Thanks guys. I think I will leave the brass bit where it is as the flange of the carb is really warped and I think this is where air is getting in.

Kind regards

Pat

email (option): sacombsashtrees@hotmail.com

the flange is the bit that connects the carb to the cylinder head with 2 holes in it for the stud to come through and a washer and nut to hold it onto the cylinder head

email (option): roger.beck@node6.com

A wrong size nut can also give a wrong mixture. For a sidevale you need the lowest, at least for a BSA.

Henk

email (option): ahum@quicknet.nl

My nut looks more like the middle one.

I will see if I can get the shorter one.

Kind regards

Pat

email (option): sacombsashtrees@hotmail.com

I have been riding around with the wrong nut on my 1942 M20 for a pretty long time and had overheating problems all the time especially during the warmer period of the year. It took me a long time to figure out that it was this part that needed to be replaced.

Henk.

email (option): ahum@quicknet.nl