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FZS600 Fazer / The problem of synchro of one carburetor. The idle speed of the engine increase
« on: 16 April 2023, 01:31:19 pm »
I've had the Fazer 2003 for a few years now and never had a problem with the carburetors. Service of carburetors and valves was 3 years ago. I have changed spark plugs and filters. The only reason why I decided to do a synchro is that the moto during the first ride this season sometimes from lower revs reacts lazily to unscrewing the throttle, which personally bothers me. The bike runs fine at idle. During the synchro, I was able to balance carburettors 1 and 2 without any problems while maintaining the recommended idle speed. The problem with carburetors 3 and 4 is that on the 4th cylinder from the start the readings were very uneven, so it took a lot of turning the screw to even them out. It is possible to balance all 4 carburetors, but the problem is that then the engine idle speed increases to 3000 or more. And I can't reduce it because the idle screw in the carburetor is already unscrewed to the end. I suspect there is a problem with the fourth carburetor but I don't know what it is. In the video below is the last acceptable setting where the engine idle speed is still normal. The pointer of the fourth vacuum gauge previously was all the way to the upper green "Normal" field.
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