Fudd
Member
Posts: 1733
MSF RiderCoach
Denham Springs, La.
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« on: August 24, 2015, 06:31:45 PM » |
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All 6 of my fuel/air mixture screws were frozen on my carbs. After removing the assembly and soaking in liquid wrench, 4 of them freed up. The screws on cylinders, 2 & 4 couldn't be loosened. We tried cutting a slot with a dremel and all that to no avail.
These two cylinders are running very rich and quickly foul their sparkplugs. My goal is to find either a complete set of carbs, or perhaps just those two and replace as necessary.
I have DynaJet needles installed and they are set on the 2nd groove from the top.
Would it be possible to compensate somewhat for the rich condition by moving the 'E-clips' up one more notch to the top groove?
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Pete
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« Reply #1 on: August 24, 2015, 07:03:23 PM » |
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Just order 2 carb bowls complete.
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Fudd
Member
Posts: 1733
MSF RiderCoach
Denham Springs, La.
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« Reply #2 on: August 24, 2015, 07:06:33 PM » |
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Just order 2 carb bowls complete.
OK, never thought of that. I'll look into it. |
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Save a horse, ride a Valkyrie |
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Fudd
Member
Posts: 1733
MSF RiderCoach
Denham Springs, La.
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« Reply #3 on: August 24, 2015, 07:27:43 PM » |
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Replacing the bowl won't help. The mixture screw goes into the carb body.
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Save a horse, ride a Valkyrie |
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Pappy!
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« Reply #4 on: August 24, 2015, 08:17:00 PM » |
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These screws can and will loosen with the help of a propane, butane, or Map gas torch. Doesn't take much heat at all to loosen them. Heat the housing surrounding the threads of the screw.
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Ricky-D
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« Reply #5 on: August 25, 2015, 06:51:27 AM » |
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Those screws are not the cause of the rich running that you describe. You're fooling yourself by thinking they are the cause.
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2000_Valkyrie_Interstate
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Patrick
Member
Posts: 15433
VRCC 4474
Largo Florida
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« Reply #6 on: August 25, 2015, 08:35:29 AM » |
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I agree that heat and some penetrating oil should get them out, especially if a screwdriver slot has been cut in them.
I use a dab of never-seize on the threads when reinstalling.
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Joevalk
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« Reply #7 on: August 30, 2015, 02:05:50 PM » |
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Bring them to Texas, we can thaw an iceberg in mins  |
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Robert
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« Reply #8 on: September 01, 2015, 05:51:58 PM » |
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I agree on the rich running NOT being the idle screws, They wont foul a plug that fast.
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“Some people see things that are and ask, Why? Some people dream of things that never were and ask, Why not? Some people have to go to work and don’t have time for all that.”
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Tfrank59
Member
Posts: 1364
'98 Tourer
Western Washington
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« Reply #9 on: September 01, 2015, 07:35:16 PM » |
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I agree on the rich running NOT being the idle screws, They wont foul a plug that fast.
Did you mean fuel/air mixture screws? That's what he's dealing with. Anyways, what does change the lean/rich, the jets? |
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-Tom
Keep the rubber side down. USMC '78-'84
'98 Valkyrie, ‘02 VTX 1800, '96 Royal Star, '06 Drifter, '09 Bonneville, '10 KTM 530, '04 XR 650, '76 Bultaco, '81 CR 450, '78 GS 750...
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98valk
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« Reply #10 on: September 02, 2015, 03:09:31 AM » |
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I agree on the rich running NOT being the idle screws, They wont foul a plug that fast.
Did you mean fuel/air mixture screws? That's what he's dealing with. Anyways, what does change the lean/rich, the jets? too big pilot jet or idle mixture screws opened up too much richer aftermarket needles, or aftermarket needles adjusted too rich or oem needle shimmed too high main jet too large. vacuum slide modified to raise too fast or too weak of a spring allowing the same. |
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C 10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp
"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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Robert
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« Reply #11 on: September 02, 2015, 04:13:36 AM » |
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I agree on the rich running NOT being the idle screws, They wont foul a plug that fast.
Did you mean fuel/air mixture screws? That's what he's dealing with. Anyways, what does change the lean/rich, the jets? We are both right they are fuel air mixture screws but only work for idle and a bit above really. CA said a few things but I would also check. I would replace the float needle and seats and check the floats themselves. The slide needles must also be uniform height usually have notches on them and usually the second to third notch is the one it should sit at. Clean the jets well and the emulsifier tubes if you don't those will also cause solid gas to be pulled into the engine instead of fuel air mix. You have 3 sets of jets that do change the mixture, the idle jet, the slide needle and the main jet. The idle jet factory is 35, the slide needle is for most of the normal running range of the engine say 1500 to full throttle but the main jet limits the amount of fuel at the top engine rpm. This is because the needle is almost out of the hole it goes into so gas is limited by the main jet. This is usually a 85 or 95 if memory serves. May help as far as information on jets and carbs http://www.dansmc.com/carbs2.htm |
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« Last Edit: September 02, 2015, 05:37:31 AM by Robert »
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“Some people see things that are and ask, Why? Some people dream of things that never were and ask, Why not? Some people have to go to work and don’t have time for all that.”
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