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All carburators work axcitly the same . The float level is dertermined by the amount of fuel in the float bowl . When the fuel level reaches a point in the bowl the floats rise and shut of the neddle valve until the engine can draw enough fuel out of the bowl to drop the floats so the neddle valve opens again to supply the bowl with fuel to make the engine run its fool proof . If your haveing an over flow issue where fuel is running out the tube on the sides then pull the carb and clean it you shouldn;t need any parts just a can of carb cleaner and always clean the air filter that how dirt gets in .Good luck with it
turning the screw way out makes the mixture lean, so the problem must be the carb is too rich. check all the jets were installed correctly when the carb was cleaned make sure the carb float bowl is not flooding. Check the fuel tap is working correctly. make certain the airfilter is clean. check the engine has correct amount of clean oil( not fuel contaminated)
You need to remove the carburetor ,take the bowl off, and locate the slow speed jet/circuit and clean it with carb cleaner and blow through it. Once the dirt or varnish is removed it should start and idle like before.
The header says it is a 2004 YZ250F. That's a four stroke and gets no oil in the gas. Your 83 model is a two stroke. As far as the oil and gas mix, 32/1 is the proper mix. That's 4 ounces of two stroke oil per gallon of gas.
DO NOT USE STANDARD MOTOR OIL IN THE GAS.
Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. Any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ). Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.
Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the two screws on the outside throat of the carb and spray into the screw holes as well. < < READ CLOSELY > > Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Be sure the bolts are tight. Let the float bowl fill then start the engine. Set the idle speed with the idle screw. This process should get you back on the road. Please rate this solution. Thanks macnevind!