I had the same problem with the same bike... if the bike is not very old then it should be the mixture gage which is a gold screw looking thing, on the right hand side of the bike, so it mite jus need adjusting and then need the throttle cable adjusting after as it changes the rev count aswell, jus keep adjusting it and then trying it again, if its reasonably old then it is most probably the carb. Hope this helped u out...
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there is a float in the carb, that pushes up a needle valve to shut the fuel off, There must be something, a little dirt or hair stopping the valve fully closing. The bottom of the carb must be removed and the valve cleaned, It is possible to buy a new needle valve if the problem persists.
You may be able to loosen carb clamps and twist it sideways to get the bottom off, otherwise the carb will need to come off, you should be able to leave the cable and slide installed.
I know you have cleaned the carb but ya gotta keep at it. The jets are not the problem. The problem is the little pilot circuits for low and early mid range fuel supply. Varnish or trash in the carb can be very hard to get rid of.
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 ).
Remove the carb and then 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 idle screw and the air screw on the outside throat of the carb and spray into the screw holes as well. Be liberal with the spray. Also use compressed air to blow out the passage ways. < < 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. Before putting the slide back into the carb, move the clip on the jet needle down one notch. Put the rest of the carb back together and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road. Please rate this solution. Thanks!
Do you have points or electronic ignition ? If points fitted I'd say the gap needs reset or a new condensor fitted. If electronic it sounds like the igniter box is defective. Make sure spark plug is good and that lead is correctly attached to plug cap.