Have you checked the float level? Jetting is pointless until you have verified that you have the proper float level. Mine (trailmaster 150) was set at 18mm from the factory.
Here is an excellent write up w/pics on how to set your float level. Even if you know how, it is worth checking out. It is a motorcycle carb, but the same rules apply.
http://www.allthingsmoto.com/forums/...mentary-13608/