks. Spray didn't indicate anything.. All issues are the right side. Left is very smooth.
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Buza
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« Reply #5 on: February 15, 2017, 10:49:58 PM » |
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If it's out of sync much it can cause popping on some cylinders, even on just one. Happened to me and problem got solved once resynchronized.
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Roidfingers
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« Reply #6 on: February 16, 2017, 07:33:37 AM » |
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I have a digi sync and have sync them. Could a coil be going bad? Not sure bout those. Haven't done much research on them.
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falconbrother
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« Reply #7 on: February 16, 2017, 10:36:59 AM » |
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These kinds of things can be a bear to diagnose with all these carbs. I have done Harleys too much but, haven't fooled with the valk yet--and don't wish too. Low RPM popping sounds like a lean condition and or an intake leak.
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Ricky-D
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« Reply #8 on: February 16, 2017, 11:08:02 AM » |
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I would suggest to check the air cut valve on the carburetor at the cylinder which is causing you the problem.
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2000_Valkyrie_Interstate
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Roidfingers
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« Reply #9 on: February 16, 2017, 03:38:21 PM » |
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Ricky -D, How do you check those? Also I'm getting what sounds like a little shot of air or something from around number 5 carb. Like a puft, puft, puft. Increases with excellaration. Not loud. But never heard before. Pulled the cap off top of carb, thinking maybe the spring was in bind but no. ????? Any thoughts?
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Hook#3287
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« Reply #10 on: February 16, 2017, 05:49:03 PM » |
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http://www.partzilla.com/parts/search/Honda/Motorcycle/1998/GL1500C+A/CARBURETOR+COMPONENTS/parts.html#24, Unfortunately, I believe the only way you can inspect the valve is to remove it and the only way to get at it, is to pull the carbs. You can check the vacuum hose attached to it for cracks, but replacing that will be a bear W/O pulling the carbs. Maybe get one of those long nosed gas grill lighters set on low and see if you can tell where that "Puft" is coming from. Should move or put out the flame. UPDATE++++++++++ I just checked it out and it looks like if you want to inspect the air cut off valve on #5, you could remove the front carb mounting plate and move it forward enough to get at the valve. Just speculation, but looks like it would work for #5 only.
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« Last Edit: February 16, 2017, 06:09:52 PM by Hook#3287 »
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Hook#3287
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« Reply #11 on: February 16, 2017, 06:06:03 PM » |
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I have a digi sync and have sync them. Could a coil be going bad? Not sure bout those. Haven't done much research on them.
Each coil fires two plugs, #5 is paired with #6, so you'd have the same issue on both. Sounds like carb issue. |
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Ricky-D
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« Reply #12 on: February 17, 2017, 08:17:57 AM » |
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Make a stethoscope with a piece of hose and with that you can narrow down exactly from where the puff puff sound is emitting.
I feel that normally a problem from the air cut valve would be a hose that has deteriorated to the point where it is leaking. So that is what I would look at first.
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2000_Valkyrie_Interstate
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Roidfingers
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« Reply #13 on: February 17, 2017, 08:35:03 AM » |
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Thanks all for the input. Another issue I found is when I was syncing the carbs and blipping the throttle, the rpms would hang a little even when throttle snaps back and is fully closed. Could this also be linked to air cut valve?
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