Originally posted by rodbolt17
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OK, seems we are not communicating well on which air to fuel ratio we are talking about.
I believe you are talking about the ratio of air/fuel going thru the pilot screw/ jets/ passages. And that ratio cannot be changed by turning the screw
I am talking about the air to fuel ratio going into the cylinders to be burned, which can be changed by lessening or increasing the amount of pilot screw turns allowing more of less of that mix into the motor to mix with the air going in also.
If the air fuel ratio is 14.7-1 going thru the pilot screw passage and it mixes with the other air coming thru the carb throat it will be way to lean would it not./
I have seen throttle plates with holes in them to meter the air in instead of cracking the plates open just a little.
And I can understand them allowing a fixed amount of air when the plates are closed completely but most carbs I have seen use the idle speed screw to adjust the speed/amount of air in.
On the small 2 stroke motors I prefer the ones with high and low speed screws to adjust the amount of fuel
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