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I have a Briggs 11 hp engine on my new to me JcPenney model 1849 l181d rider mower. Is there a standard mixture setting to go by? It has one under neath the float bowl that I have at 1 1/4 turns and one on top that is currently set around 2 1/2 turns. I assume the one on top is for low speed? and the on underneath float bowl is the main one. It has an aluminum bore I think. \

any help is appreciated. thanks.
 

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1 1/2 on each is staring point. Then adjust top for fastest idle, then lower one for best high speed. I usually go a bit back out from best on lower so a bit richer for when load is added.
 
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