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I used to do a quick engine overhaul by removing the air filter then dribbling a glass of water through the carb. You had to keep the revs up, but the steam produced during combustion would scour the exhaust valves and ports and blow everything out the exhaust.
Got that tip from a US book from the 60's, with 100 tips to improve fuel consumption. Seemed to work and never done any harm to the engines I used it on. After all, for every gallon of petrol you burn it produces 1.52 gallons of water.
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