My paperwork says 341CH.
I didn't have any problem with the throttle linkage on my Series 3.
I have noticed that Paddocks sell the choke parts for £9-00.
Will let yah know. Wont be this week as MOT's saturday (DUN DUN DDUUNNN!!) and backs killing me/toms pulling 60hr weeks and is a zombie atm. But cheers man