Russell
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| posted on 7/2/10 at 05:36 PM |
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Oh and about the same amount of petrol comes out of each vent pipe (one pipe for carbs 1&2; one pipe for 3&4) so it's some kind of
problem common to both pairs of carbs.
I can only think that one or more float valves isn't closing properly when under pressure from the pump????
I'm a bilingual illiterate. I can't read in two languages.
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jacko
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| posted on 7/2/10 at 07:45 PM |
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The pump you have is of a bike that has carbs and not injection ?
How i checked my carbs was when the carbs are not fitted blow down the fuel pipe and turn the carbs upside down it should cut the flow of air if not
you nead to look at the floats / cut of valves
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Russell
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| posted on 7/2/10 at 08:23 PM |
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quote:
Originally posted by jacko
The pump you have is of a bike that has carbs and not injection ?
How i checked my carbs was when the carbs are not fitted blow down the fuel pipe and turn the carbs upside down it should cut the flow of air if not
you nead to look at the floats / cut of valves
I'd say definitely carb.
Good tip re. testing the float valves - I'll try that thanks.
I'm a bilingual illiterate. I can't read in two languages.
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FazerBob
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| posted on 9/2/10 at 12:34 AM |
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flooding carbs
I had the same problem a couple of years ago when I put a set of Fazer 600 carbs on my car. I had spaced the carbs correctly to fit on my home made
manifold. Then to keep it all looking neat and tidy, I removed the pipes and t-pieces at the top of the carbs (1 t-piece between 1&2, and another
between 3&4) I then connected nice new clear pipes between 1&2, and 3&4 with a single T-piece between 2&3. (hope that all makes sense,
as I can't find the photo at the moment)
Anyway, it all looked brilliant - until I ran the engine and ended up with fuel spilling out of the carb inlet bell mouths!
I hadn't realised that the carbs only vent to one side, even though the tubular casting appears to be open at both sides. By putting unvented
pipes between 1&2 (also 3&4) I had connected the carb vents to its neighbour, but not allowed them to vent to the open.
In summary: left hand carb (No1) vent faces carb No2. Carb No2 vent faces carb No1. The same rules applies to the other pair of carbs ie carb 3
vents towards carb 4, and carb 4 vents towards carb 3.
simples eh!!
Bob
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Russell
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| posted on 9/2/10 at 06:32 PM |
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quote:
Originally posted by FazerBob
I had the same problem a couple of years ago when I put a set of Fazer 600 carbs on my car. I had spaced the carbs correctly to fit on my home made
manifold. Then to keep it all looking neat and tidy, I removed the pipes and t-pieces at the top of the carbs (1 t-piece between 1&2, and another
between 3&4) I then connected nice new clear pipes between 1&2, and 3&4 with a single T-piece between 2&3. (hope that all makes sense,
as I can't find the photo at the moment)
Anyway, it all looked brilliant - until I ran the engine and ended up with fuel spilling out of the carb inlet bell mouths!
I hadn't realised that the carbs only vent to one side, even though the tubular casting appears to be open at both sides. By putting unvented
pipes between 1&2 (also 3&4) I had connected the carb vents to its neighbour, but not allowed them to vent to the open.
In summary: left hand carb (No1) vent faces carb No2. Carb No2 vent faces carb No1. The same rules applies to the other pair of carbs ie carb 3
vents towards carb 4, and carb 4 vents towards carb 3.
simples eh!!
Thanks Bob, I retained the principle of the two t-pieces (but lovingly recreated in brass and solder) so I think it's a different problem.
Searching on the 'net it appears that the O-rings where the float stem pushes into the carb casing can perish or shrink over time. My carbs
were stood in the garage for years before I fitted them to the car so this is another possible fault.
Having priced up the cost of spares I'm tempted to just buy another set of carbs and start over 
I'm a bilingual illiterate. I can't read in two languages.
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