I measure it as 34mm but it could be 32 as it as 32 on the side. The choke & tick over screw is missing. There maybe other bits missing, this is how it make to me so please study the pictures carefully, comes as shown in pictures, see all pictures for condition.This is a used part with the usual wear and tear, marks, scratches, rust etc SEE ALL PICTURES for condition. For more information or any enquiries please call 01524 734378. You are welcome to come and view but please arrange a time and date first.