If you have put diesel in, disconnect supply pipe to injector and allow to drain, flush through with fresh petrol. Reconnect pipe and crank engine over, will take some time but should start, if it doesn't you may have to replace the spark plug, as the diesel will have gummed it up. Will smoke a bit when it starts but will clear. If you have just filled up with the wrong grade of petrol, just fill up with correct grade and run it through, shouldn't be a problem
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If you have put diesel in, disconnect supply pipe to injector and allow to drain, flush through with fresh petrol. Reconnect pipe and crank engine over, will take some time but should start, if it doesn't you may have to replace the spark plug, as the diesel will have gummed it up. Will smoke a bit when it starts but will clear. If you have just filled up with the wrong grade of petrol, just fill up with correct grade and run it through, shouldn't be a problem