SOURCE: This bike in a gray import from the US it is a
First thing > install a new set of the stock NGK spark plugs for your bike. Clean or replace the air filter. Go ahead and drain the carbs. There should be a screw on the lower side of each carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carbs to fill with gas. If the bike doesn't start and run properly then shut off the gas and remove the carburetors from the engine.
For both carbs > 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.
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. Remount the carbs.
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 ). Turn the gas back on and wait a minute for the carbs to fill with gas. Be sure to balance and sync the carbs when finished. If you don't know how to balance and sync the carbs, get back to me after you do the stuff mentioned above. This process should get you back on the road.
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