Thanks RCIGN1 for your help. The carb is a Walbro and the marking is WT3.
I don't know if it is the original carb. You mentioned doing a cross referance.
Is that something I can do? If yes, how would I proceed?
Thanks again for your help.
Paul Ryan

PS I think that this section of RC Universe is the best thing on the net, great people and great information. Playing (working) with these small engines is a hobby unto itself!