Even easier use an old credit card.

There's a template to do just that someplace on this site.

Do a search.

 

I just use an old business card, mark it with a pen, then measure. Cheap and easy, especially when dealing with multiple bikes with different measurements.

 

I purchased a float level gauge from K&L supply back in the 90's;it's nice to have it adjustable both for width and height w/ metric 'mm' graduation marks.I also cut a little slot into it on the bottom where it meets the carb bowl mating surface so it sits directly onto the carb. bowl gasket surface to give me the correct reading.I've never used the 'clear tube method' which is probably more accurate but requires different pieces to screw into the carb.bowl drain screw so fuel will flow into a small graduated clear tube.
I bought the clear,graduated tube from the Kawasaki dealer to use to do that 'clear tube method' years ago and still have it in the top drawer of my roll-away wrapped in it's orig. packaging... I guess I'm just into using the float level gauge because it's what I always did and it worked well for me.

 

I did a search, but the link is dead.

http://www.hondatwins.net/forums/56-fuel-supply-carburation/29615-printable-credit-card-float-adjustment-template.html

No problems, I'll work this one out by myself.

 

An adjustable float level gauge is still possible to buy,a good investment if you do lots of carb. work on different engines.

 

Before I take the carbs off I am going to try fitting a piece of clear tube to the carb drains.

That way, I can at least see if both carb fuel levels are set the same. At the moment, it is running rich on the right hand cylinder, so this ought to tell me if that's down to float level or a different issue.

DOH!

The brass spigots on the carb bowls are of course the overflows, not connected to the drain screws. Back to the drawing board ....

 

And another reason for sticking to the FSM.

Honda says 21mm

Haynes says 27mm (Haynes manual with CB200 on front cover), in the main body of the book, although it does say 21mm in the CB200 supplement at the end.

 

I believe it's 27 in the sloper carbs (KO) but 21 in the others.

 

The adjustable gage would be nice if you work on a variety of carburetors. I made a gage for my CL350 from an old CD case:



It's crude but effective. I measured with the stick on my calipers and filed the last little bit to get it right on size. The main advantage is that you can measure both floats simultaneously.