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hmm something called varnishing happens when gas vehicles with carburetors sit too long, if the car has been sitting a while(year or so) the gas leaves a coating(the additives in the gas gel up and coat the inside of the carb) and can affect the power. You should pour some Sta-bil, or whatever 4 cycle gas stabilizer you can find in your gas tank to try and clean it out like that. Or, you can take your carburetor off and soak it in a bucket of carb cleaner, just make sure to get all the cleaner out before you put it back on the engine.