A10 carb

[TT John]

I have a A10 Golden Flash, that I rebuilt in 2005 and since then have made several changes to it. now its a 1957 plunger but I have a modified s/a head which is quite different and to get the carb in, so that its not fouled by the frame I had to cut the inlet manifold down, with this being done I managed to fit a concentric carb and using what I think are the correct jet sizes, the bike runs quite nicely acceleration is good etc but when it comes to ticking over, I can get it to a nice steady slow tickover for about 30 seconds and then it just has one spit out of the carb and the engine stops, restart without touching the throttle and it ticks over just the same then cuts out exactly the same.
Any ideas you brainy lot?

TTJohn

[muskrat]

My 1st thought is an air leak or the pilot too lean. When running spray some WD or similar over the flange and note if tickover changes (leak). If OK richen the pilot (air) screw a 1/4 to 1/2 turn in.
Cheers

[TT John]

My first thought was that, so I took out the air screw and fitted new 'o' rings on then screwed it back in but I do believe that the screw is now almost at it's maximum.

Regards TTJohn

[muskrat]

 What size carb and what size pilot jet? Is it a mk1 or 1.5 concentric? the early ones (mk1) had pilot jets screwed in to the body, top of the float chamber. The later had a brass jet inserted (non removable or adjustable) opposite the air screw. If you take the air screw out you may see a brass jet at the bottom of the hole. It has a 0.016" hole.
" I do believe that the screw is now almost at it's maximum." In or out?
Cheers