john_p_b
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| posted on 22/3/06 at 07:11 PM |
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my webber issues, the latest!
got bored at work today so came home early to get a bit of time in daylight to have a play with the 40's .
first took the jets out, checked them they all were clear. fitted them back in opened the throttle up and there's fuel now getting through so
progress! more seems to be going in the left than the right but but some is better than nowt!
so, basic problem now is the rear carb simply isn't sucking! the front carb is growling as it runs and if you cover the instakes then it almost
dies until you uncover it then it runs fast on the extra fuel. the rear carb doesn't make any difference when covered but still runs faster when
uncovered with the extra fuel going in.
is this just a balance problem and am i better off just borrowing the recovery truck from work and letting the pro's at the carb center in
leicester sort it properly for me?!
built a car, built a home, had a family. lost the family, lost the home, still got the car.
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DIY Si
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| posted on 22/3/06 at 07:40 PM |
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The two carbs are balanced to open the butterflys at the samt time/rate I assume? If so, it means that cylinders 3 & 4 aren't sucking in any
air. Which seems odd. Unless you have a stuck valve or something similar. But I imagine you'd hear that from a mile away. Have you checked that
the two are balanced and that the linkage definitely works?
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john_p_b
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| posted on 22/3/06 at 07:42 PM |
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the linkage all works and everything appears to open as it should.
my dad has just informed me that he "may have swapped the plug leads on 3 and 4 when trying to time it up" gonna have to wait til tomorrow
night when i get home to try swapping the leads. if it turns out to be that then i'm putting myself up for adoption!!!!!
built a car, built a home, had a family. lost the family, lost the home, still got the car.
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britishtrident
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| posted on 22/3/06 at 07:47 PM |
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Webers are very easy to balance just use a 1/2" bore tube as a sethoscope hold it close to the carb mouths a listen to the intake sound for each
barrel in turn -- nb must at exactly the same relative postion.
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02GF74
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| posted on 22/3/06 at 09:43 PM |
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quote:
Originally posted by john_p_b
the linkage all works and everything appears to open as it should.
my dad has just informed me that he "may have swapped the plug leads on 3 and 4 when trying to time it up" gonna have to wait til tomorrow
night when i get home to try swapping the leads. if it turns out to be that then i'm putting myself up for adoption!!!!!
crossflow timing 1-2-4-3; rotro turn anti clockwise; carpi (pint 1-2-4-3)
you should hcekc the leads off the cap to se if they are rtight; ofcourse if swapping 3-4 works, then don;t check in case the firing order is wrong!
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givemethebighammer
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| posted on 22/3/06 at 10:31 PM |
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Always, Geoff Bloor in Nottingham to sort it for you. He's not expensive either
near to Trent Bridge
[Edited on 22/3/06 by givemethebighammer]
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raccoonradar
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| posted on 22/3/06 at 11:05 PM |
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still sounds like an air leak with "the rear carb doesn't make any difference when covered but still runs faster when uncovered with the
extra fuel going in".
Have you tried spraying easy start or like around carb base etc, to see if revs pick up ?
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Marcus
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| posted on 23/3/06 at 06:56 PM |
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You aint got a blocked pipe to the carb, have you? The banjo bolt could have been replaced with a normal bolt! (seen it done  ).
Marcus
Marcus
Because kits are for girls!!
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john_p_b
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| posted on 23/3/06 at 07:00 PM |
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quote:
Originally posted by raccoonradar
still sounds like an air leak with "the rear carb doesn't make any difference when covered but still runs faster when uncovered with the
extra fuel going in".
Have you tried spraying easy start or like around carb base etc, to see if revs pick up ?
i'm inclined to agree with you now. it's really the only explaination. going back to square 1 at the weekend though. fit the old carb back
on as i know that is crack on then i can eliminate a timing problem then i'll just work from there with the carbs.
built a car, built a home, had a family. lost the family, lost the home, still got the car.
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john_p_b
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| posted on 23/3/06 at 07:01 PM |
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quote:
Originally posted by Marcus
You aint got a blocked pipe to the carb, have you? The banjo bolt could have been replaced with a normal bolt! (seen it done ).
Marcus
nah there's fuel in both float chambers.
built a car, built a home, had a family. lost the family, lost the home, still got the car.
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Pezza
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| posted on 23/3/06 at 07:41 PM |
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I had the same problem on my xflow in the westy on twin 40's.
stripped both carbs down and rebuilt with new gaskets et all to no avail.
After all that it turned out to be a tiny hole in the rubber gasket that joined the mannifold to the engine, was sucking air in there instead of
through the carb.
Exact same symptoms you've described.Could be worth a check if ony to save money.
Ben
[Edited on 23/3/06 by Pezza]
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