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Jonesz
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« on: June 29, 2018, 08:57:29 AM » |
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A bit of history on the bike. Last fall I did the Dan Marc fuel shut-off install. While the airbox was out decided to do a Desmog but rather than get a kit etc. and do the complete removal went the cheap route and merely removed the PAIR valve and sealed the pipe ends with short pieces of hose with a plug installed. We had done this on a friends 2000 I/S with no ill effects. After reassembling mine it was noted that the bike had now had a popping in the exhaust (left side) when revved in neutral and held at anywhere above 1500 RPM. I also at that time converted my OEM petcock to manual operation no longer requiring vacuum so removed vacuum lines and used caps to seal the intakes. In comparing the two bikes yesterday it was noted that his still had 3 vacuum lines. He is still using the oem petcock. I am now wondering if I screwed something up as all 6 of my intakes have capped vacuum ports.
Recently my bike has also developed a sputtering miss when I accelerate particularly in lower gears from launch. This miss seems to disappear as the RPM's increase in each gear range. Have tried different grades of fuel, Seafoam etc with no change. At highway speeds in 4th or 5th there doesn't seem to be any problem. This AM I checked the plugs and the only difference noted was grey look to the plug from the #2 cyl. All other plugs looked normal. That is also the exhaust side that seems to pop when revved in neutral as noted above. I have two mechanic friends who are wondering if I have a lean situation and this is contributing to the popping and miss situation. Sorry for the long post but tried to describe my problem as best as possible. Any ideas or help greatly appreciated.
Jonesz
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Avanti
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« Reply #1 on: June 29, 2018, 10:50:17 AM » |
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Have you checked all the intake O-rings to make sure they are properly sealed. Also need to make sure the intake boots are not leaking air between the air box and carburetors. I would also check air box for leaks. Are the plugs sealed well that you used for the Desmond?
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Jonesz
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« Reply #2 on: June 29, 2018, 11:32:49 AM » |
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Checked the boots to air box with a mirror they look like they were installed OK and re-tightened the clamps. Will do some more looking, maybe take off the vacuum cap on # 2 and try another. Going to try a compression test this aft and maybe check the mixture screw starting with #2.
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flash2002
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« Reply #3 on: June 29, 2018, 12:09:52 PM » |
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The sputtering at low speed sounds like the carbs are a bit out of sink. Mine did that to until I adjusted the carbs.
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Ricky-D
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« Reply #4 on: June 29, 2018, 03:57:28 PM » |
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You fail to mention what you did with the vacuum hose that were connected to the pair valves.
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2000_Valkyrie_Interstate
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Jonesz
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« Reply #5 on: June 29, 2018, 05:06:09 PM » |
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Ricky D I am thinking that the vacuum line that went to the PAIR valve was plugged. We took the airbox out today and rechecked the plugs that were put in to seal off the PAIR pipes after the removal. They look good. We did a compression test and all cylinders were with a lb or two of being the same. Took off the carb tops to check the diaphrams and no problems there. Tomorrow next on the agenda is to do the valve adjustments.
I am guessing many have been here but the next step would be to remove the carbs to check for block in a slow speed jet. Hate to do this as the carbs look really clean inside after checking diaphrams etc. Is it better to do the carbs out of the bike or flipped over in the bike as some have suggested. Thinking better to pull the carbs rather than removing the rad etc.Also wondering how best to remove the plugs covering the pilot screws. Would like to get in there without having to pull the whole carb set-up.
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sandy
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« Reply #6 on: June 29, 2018, 05:32:06 PM » |
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Many have had problems with the Dan-Marc valve install. If the fuel line isn't level, flow can be restricted. The #2 carb is farthest from the petcock which would be the first to show the effects.
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Jonesz
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« Reply #7 on: June 29, 2018, 06:31:06 PM » |
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Sandy will check that out toorrow
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Crackerborn
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« Reply #8 on: June 30, 2018, 04:56:50 PM » |
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I am thinking vacuum leak. While the Girl is running, use propane or similar around the carbs (gas not flame). If the rpms pick up while the gas is being sprayed near a vacuum line, replace that line. Or cap since de-smogged. Any loose boot or o-ring will also raise the rpm when sprayed. Make sure you don't have a CA Girl, they have more vacuum lines than the 49 state models.
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Life is about the ride, not the destination. 97 Valkyrie Tour 99 Valkyrie Interstate  |
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Jonesz
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« Reply #9 on: July 01, 2018, 02:34:50 PM » |
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Hi all. Well no joy in tracing down the problem so far. Yesterday afternoon we tried adjusting the Dan Marc install up/down etc and the popping was still there. Pulled the plugs out of the the two pipes leading to the PAIR valve hoses and the popping virtually went away. Plugged them again and popping returned?
We did the propane bottle trick prior to that and there was no change in RPM that we could detect. The bike was needed for tomorrow AM so being at a loss decided to reinstall the PAIR valve. The popping is almost gone and will see how it performs tomorrow on a morning ride regarding the miss/stumble at lower speeds. BTW almost took the Dan Marc out too as it together with a fuel filter made it very difficult to reinstall the PAIR and still have clearance to hook the fuel line to the petrcock. BTW would love to get a hold of the engineer who designed the rubber boots from the airbox to the carbs. Thanx for the suggestions so far
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The emperor has no clothes
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« Reply #10 on: July 01, 2018, 04:17:09 PM » |
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Hi all. Well no joy in tracing down the problem so far. Yesterday afternoon we tried adjusting the Dan Marc install up/down etc and the popping was still there. Pulled the plugs out of the the two pipes leading to the PAIR valve hoses and the popping virtually went away. Plugged them again and popping returned?
We did the propane bottle trick prior to that and there was no change in RPM that we could detect. The bike was needed for tomorrow AM so being at a loss decided to reinstall the PAIR valve. The popping is almost gone and will see how it performs tomorrow on a morning ride regarding the miss/stumble at lower speeds. BTW almost took the Dan Marc out too as it together with a fuel filter made it very difficult to reinstall the PAIR and still have clearance to hook the fuel line to the petrcock. BTW would love to get a hold of the engineer who designed the rubber boots from the airbox to the carbs. Thanx for the suggestions so far
In my opinion, there is nothing wrong with leaving the smog stuff. Just be aware the hoses will be vulnerable. It makes for a cleaner look without the stuff IMHO. I thought about adding a filter also when I installed the DanMarc. But many have had issues and I didn't. Next time you reinstall the air box, try a 2x4 and a ratchet strap. |
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Jonesz
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« Reply #11 on: July 01, 2018, 04:38:26 PM » |
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[/quote]In my opinion, there is nothing wrong with leaving the smog stuff. Just be aware the hoses will be vulnerable. It makes for a cleaner look without the stuff IMHO. I thought about adding a filter also when I installed the DanMarc. But many have had issues and I didn't. Next time you reinstall the air box, try a 2x4 and a ratchet strap.
[/quote]
I may delete the fuel filter next time I am in there, would provide a lot more room for the petcock hookup. The air box reinstall method will be tried. Would save needing 5 hands. Thanx for that.
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The emperor has no clothes
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« Reply #12 on: July 01, 2018, 05:03:33 PM » |
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In my opinion, there is nothing wrong with leaving the smog stuff. Just be aware the hoses will be vulnerable. It makes for a cleaner look without the stuff IMHO. I thought about adding a filter also when I installed the DanMarc. But many have had issues and I didn't. Next time you reinstall the air box, try a 2x4 and a ratchet strap. [/quote] I may delete the fuel filter next time I am in there, would provide a lot more room for the petcock hookup. The air box reinstall method will be tried. Would save needing 5 hands. Thanx for that. [/quote]I can't take credit for it. I read about somebody doing it. It works great ! |
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