Thread size in the top cap of a 276 carb

[orabanda]

Hi All,
Can someone please confirm the type, size and pitch of the thread for the adjustable cable adaptors which screw into the top  cap of a 276?

Thread is very fine, appears to be 40 tpi.

Thanks,
Rickity Dick.

[morris]

I have measured a couple of spare adjusters I have got.
They came from a 376, but they'll be the same I guess.
Diameter is .216  +- 7/32 X 40 TPI which corresponds to Model Engineering Thread?

[chaterlea25]

Hi
Yup   that's them
I bought the taps and dies to make up adjusters for a much earlier AMAC carb
they had knurled brass instead of hex and then got them nickel plated

John

[orabanda]

Thanks Morris and John!
Time to contact Tracy Tools and get the dies.

Only a few jobs to do before the B31 lives again, and making the carby cables are one of them.

There is very little clearance between the carb top and the underneath of the tank so I intend to make a couple of bends, to reduce the friction on the cables where they enter the carb.

Richard

[trevinoz]

Why not just use "top hat" bushes in the top and in-line adjusters?

[morris]

There is very little clearance between the carb top and the underneath of the tank so I intend to make a couple of bends, to reduce the friction on the cables where they enter the carb.

I did a similar thing on the plunger's concentric.
Only I just drilled out the top cap to 1/4", and used some leftover 1/4" steel/copper bendable fuel line from the Morris which I pushed in the cap.
Works well.