I have a question about my Saito FA 72B. I have searched all over but can't seem to find out what I am looking at on this engine. It has the normal low speed and high speed needle valves, but on the top of the carb there is some other adjustment screw, which I took the liberty of drawing an arrow to, which is mainly for my sake in case I can't find it in the future, but I digress. This part is not identified in the owners manual, though appears to be sketched into the exploded view of the carb, but there is not a part number. It's a phillips head screw within a spring. I apologize if this question has been asked previously, I could not find an answer here, nor elsewhere on the danged ole internet. Any help would be greatly appreciated. As for now, I plan to pretend as if it doesn't exist. Thanks much.
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