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Grumpy
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« on: October 09, 2011, 09:20:24 PM » |
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Has any one changed the slow jets without pulling the carbs ? My bike runs great, but idles lousy, almost seems like it has a slight intermittent miss at idle and is kind of lopes , definitely not the smooth idle it used to have. I have tried the various cleaners, seafoam and others, does not seem to help. Bike is healthy other wise, plugs recent, compression good and intake o-rings are ok. I just hate to pull the carbs if it is not necessary. Also had the carbs synced not too long ago, but this has just started recently.
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 Life is like a hot bath. It feels good while you’re in it, but the longer you stay in, the more wrinkled you get. |
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GOOSE
Member
Posts: 704
D.S. #: 1643
Southwest Virginia
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« Reply #1 on: October 09, 2011, 10:56:51 PM » |
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grumpy....yes, you can change the slow jets without pulling the carbs, and yes i have done it this way...but by the time you have pulled the tank/air box/and everything else, why not just pull them out and do it? if you do change the slow jets go from the 35's to the 38's, they seem to do alot better. good luck.
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9Ball
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« Reply #2 on: October 10, 2011, 02:31:41 AM » |
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It sure is a lot easier to work on the carbs on the bench....also, you can do a much better job of cleaning and inspecting with them off the bike. The bowl screws can be difficult to remove even on the bench....
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VRCC #6897, Joined May, 2000
1999 Standard
2007 Rocket 3
2005 VTX 1300S
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BonS
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« Reply #3 on: October 10, 2011, 05:55:59 AM » |
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Slow jets flow fuel at all rpm's so driving at any speed flows fuel through the them. At higher rpm's the main jet combined with the jet needle metering circuits add additional fuel for proper running. By varying your driving speeds and rpm's you'll be treating your all your carburetor circuits with the fuel additive cleaning chemicals.
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Chiefy
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« Reply #4 on: October 10, 2011, 01:01:33 PM » |
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Does it stumble off the line or hesitate? If not, don't start tearing the carbs down. Mine had the same miss/loping you described. It would come and go some. Lately I found some non ethanol gas, and all that went away. She purrs like a kitten.
I might not keep putting non ethanol in it ($$$) But at this point I feel confident that nothing is wrong, anyway.
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 1998 Valk Standard 52,500 miles |
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John Schmidt
Member
Posts: 15260
a/k/a Stuffy. '99 I/S Valk Roadsmith Trike
De Pere, WI (Green Bay)
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« Reply #5 on: October 10, 2011, 07:52:26 PM » |
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Bill, if you do decide to change the slow jets, just pull the carb set. It's really not that big a chore, call me if you like and I can give you a couple pointers on pulling them ahead of time. First one....drain all the carbs before doing anything. (don't ask)  |
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Grumpy
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« Reply #6 on: October 10, 2011, 08:03:25 PM » |
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Bill, if you do decide to change the slow jets, just pull the carb set. It's really not that big a chore, call me if you like and I can give you a couple pointers on pulling them ahead of time. First one....drain all the carbs before doing anything. (don't ask) I know, did it a couple years ago, Interstate is a lot more work, last time pods, engine hangars , tank and air-box etc had to come off, and was still a tight fit getting them out. Interstates have that plastic barrier behind the radiator that gets in the way. |
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Life is like a hot bath. It feels good while you’re in it, but the longer you stay in, the more wrinkled you get. |
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Ricky-D
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« Reply #7 on: October 11, 2011, 09:36:37 AM » |
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I'd suggest trying all the simple things to improve the idle characteristics before attempting to change what up to now has been seemingly a good running motor.
Try getting your gas at a different gas station for a while. If you can get non-ethanol gasoline, get that! If you've been using regular grade try premium for a while.
Spray all of the throttle linkage with a good lubricant including the enrichment valves, everything behind the chrome covers and be very generous when spraying, like you're cleaning along with spraying. Nothing will be altered and all the excess will easily drain out to the ground.
Turn the idle up to the high end of the range.
Use a good dose of Techron or some similar like B-12. I like those better than Seafoam.
Check your battery for a good state of charge and the output of the alternator.
So much you can do before tearing into the carburetors. That should be the last resort.
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2000_Valkyrie_Interstate
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