![]() The adjuster screw is needed as engines move outside the optimum AFR as they age or after major engine repairs, such as re-bores, but temperature, elevation, and humidity will affect it too.Īn engine usually bogs because it’s running too rich, but a lean running motor is often described as bogging down too. The carburetor is calibrated and tuned from the factory but is fitted with an air/fuel mix adjustment screw. And it’s the job of the carburetor to make sure this ratio is maintained. That means your engine is at its happiest when the engine gets a mix of 14.7 parts air (oxygen) for every 1 part gas. This has a Mikuni carb and I am sure I read somewhere that they don't have a air/fuel mix screw - it is preset and been the cause of problems for other people.Your engine runs at its best when the air-to-fuel ratio is 14.7:1. Thank you Frank, I did inspect the jets and could see through them properly which I could not before the ultrasonic bath. Lastly what made you think it was the carburetor in the first place? What pointed you in that direction ? Had the bike been sitting ? You may have to figure out a way to turn that air/fuel screw or make up a small angle screwdriver while the bike is running. And adjust from there either in or out, which ever way the bike runs better while the bike is running and the air cleaner is installed. ![]() Did you remember where the air/fuel screw was set at before you broke it down? If not set it at 2-1/4 turns out from a snug position. Use air to blow out all the orafaces. The float may be getting stuck and that may be your reason why fuel is not getting up into the carburetor. You may have to pull the carb off again and clean it out using a small piece of wire to get inside the jets. The ultrasound cleaner is great but will not get everything cleaned.
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