Leaky carb'

[arcturus]

Could this be the cause,all the pitting on the contact area where the jet holder mates with the carb' body? I have never been able to stop this carb weeping no matter which seal type I use. I think that I will try a smear of gasket sealant on the face in the hope that some of the pitting will be filled. Any comments?

[Bob Meadows]

J.B.Weld is a very useful product for such problems (two pack epoxy) you would have to remove the carburettor to gain proper access: ~ it tends to initially slump so some masking up will be required- when dry it can be sanded back to shape- product is also inert to most aggressive fluids. I would think that a thin coating of gasket sealant would also do if you don’t fancy a more involved job.
(J.B. Weld should be in every tool box)
Bob

[Ron Kwas]

Arcturus;

Try to determine from disassembly, if that surface is critical to sealing...does it have a copper displacement washer, or fiber seal?
I don't think this is the precisely applicable x-ray drawing for your HS4(?), but it might allow you to determine if that is a sealing surface, in which case the discontinuities will certainly work against a good seal and allow weepage:

Source: https://www.sw-em.com/checkchoke.htm

It does look like that surface could be touched up very carefully, flat and just through the pitted surface, with a file...check also the circumferential sealing of the "cork gland washer" shown...if sloppy, you might need to renew/replace.

Good Hunting!

[blueosprey90]

Can you place a piece of 350 grit sandpaper on a piece of glass or flat metal and scrape that surface on the paper? Then 500 grit, then 1000?

[arcturus]

Well,if the sealant doesn't work then it's plan "B" a more refined version of the pictured mock up spun in my drill press with light pressure against the mating surface

[Derek UK]

Liquid ptfe sealer is worth considering.

[arcturus]

So far all OK.I used a thin smear of Wurth silicon special 250, the same as I used on my leaking rear cam plug. The new jet assembly and needle has made a huge difference,I'm now able to balance the carbs. Just need a good hard run to read the plugs and fine tune mixture.