Page 1 of 1
help air fuel mixture screw side to enrich
Posted: Sat Oct 03, 2020 9:59 pm
by buddy burger
on a buddy 50 (keihin carb) which of screw or unscrew will make it richer? its different from carb to another
thanks!
Posted: Sat Oct 03, 2020 10:51 pm
by tenders
Out is richer, in is leaner.
At least that’s what I carefully made a point of writing down in my notes when I last was fiddling with the carb.
Posted: Sun Oct 04, 2020 8:33 am
by babblefish
tenders wrote:Out is richer, in is leaner.
At least that’s what I carefully made a point of writing down in my notes when I last was fiddling with the carb.
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.
Posted: Sun Oct 04, 2020 12:17 pm
by tenders
I don’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 I’m not 100% sure of that. Both are Keihin carbs. I have an old inboard boat engine that uses a Zenith carb, and it’s the opposite. In stock carb adjustments, you’re usually trying to set it between two extremes of “too rich� and “too lean,� and which extreme is which doesn’t really matter.