Leaking Bing Carb

[vaughan]

Hi, I have a Bing Carb fitted to my Ossa TR 350 1977 which in spite of new Seals and bowl Gasket leaks fuel over my nice fresh engine enamel.

Does anyone know of a replacement alternative, a knowlagable friend said he used a 'Kawasaki KMX 125' item with good performance and no leaks, Any advice most welcome.

Cheers,

Vaughan.

[totalshell]

dont know of a replacement but why not spend the extra day stoppping the leak,

• a, make sure needle valve is clean and seating cleanly, lap it on like a valve to be 100%
  
• b, set the tab so the needle only has to move 1/16 (its either open or closed and doesnt need to be wide open)
  
• c, set the float/s so your 100% that they close the valve ( are the float/s punctured?)
  
• d, get the joining surfaces of the bowl and carb body so they are square and clean use something like ink to ensure that the surfaces are true
  
• e, use new gasket and put some sealent (very lightly) on both surfaces to iron out any imperfections
  

all the above can add up to leaky carby, and they will be cheaper than a new one

Edited April 11, 2007 by totalshell

[woody]

You can use a 26mm MK2 Amal, as per Gripper, which are still available new and easy to jet, 25 pilot, 106 needle and 160 main would be pretty close at a guess.

Or you could use a Mikuni as fitted to TY Yamaha twinshock, TK from a Yam mono, buy a new Mikuni from Allens, use a Dellorto from GasGas/Beta etc. but any of these will require time messing with jets to get right as there is no 'base' setting - unless Allens have jet settings for the new Mikunis they sell. Or you could be lucky and it would run ok right away as fitted with no changes.

Amal is the easiset to work with.

Are you sure it isn't just float setting or a leaking float that is causing the problem on the Bing.

[vaughan]

Thanks Totalshell & Woody, I will have another try with the Bing following Steps A to E if that doesnt work I will look for an Amal,

Appreciate the advice,

Vaughan.

[bob abell]

Check your floats...make sure they are not 'sinkers' happened on the Bing on my Bultaco. New ones floated in a bowl of gas, old ones almost completely submerged.

[peterb]

Hi Vaughan,

If all of these mods fail with the Bing, I recommend a 26mm DellOrto as fitted to a new Gas Gas 250/280/300, uses all the correct size jets and needle except for needing a change to a 95 or 100 main jet - easy to get hold of, or just solder up the original main jet and drill with a 1.0mm diameter drill bit. This carb needs no further mods. I have fitted many of these carbs to the older 250 and 325 Bultaco's with good results.

Have also used a 26mm Mikuni from a Kawasaki KT 250 which was ok, but not as good as the DellOrto, best carb on my 325 Bult is a 28mm Keihin set up for a 300 GG but with 1.0mm dia main jet and GJH needle.

Bye, PeterB.

[vaughan]

Hi Vaughan,

If all of these mods fail with the Bing, I recommend a 26mm DellOrto as fitted to a new Gas Gas 250/280/300, uses all the correct size jets and needle except for needing a change to a 95 or 100 main jet - easy to get hold of, or just solder up the original main jet and drill with a 1.0mm diameter drill bit. This carb needs no further mods. I have fitted many of these carbs to the older 250 and 325 Bultaco's with good results.

Have also used a 26mm Mikuni from a Kawasaki KT 250 which was ok, but not as good as the DellOrto, best carb on my 325 Bult is a 28mm Keihin set up for a 300 GG but with 1.0mm dia main jet and GJH needle.

Bye, PeterB.

Thanks PeterB, I have lots of opportunities to try, to keep the bike Original if pos im going to try to improve the bing if that wont work I will get a replacement,

Thanks Everyone for the advice,

Vaughan.