wellerchap Posted May 5 Share Posted May 5 Mikuni BS26 carb - leaks profusely once fuel is switched on...observing the leak suggested it was all coming out of the floatbowl gasket area (bought a new one, with other rubber washers/seals and needle), but upon close inspection of the photos I took it looks like the fuel is wetting the carb body, well above the floatbowl seal (see yellow arrow). If a float needle sticks open, will it just leak out of the overflow stub at the very base of the floatbowl, or spew out further up, too? The other pic shows shiny (wet?) carb sides, a big drip from the overflow stub and the puddle forming on top of the gearbox below. Where's the issue likely to be? Quote Link to comment Share on other sites More sharing options...
Simon Davey Posted May 5 Share Posted May 5 If the float sticks with the valve in the open position, it should come out of the overflow spout at the bottom, unless that's blocked. Then, it'll just flood the carb/engine. I'd put money on a fuel line leak further up, or the fuel tap, and that it's just running down to the carb body. Quote Link to comment Share on other sites More sharing options...
husoi Posted May 5 Share Posted May 5 It could well be a faulty float that can have a hole and isn't working anymore. Or needing adjusted to proper height. The float valve itself is not sealing properly. Or as @Simon Davey says. 1 Quote Link to comment Share on other sites More sharing options...
wellerchap Posted May 6 Author Share Posted May 6 Thank you chaps - I'll be there tomorrow (son-in-law's) to put in the new seals, so will double check those issues then too. Quote Link to comment Share on other sites More sharing options...
Hairsy Posted May 6 Share Posted May 6 Try to dry it completely (with the petcock switched off). Then turn the petcock on just for a second or two and try to spot the source of the leak. I once spent lots of time trying to locate a leak like this and it turned out to be a fuel pipe above the carb that was dripping onto the carb and then down. 2 Quote Link to comment Share on other sites More sharing options...
wellerchap Posted May 11 Author Share Posted May 11 (edited) Seem to have sorted it - replaced the float bowl gasket for a new one (the old one seemed compressed in one corner, and flattish/hard)....no signs of the smelly, unleaded stuff yet! Edited May 11 by wellerchap 4 Quote Link to comment Share on other sites More sharing options...
Simon Davey Posted May 11 Share Posted May 11 Good news Quote Link to comment Share on other sites More sharing options...
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