Mixture screw thread stripped

[iggulden76]

I have a dellorto si 24mm carb and the thread where the mixture screw threads in is stripped. What do you suggest i do?
Thanks

[iggulden76]

Have thought of maybe getting it helicoiled?

[Perkin]

Hey, didn't you write The Dangerous Book for Boys?

Not sure what you'd do with your carb, tbh... How did that thread get stripped? Have you tried a different screw?

Maybe you could close the hole up slightly using a small bolly and a hammer...

[iggulden76]

The thread was striped when i got the carb. have looked at the carb today and its actually more cross threaded than stripped?

[Perkin]

Maybe someone has tried to force in the wrong screw.

You could try & obtain a new one...

I have a PX carb but I think it's a 20mm.

[iggulden76]

thanks for your replies. think im gunna look into getting to helicoiled, think thats the only thing i can do now?

[brainspk50s]

Can you not cut a thread size one up and use a new screw

[iggulden76]

would i be able to get a mixture screw the correct size?

[Perkin]

For a precision job like this I'm guessing a helicoil wouldn't be ideal... Maybe something like a nylon sleeve glued in.

You'd have to cut the hole to the O/D of the sleeve and remove all traces of swarf.

Makes you wonder if it'd be easier to just locate a new carb. If you want to use a proper (non-box) carb, I have a manifold.

[iggulden76]

hmmm il have a think. thanks for your help

[jum]

hi if its just cross threaded get the right size tap and re tap-it done this on a 30mm delli i got of flee-bay

[iggulden76]

ok thanks, will have another look tomorrow

[iggulden76]

thanks for everyones help, managed to find a slightly bigger screw and wound it in and it cut its own thread ;D

[Perkin]

Great; hope it works OK.

[iggulden76]

its running much better now, just need to re jet it as it bogs down slightly in first and second. it is a standard px125 with a expansion exhaust, atm it has a 120 main jet. what size do you suggest i change this for?
thanks