MotoPartsPakistan 

In carburetors, fuel is filled in the carburetor bowl and then supplied to the jets. there is a set level that is maintained to assure a sufficient supply of fuel to the jets. and that level is adjusted by afloat. when the bowl is filled up the float raise and closes the valve that supplies the fuel and then as the fuel is consumed the fuel level drops with it the flot goes down and that opens the fuel valve again to replenish it.

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Float Hight is too high: if the float height is too high that will raise the fuel level in the carburetor bowl. if it is raised too high then the fuel will leak into the engine uncontrollably thus causing a rich condition.

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Float level is too low: if the float level is too low then on high speeds the carburetor bowl won't replenish enough to reach the main jet. this will cause sudden power drop or hick-ups at full throttle. normally if the float height is low then the engine will run leaner .and  the spark plug color will appear white.

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adjustment: 

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Rule No.1: on most carburetors, the float height is set adjacent to the carburetor body. but float height varies from motorcycle to motorcycle. so always consult the service manual for guidance.

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Rule No.2: place the carburetor on the side. float side facing right. then tilt the carburetor to the left at 45 degrees angle. most carburetors are adjusted on this angle because at this angle float is hanging free and you can adjust float height better from this angle.