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dpcarson
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« on: March 21, 2015, 10:40:23 AM » |
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I am getting a little skip and sputter/pop on the right side. Carbs are synced. Can anybody give me an idea of what this might be? Vacuum leak? too rich? too lean? any ideas?
Update. Pulled all intake and boots on right side last night and can't find any potential vacuum issues. However, Today I pulled the exhaust tips off and the piggies have been cut off, but from the shop talk pages, that should not have created any difference. Or did it? |
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« Last Edit: March 22, 2015, 07:19:14 AM by dpcarson »
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"""""""""""""""""""""""""""""" In war, there are no unwounded soldiers.  |
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KG
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« Reply #1 on: March 21, 2015, 11:44:37 AM » |
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does it do it running at speed or just on acceleration or coasting/deceleration?
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What we do all have is a limited number of days to devote to whatever we love in this life. Not all the same number of days but all have limited days....Willow
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rugguy
Member
Posts: 245
2000 Valk I/S
Atlanta, GA
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« Reply #2 on: March 21, 2015, 11:51:34 AM » |
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intake "O" ring(s)....
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I hate sand....sand SUCKS!
I wear a helmet....."I'd rather have brains in my head than wind in my hair"
1999 Valk I/S
2000 Valk I/S
2001 BMW K1200 LTE (sold)
2002 FLHRSEI (for sale)
2006 FLHCTUI (sold)
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dpcarson
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« Reply #3 on: March 21, 2015, 12:21:09 PM » |
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Does not do it at all during medium or hard acceleration. Does it at low rpm's mainly or when coming downhill when there is no load. Intake o-rings were just replaced when i put the bike back together, but I guess that is no guarantee that there is not a leak somewhere. Does not do it during an acceleration or increased throttle but mainly during a steady throttle situation.
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"""""""""""""""""""""""""""""" In war, there are no unwounded soldiers. |
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BonS
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« Reply #4 on: March 21, 2015, 01:46:20 PM » |
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Likely an air leak from somewhere. I'd get the dental mirror and flashlight out and inspect all around each carburetor rubber boot. Also make sure all the bands are tight as well. One other suspect might be a pinhole or tear in a diaphragm of a carburetor vacuum piston or vacuum port plug (since you just did a sync job). I like to check the diaphragms in sunlight where I can see through any tiny imperfection.
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sandy
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« Reply #5 on: March 21, 2015, 02:26:32 PM » |
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Can also be the vacuum lines. Tighten all the bands on the air cleaner housing down to the carbs. Check tightness on the exhaust flanges. Don't overtighten them.
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dpcarson
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« Reply #6 on: March 21, 2015, 03:37:15 PM » |
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Sounds like everybody is pretty much in agreement that it sounds like a vacuum leak somewhere. Well, I guess I can always tear it all back apart on the right side and just re-check everything. Thanks guys.
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"""""""""""""""""""""""""""""" In war, there are no unwounded soldiers. |
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Pete
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« Reply #7 on: March 21, 2015, 04:38:20 PM » |
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Small hole in the carb piston skirt??
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dpcarson
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« Reply #8 on: March 21, 2015, 05:20:47 PM » |
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"""""""""""""""""""""""""""""" In war, there are no unwounded soldiers. |
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Chrisj CMA
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« Reply #9 on: March 21, 2015, 08:02:12 PM » |
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If you have never tightened the 18 screws holding the clamps to the six intake runners you will be surprised how loose they are. If that doesn't fix it, look closely at the caps on the non used nipples on the intakes and the three primary vacuum lines (two to center carbs and one to the petcock)
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dpcarson
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« Reply #10 on: March 22, 2015, 05:11:21 AM » |
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OK, went back last night and all runner and boot clamps are tight. Manifold O rings are all in good shape and they were all re-torqued to specs. Vacuum to petcock was goo. Rechecked all vacuum caps on manifold nipples when pulled manifolds. I am trying very hard to figure this out without pulling the carbs out again.
Any diagnostic procedure or tool that could at least determine which cylinder it is...... assuming it is only one cylinder.
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"""""""""""""""""""""""""""""" In war, there are no unwounded soldiers. |
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Ricky-D
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« Reply #11 on: March 22, 2015, 09:15:12 AM » |
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Does not do it at all during medium or hard acceleration. Does it at low rpm's mainly or when coming downhill when there is no load. Intake o-rings were just replaced when i put the bike back together, but I guess that is no guarantee that there is not a leak somewhere. Does not do it during an acceleration or increased throttle but mainly during a steady throttle situation.
Under the circumstances you describe, the synchronization should be suspect. *** |
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2000_Valkyrie_Interstate
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dpcarson
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« Reply #12 on: March 22, 2015, 09:21:11 AM » |
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Does not do it at all during medium or hard acceleration. Does it at low rpm's mainly or when coming downhill when there is no load. Intake o-rings were just replaced when i put the bike back together, but I guess that is no guarantee that there is not a leak somewhere. Does not do it during an acceleration or increased throttle but mainly during a steady throttle situation.
Under the circumstances you describe, the synchronization should be suspect. *** I will go back through and look up the carb sync do-hicky again tonight and double check those numbers. Maybe set the rpm's at about 2000 and sync at that point? |
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"""""""""""""""""""""""""""""" In war, there are no unwounded soldiers. |
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Chrisj CMA
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« Reply #13 on: March 22, 2015, 09:24:19 AM » |
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Also go back and check all the rubber tubes that connect the carbs to the airbox. Its easy to get a couple not all the way on. Use a small mirror on a pole thingy.
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longrider
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« Reply #14 on: March 22, 2015, 09:46:58 AM » |
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It could be many things but I had a similar problem and I changed plugs and it was gone
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dpcarson
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« Reply #15 on: March 22, 2015, 09:47:25 AM » |
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Also go back and check all the rubber tubes that connect the carbs to the airbox. Its easy to get a couple not all the way on. Use a small mirror on a pole thingy.
Checked all of those last night. Everything was seated well. |
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"""""""""""""""""""""""""""""" In war, there are no unwounded soldiers. |
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dpcarson
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« Reply #16 on: March 22, 2015, 09:48:04 AM » |
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It could be many things but I had a similar problem and I changed plugs and it was gone
Noted. New plugs coming this afternoon. It would be great if it was something this simple. |
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"""""""""""""""""""""""""""""" In war, there are no unwounded soldiers. |
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Ricky-D
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« Reply #17 on: March 23, 2015, 08:22:12 AM » |
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To think that doing a synchronization at 2000rpms is going to get the correct
results, is misplaced. Follow the directions in the manual. Continue to adjust
the idle to be at the same engine speed while doing the synchronization. The
directions in the manual are very specific. The idea that shortcuts will yield
satisfactory results is folly.
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2000_Valkyrie_Interstate
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