New carb, it bogs down at full throttle, is this a jet problem?

Try going with a slightly smaller main jet. Sounds like it is getting too much fuel at WOT.

Is it blowing black smoke like it is running rich? You say it is running great as long as you don't open it up, so I would guess that your air/fuel mixture screw is close on, but your main jet is just too large...

Sounds like a lean condition. Try going back to old carb and see if problem still exists. If it runs OK on old carb, it indeed may be jet size problem in new carb.

When re-jetting, I use trial and error. If you are careful, jets can be drilled to next largest size(s) using small drill sets available at MSC Industrial supply. Check out drill sizes #1 through #80. There are charts that indicate how large a hole these small bits make. For example: # 58 bit will make a 0.0420 hole.

Knowing what size your jet is will help as a starting point. You will probably need something in or around #55. Use appropriate pin vise as jets must be carefully drilled out by hand and burr free. Use a jewelers loupe to inspect.

Contact me for a carb trouble shooting guide.

It will explain what adjustments to make to repair running conditions.

With the guide, you might be able to figure it out for yourself.

also have a look at your air cleaner