Deckman001
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 posted on 30/10/06 at 03:37 PM |
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Bike carbs fuel needs ?
Hi all, I'm trying to sort out the fuel requirements for a set of Mikuni(?) 34mm choke carbs to run a x/flow, I'm thinking of using the
bank of four carbs and am unsure if I need to change the fuel pump from the engine driven one to an electric one ? Any one done this before on an
x/flow ??
Thanks
Jason
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givemethebighammer
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| posted on 30/10/06 at 03:56 PM |
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The advantage of using a bike fuel pump is that they require no pressure regulator. They pump until they sense back pressure in the fuel line (needle
valves in float chamber closed), then slow down / shut off. Most bike carbs are very pressure sensitive (they were often just gravity fed from the
tank above with no fuel pump.). The mechanical pump should be able to supply the amount of fuel you require, but you'll get more control with
the electric one.
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Deckman001
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| posted on 30/10/06 at 04:58 PM |
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Cheers, I did look at the pump for the std carbs, I think they are from an R6 ? all the bike pumps apear to be tank fitted, so what pumps do other
peeps use then ??
Thanks again
Jason
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givemethebighammer
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| posted on 30/10/06 at 05:05 PM |
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The in tank ones tend to be fuel injection pumps - far too higer pressure for carbs.
You need something from a 97-99 carbed bike like this
http://cgi.ebay.co.uk/LOOK-RARE-GENUINE-YAMAHA-YZF-R1-R-1-FUEL-PUMP-ASSEMBLY_W0QQitemZ200040565131QQihZ010QQcategoryZ10490QQssPageNameZWDVWQQrdZ1QQcmd
ZViewItem
http://cgi.ebay.co.uk/YAMAHA-R6-FUEL-PUMP_W0QQitemZ110047293202QQihZ001QQcategoryZ10490QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
just check it has come from a carb rather than injection model.
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Kissy
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| posted on 30/10/06 at 05:41 PM |
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Whatever you do, don't try to use anything other than a bike pump - as already mentioned they are sensitive. I and others have had fun and
games trying to make Facet pumps work. Forget it, you'll get uneven idle and a crappy response + fuel pi**ing out of various orifices. I
flogged my Red Top, bought a bike pump and made twenty quid into the bargain.
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Deckman001
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| posted on 30/10/06 at 05:44 PM |
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Why don't E-bay sellers say how much for p&p !!!!! 
Anyone in Yorkshire able to pick it up for me If I win it 
Jason
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udo
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| posted on 30/10/06 at 06:50 PM |
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Bike carbs fuel needs
Would a bike fuel pump still work if you are only using two out of the four carbs?(fitting some to my classic mini at the moment in case you wonder
why only two!)
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oliwb
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| posted on 30/10/06 at 07:35 PM |
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Yep it will work just the same working only the 2 carbs. Just wont have to work as hard as if there were 4! Oli.
If your not living life on the edge you're taking up too much room!
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udo
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| posted on 30/10/06 at 07:44 PM |
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Thanks Oli
P.S. sorry for the hijack Deckman
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MikeRJ
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| posted on 30/10/06 at 07:47 PM |
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You can buy pressure regulators specialy for carb applications, I have one on my striker. You can use a facet pump (or even the mechanical one) but
turn the pressure down to prevent flooding. They are not suitable for use with an injcetion type pump though.
e.g. http://www.burlen.co.uk/partDetail.aspx?partID=52544
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Deckman001
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| posted on 30/10/06 at 09:18 PM |
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Cheers for all the help, I now have an R6 one ordered off E-bay, and a gsxr one being delivered tomorrow 
oh, and it wasn't a hijack, it was extra information usefull to all 
Jason
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roadrunner
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| posted on 30/10/06 at 09:24 PM |
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Just been driving my 2ltr pinto with zx9 carbs using pinto pump ,,, it pops and farts like mad on over run, good job i've just fitted a zx6 pump
to calm it down a tad, not driven it yet , i'll let yoy know what its like later.:
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Deckman001
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| posted on 30/10/06 at 09:38 PM |
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Many, Many thanks, we all want to know first hand !!
Jason
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givemethebighammer
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| posted on 30/10/06 at 10:10 PM |
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£6 for the R6 pump that was a bargain!
It should work fine, my R1 pump keeps my blackbird carbs running without any problems.
ps my pump is horizontally mounted next to the tank at the rear of the car. Also have pre and post pump filters fitted.
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yorkshire-engines
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| posted on 30/10/06 at 10:25 PM |
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Hi give me a bell if its close ill get it for you
malc 07960011585
and if you dont want it and use the gsxr one ill give you your six quid back
cheers malc
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