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Dozer
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« on: May 13, 2012, 12:52:38 PM » |
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I found a fuel screen in the inlet tube on the carb just prior to the fuel going through the float needle and into the bowl. All 6 carbs have them and several arent in the same location. They seem to be kinda loose and float around. Theres no mention of them in the maintenance manual or in the parts fisch. Whats "normal" for these things? If they dont completely cover the tube (like a gate) then what purpose could they serve? Maybe I disturbed them when I blew out the carbs with my compressor. I reduced the pressure to 50 PSI to blow out the water after a soak in the cleaner.. or maybe it was the last dealer who did ths job...I dont know.
Anyone know anything about these screens? Am I screwed? Can they be repositioned? Are they supposed to float? I am gonna hold off on the rest of this rebuild till I find out more about these screens. I would post a pic of it but I dont know how..
Thanks
D
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Blackduck
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« Reply #1 on: May 13, 2012, 03:56:59 PM » |
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They are just extra filter screens like the one on the petcock.
Have found the same thing in an Evinrude outboard, nothing in any parts or service manual.
They had block enough we had fuel starvation.
Not much you can do with them,the fuel pipes are pressed in.
About all you can do is blow them out with air as you have done.
If they are not seating properly you could add an inline filter but opinions vary as to whether they cause restriction to fuel flow.
Cheers Steve
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2001 Standard, 78 Goldwing, VRCC 21411
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Dozer
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« Reply #2 on: May 13, 2012, 05:02:30 PM » |
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Blackduck...thank you very much for your reply. It doesnt make me feel much better but at least now I know. I did find this though. http://www.shopsbt.com/pdfs/keihincdk2.pdf Even though these are not our carbs, the screen looks the same. Its the last pic on the bottom right. It says they are replaceable on that model carb but dosent say how. I think I can live with it now but I am disappointed that it was not mentioned in the book or IPC. Looks like it has the potential to be a major problem I wonder how many high speed issues this thing may have caused and been misdiagnosed. Thanks again for your reply Sir. I will continue the rebuild now D |
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JaysGone
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« Reply #3 on: May 13, 2012, 07:50:53 PM » |
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Regardless of the carb make.
if my bike has them and I can.
I remove them.
I do use a fuel filter plus the filret in the petcock.
They are totally redundant........
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 1999 Valk - SOLD 2005 Yamaha RoadStar 2010 GoldWing with Motor Trike Kit |
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Dozer
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« Reply #4 on: May 14, 2012, 07:01:11 AM » |
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I dont know if they can be completely removed or not. Id hate to try to remove it and end up leaving a piece of it in there...
It looks like the #6 carb is blocked by the screen but then theres not another carb in series with it to be blocked. Looks to be a good idea, just a poor application IMO.
I think i'm gonna call a dealer tomorrow and see if I can find a tech who might know something about them. I am probably making a mountain out of a mole hill but I'm kinda anal that way sometimes....
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Dozer
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« Reply #6 on: May 14, 2012, 10:04:40 AM » |
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Thanks for your input Rick. YES! Thats the one. See how it only partly covers the tube? I dont see how that can be very effective. At any rate, if that pic is normal, I guess mine are normal too. Would you suggest the same as blackduck and jay that I either ignore it or try to remove it? The only other fuel filter on the bike is the one on top of the petcock in the tank and it seems to be in pretty good condition
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Bigwolf
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« Reply #7 on: May 14, 2012, 09:49:55 PM » |
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See how it only partly covers the tube? I dont see how that can be very effective. The screen covers the opening of the float valve not the opening of the fuel rail tubes. It is as effective as a screen can be in the fuel system except for the fact that it is not normally replaceable. Bigwolf |
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Ricky-D
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« Reply #8 on: May 15, 2012, 07:06:34 AM » |
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You could remove the float needle and use a vacuum on the port where the screen is visible.
I never recommend using air pressure on carburetor passages.
There are many places in a carburetor where passages and galleries are blocked off with a plug.
Too much air pressure can blow out a plug or clog up a small orifice.
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2000_Valkyrie_Interstate
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Dozer
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« Reply #9 on: May 15, 2012, 09:09:32 AM » |
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You could remove the float needle and use a vacuum on the port where the screen is visible.
I never recommend using air pressure on carburetor passages.
There are many places in a carburetor where passages and galleries are blocked off with a plug.
Too much air pressure can blow out a plug or clog up a small orifice.
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I agree...thats why I turned the pressure down to 50 PSI. I didnt think that would been too much to do any damage |
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Dozer
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« Reply #10 on: May 15, 2012, 09:13:18 AM » |
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See how it only partly covers the tube? I dont see how that can be very effective. The screen covers the opening of the float valve not the opening of the fuel rail tubes. It is as effective as a screen can be in the fuel system except for the fact that it is not normally replaceable. Bigwolf I guess the screen catches the big stuff. I am having a hard time visualizing exactly where its installed the the passage. But it was that way when I took it out apart so it will probably be that way going back together |
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wild6
Member
Posts: 251
(Old enough to know better)
Vernon, NJ
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« Reply #11 on: May 15, 2012, 11:59:50 AM » |
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The fuel flows straight through the passage, out the other side of the carb to the next one. The screen is a dome that covers the float valve inlet which is at right angles to the passage. It's sort of like the leg of a tee (the domed screen is covering the leg outlet).
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  “Meddle not in the affairs of the Dragon, for you are crunchy and taste good with ketchup.” |
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Dozer
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« Reply #12 on: May 15, 2012, 01:18:59 PM » |
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The fuel flows straight through the passage, out the other side of the carb to the next one. The screen is a dome that covers the float valve inlet which is at right angles to the passage. It's sort of like the leg of a tee (the domed screen is covering the leg outlet).
AH-SO! NOW I have it..its a dome....that clears it up...thanks a million  |
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