Discussion of the Genuine Buddy, Hooligan, Black Jack and other topics, both scooter related and not
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4 posts • Page 1 of 1
I guess the idle mixture screw for a 50cc engine is different from the 125/150cc engines. On my 150, the mixture screw adjusts air flow so turning it IN reduces the amount of air resulting in a richer mixture.tenders wrote:Out is richer, in is leaner.
At least thatâ€™s what I carefully made a point of writing down in my notes when I last was fiddling with the carb.
Some people can break a crowbar in a sandbox.
I donâ€™t have a larger Buddy to compare to but idle mixture screws work in opposite ways in different carb designs. Some control idle air, and some, idle fuel. My notes on my Vespa S150 suggest that its carb works the same as the Buddy 50, though Iâ€™m not 100% sure of that. Both are Keihin carbs. I have an old inboard boat engine that uses a Zenith carb, and itâ€™s the opposite. In stock carb adjustments, youâ€™re usually trying to set it between two extremes of â€œtoo richâ€� and â€œtoo lean,â€� and which extreme is which doesnâ€™t really matter.