spiderman01980
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| posted on 2/6/10 at 09:12 PM |
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HELP!!! from a bike carb expert!!!
what are theese holes circle in red?
i seem to have petrol flowing out of them!
what is there job what are they there for?
 
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prawnabie
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| posted on 2/6/10 at 09:18 PM |
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Look like air correction holes, have you got the fuel pipes plumbed up right?
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trikerneil
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| posted on 2/6/10 at 09:25 PM |
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Possibly floats stuck or float heights set incorrectly.
Neil
ACE Cafe - Just say No.
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Dingz
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| posted on 2/6/10 at 10:05 PM |
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What fuel pump are you using?
Phoned the local ramblers club today, but the bloke who answered just
went on and on.
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trikerneil
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| posted on 3/6/10 at 05:10 AM |
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Good point Dingz, those carbs are probably designed to be gravity fed.
Neil
ACE Cafe - Just say No.
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David Jenkins
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| posted on 3/6/10 at 06:25 AM |
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If this is the first time you've connected these carbs - I'd suspect that you're putting fuel into the wrong pipes, maybe the ones
that vent the top of the float chamber...
...but otherwise - sticky float valves or too high a fuel pressure, as stated above.
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Surrey Dave
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| posted on 3/6/10 at 07:45 AM |
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Pressure?
Probably floats stuck or too much fuel pressure you only need about 1 - 1.5 lbs on bike carbs, a lot of people use a bike pump which automatically
cuts off , or you can use a filter king fuel regulator but it has to be set very low, an accurate way of measuring the pressure is with a clear
vertical tube 28" per pound of pressure? can't remember off hand......
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tony-devon
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| posted on 3/6/10 at 07:50 AM |
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if its all of them that are leaking out, then its a bit unlikely to be the float needles
sounds like excess fuel pressure
them carbs are normally gravity fed
either lower the pressure on the fuel pump
or
I once put a small tank above the carb height, then fed the pump to this with a return from the top to the main tank.
was my simple dodge/cure
heavy is good, heavy is reliable, and if it breaks, hit them with it
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NigeEss
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| posted on 3/6/10 at 08:28 AM |
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quote:
Originally posted by tony-devon
I once put a small tank above the carb height, then fed the pump to this with a return from the top to the main tank.
was my simple dodge/cure
Sounds like a neat alternative to a swirl pot too 
Time is an illusion. Lunchtime doubly so.................Douglas Adams.
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tony-devon
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| posted on 3/6/10 at 10:14 AM |
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it was a method that I used on a custom bike
the fuel tank was hidden/integral with the frame, but with a tiny tank in the top tube of the frame to provide the gravity feed for the carbs
the fuel was fed at its own pace, the system worked very well
heavy is good, heavy is reliable, and if it breaks, hit them with it
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r1_pete
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| posted on 3/6/10 at 11:08 AM |
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1st question as has been asked, where have you connected the fuel, should be into that plastic T, with the pipes feeding 1&2 and 3&4.
The other pipes on show are water heaters and can be discarded, from memory there are two more higher up the carbs which are vents.
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spiderman01980
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| posted on 3/6/10 at 07:20 PM |
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a Facet fuel pump which i think it pumps bout 4 to 7 psi! i have been advised to put a regulator on it, but it was doing that when i put a little tank
above it with out the pump!
quote:
Originally posted by Dingz
What fuel pump are you using?
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spiderman01980
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| posted on 3/6/10 at 07:24 PM |
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yeah its connected to the T!
quote:
Originally posted by r1_pete
1st question as has been asked, where have you connected the fuel, should be into that plastic T, with the pipes feeding 1&2 and 3&4.
The other pipes on show are water heaters and can be discarded, from memory there are two more higher up the carbs which are vents.
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David Jenkins
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| posted on 3/6/10 at 09:25 PM |
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quote:
Originally posted by spiderman01980
a Facet fuel pump which i think it pumps bout 4 to 7 psi! i have been advised to put a regulator on it, but it was doing that when i put a little tank
above it with out the pump!
Far, far too high a pressure - a bike pump gives about 1.5psi but with a high volume. I know that you've tried a gravity feed, but you'll
have to sort the pump out regardless of whatever's causing this issue.
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FASTdan
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| posted on 4/6/10 at 07:16 AM |
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Our facet redtop works well with the ZX9R's using a filterking style regulator to turn the pressure down to 1.5psi.
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