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I've got a set of carbs from a late eighties Honda CBR1000 FH on my Polo and there are 2 sets of (what look like) fuel pipes - a fat one underneath the carbs and then a smaller pipe coming out between each pair on the top side. I'm assuming that one is in and one is out although being as though I'm still learning about bike carbs I'm not sure. Can anyone enlighten me?  You can just see one of them in the photo, stuck up between the first 2. |
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 You can see the fat pipe underneath in this photo  |
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In fact, you can see the thin ones as well - they're folded down between each pair of carbs. I'm starting to think they may be some sort of vacuum connection...
Anyone know?
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the fat one is fuel in
for some reason I seem to think the thin ones are used to sense air pressure. I cant remember why I think this. If no one can confirm or help further I will go out and which the tanke of my NC and have a closer look for you
actually, when I get off of 'tiscali indian compulsary call holding service' I will go check the haynes for you
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Last Edit: Nov 20, 2006 9:29:31 GMT by Keefy
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You have a Haynes? You Legend!!!!! I've just found a thread where someone is asking the same question on an American Fireblade forum. Qudos to the US bike dudes, they go all out to help the guy, even though he doesn't even have a bike. Ironically enough, he's got a Golf GTI and lives in Wales! www.fireblades.org/forums/general-discussion/44863-help-needed-carbs.html |
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Is there no fuel return? That could be a problem  |
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dp
Posted a lot
DP Race Tech
Posts: 1,044
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autohausdolby in da house:
Is there no fuel return? That could be a problem
Noop there's NO fuel return on those and the thin lines could be a float chamber breather, can't really see them, and yes the fat one is fuel IN.....
DP says: Most of these setups run without fuel pumps and need no return pipe....
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Last Edit: Nov 20, 2006 9:56:19 GMT by dp
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I'm just checking now
there is definitely no return, isnt that only for FI setups?
Anyway, the fuel is gravity fed so there is definitely no way it could get back to the tank
edited to add - opps, dp beat me to it ;D
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Last Edit: Nov 20, 2006 9:57:23 GMT by Keefy
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Nov 20, 2006 10:02:58 GMT
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Ah, ball cocks. I wonder how they'll react to being fed from an electric pump? I've got a very low pressure Facet pump but I'm still about concerned about over fuelling the carbs.
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bstardchild
Club Retro Rides Member
Posts: 14,962
Club RR Member Number: 71
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Nov 20, 2006 10:05:43 GMT
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Ah, ball cocks. I wonder how they'll react to being fed from an electric pump? I've got a very low pressure Facet pump but I'm still about concerned about over fuelling the carbs. If you do end up over fueling the carbs the excess fuel will come out of those thin tubes as they are the over flow pipes I reckon |
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dp
Posted a lot
DP Race Tech
Posts: 1,044
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Nov 20, 2006 10:33:32 GMT
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autohausdolby in da house:
I wonder how they'll react to being fed from an electric pump?Most likely it can be corrected with an adjustble fuel pressure regulator like this....  DP says: Problems are to be solved......
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Nov 20, 2006 11:02:51 GMT
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I've got a filter king one but I'd like one with a return on it. I'm not especially impressed with the one I've got either as it leaks |
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Nov 20, 2006 18:48:26 GMT
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think its vacuum have asked a few mech mates.............
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2001 HONDA CT110 (NOT RCV)
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Nov 20, 2006 18:56:04 GMT
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that pipe is tickover adjustment as its connected to the black wheel doodah on the left
should know i got one on the pan (doh)
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2001 HONDA CT110 (NOT RCV)
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