The float on the K2-K6 is 20.0mm. You need to disassemble the carburetor and invert it with the float upside down to correctly adjust it. Check your manual for complete instructions.  I also think it is important to check both sides of a double bulb float as one side can easily differ from the other.

Here's a video I ran across of a guy adjusting one similar to the ones on our little bikes.

http://www.youtube.com/watch?v=CHnOnfNwLyQ

Found this as well.....

Fuel level. The fuel level is controlled by the fuel floats and the fuel float valve. The floats are hollow or made of something that will float on gasoline, such as cork. Part of the float presses against the float valve, sometimes called a needle and seat. Most times the part of the float that touches the float valve needle is bendable so you can adjust the level of the fuel in the floatbowel. All plastic floats are not adjustable. If this level is way too high, gas can leak out the carb overflow tube or into the engine. If fuel gets into the engine it will thin out the engine oil, ruining it's ability to lubricate. This will, sooner or later, blow up your engine ! If a full tank of gas in the evening turns into a half tank by morning, check your oil. If it's thin and smells like gas, change it and replace your float valve and/or check your fuel level. If the oil is OK, check under the overflow tube. If it's OK, then check where you are parking your bike 'cuse someone is walking away with your gas !

If your fuel level is just a bit high, the mixture will tend to be a bit rich. If it's low, the mixture will tend to be a bit lean. This is because a high level takes less vacuum to suck fuel into the engine and a low level takes more vacuum to do the same.

Doug - Olympia - Washington
 I don't know how many CTs I have.
Last Edited By: Doug Feb 27 11 7:12 PM. Edited 1 times.