The number is usually stamped on the head of the jet. It's super tiny. You may have to get a magnifying glass or use your phones camera and zoom in. Some have it stamped on the head of the jet, some on the side.
I've not seen one without the size on it, but there's always a first.

 

original jets main=112 pilot=35
replacement jets main=105 pilot=35

Perhaps the bike was changed to a 112 and 105 is stock; not sure.

 

Do you have a shop manual? In the front somewhere it should tell you what the stock ones should be.

 

Yes. Stock is 105.

 

Another question. What is the best way to check float bowl level? They give a procedure in the manual with some special service tool that I obviously don't own.

 

It's not too big a deal normally. You can use basically anything that will easily give you consistent results. In the past I've used a cutout of a barcode. They have tons of little lines that allow you to use as a gauge. Not sure about your model but not every series of CRB's float height is adjustable. They either work or they don't. It's important that the spring in the needle is responsive when depressed.

 

Here is a decent video on the subject that uses the bar code idea you recommended.

 

Didn't get the link. Sorry.

 

 

I got the carbs completely overhauled and the new isolators installed. Noticed the carbs sit higher and the air intakes now line up; interesting. Bike is better at idle and seem to run a little hotter, which I think is good since I believe it was not burning fuel and pinging before. It surges at idle every 5-6 seconds. Not big deal, just a bit strange. I still hear flutter when I hold the throttle at 3000 RPM or so, but without load. Will take it for a ride tomorrow. I am still thinking there is something not quite right. FYI: I have a second set of used carbs which look really clean. I tried to run them but the fuel rail was leaking fuel, so I have to fix that first. My goal was to compare the two sets of carbs to see if any common problems still exist which point to a non-carb related issue. I will update after the ride, thanks again for all of your insight folks (well mostly Hamlin).