I have a 2004 Hondaa 2417 with the Gcv530 engine. I bought it with the engine hunting up and down. I thougt a good cleaning of the Carburettor would cure it. No such luck, got a carburettor of ebay , just the same. Took another carburettor i had and cleaned it from top to bottom , all jets out and cleaned, still the same. I got another carb of Amazon and fitted it last night, although it runs a bit smoother it still revs up and down. I have changed the gaskets between the carb and spacer and between the carb and the air filter, still no joy. The lawnmower was lying up so i also drained the tank and changed the fuel filter (non genuine). Cant figure it out , usually a good carb clean or replacement cured all ills with these gcv530 engines. Did anybody ever come across the spacer between the carb and the engine give trouble?