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Georgia_Dave
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« on: October 05, 2014, 07:07:29 PM » |
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Ok here goes. I bought a 97 standard back in June that has 21K miles. I've had the very common rough idle issue and I tried fuel system cleaning with a few different products. I still had rough idle, a couple of pipes cool at low RPM, that whole bit so I decided to try something else. I took the outer covers off each carb and inside was a rubber thing with a spring holding it. I took that out and one at a time I sprayed carb and choke cleaner in each one. I did it while the bike idled so I could hear if it bogged down.
So good news is my idle smoothed out. The bad news is it runs very rough between 3,000 and 4,000 RPM. Like jerky rough. But it only does it when riding. If I twist the throttle sitting still it revs like a beast. But under load it's rough.
So what have I done and how do I fix it? Thank you all for your help.
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Crackerborn
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« Reply #1 on: October 05, 2014, 07:42:06 PM » |
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You probably have trash logged in the mains which means you will need to drop the bowls and clean from there. The slow jets kick out at 3k. Some here claim this can be done on the beast and I have no doubt it is possible, but my two hams...err, hands, would find that a tight fit. Drain the bowls into a bowl and see what the fuel looks like. Nasty green slimy discharge means you may want to consider a complete overhaul of the carbs. Or at least a complete flushing. Remember that spray carb cleaner will take paint to bare metal, so exercise caution when using it near said painted surfaces. Do a search for carb cleaning procedures on the boards and you will find enough reading to keep you occupied for at least one evening. While you are at it, you may want to make sure all the hoses are in good shape.
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Life is about the ride, not the destination. 97 Valkyrie Tour 99 Valkyrie Interstate  |
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Firefighter
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« Reply #2 on: October 06, 2014, 03:49:20 AM » |
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Usually jerky rough would mean ignition (spark miss) to me, especially with six cylinders but I don't know the whole story. You know your carbs are dirty best make sure your fuel system is clean. Firefighter
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2000 Valkyrie Interstate, Black/Red
2006 Honda Sabre 1100
2013 Honda Spirit 750
2002 Honda Rebel 250
1978 Honda 750
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indybobm
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« Reply #3 on: October 06, 2014, 05:13:20 AM » |
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I would make sure that you reinstalled the rubber things (vacuum pistons) and springs correctly under the chrome covers. Be careful, the vacuum pistons are expensive to replace.
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So many roads, so little time
VRCC # 5258
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signart
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« Reply #4 on: October 06, 2014, 06:40:08 AM » |
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I would make sure that you reinstalled the rubber things (vacuum pistons) and springs correctly under the chrome covers. Be careful, the vacuum pistons are expensive to replace.
+1 on everything said here. If not installed exactly it will not run correctly and you stand a good chance of making a small tear in the diaphragm. Yes, expensive. Don't ask how I know all that. Go back over it, and good luck. |
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Georgia_Dave
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« Reply #5 on: October 06, 2014, 09:49:39 AM » |
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Thank you all for your help. For the vacuum pistons to be installed correctly I assume you mean they're back in place correctly and not pinched by the covers? Position wise there was only one way that they can be.
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Patrick
Member
Posts: 15433
VRCC 4474
Largo Florida
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« Reply #6 on: October 06, 2014, 12:18:18 PM » |
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Thank you all for your help. For the vacuum pistons to be installed correctly I assume you mean they're back in place correctly and not pinched by the covers? Position wise there was only one way that they can be.
I agree that you now probably have an issue with one or more vacuum diaphragms. They are pretty delicate critters and need to be handled with kid gloves as well as being reinstalled correctly. If you didn't have a high engine speed issue before, I think the problem is with something recently done. |
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Michvalk
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« Reply #7 on: October 07, 2014, 04:45:45 AM » |
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You can't expect to wash crud from the top of the carb into the bottom of the carb, and not expect a bad result? You need to clean the whole carb bank!  |
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salty1
Member
Posts: 2359
"Flyka"
Spokane, WA or Tucson, AZ
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« Reply #8 on: October 07, 2014, 06:24:52 AM » |
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Thank you all for your help. For the vacuum pistons to be installed correctly I assume you mean they're back in place correctly and not pinched by the covers? Position wise there was only one way that they can be.
The springs can be positioned wrong sometimes. I agree with some others if it were mine, I would pull the carb bank and go through it again. Sounds like you've had some success. FWIW  ??? |
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My rides: 1998 GL1500C, 2000 GL 1500CF,2006 GL 1800 3A   |
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Georgia_Dave
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« Reply #9 on: October 12, 2014, 05:56:41 PM » |
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I took the advice here and went back to the carbs. Two of my vacuum piston weren't seated correctly, they weren't in the groove and air could get around them. I went ahead and changed my plugs too. It's running much better but still not like I think it's supposed to. I may have to bite the bullet and take it to have the carbs cleaned.
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