Posted by MarkB_MI on August 30, 2018 at 17:39:59 from (174.230.25.69):
In Reply to: wont run right posted by 1948jr on August 30, 2018 at 15:08:54:
Most carburetors go lean when the throttle is advanced, because there's a lag between when the throttle is opened and when increased airflow through the venturi starts sucking more fuel. Most automotive carbs have an accelerator pump to compensate. Some had "power valves" as well. Motorcycles and some sports cars use "constant velocity" carburetors, where the airflow through the carb is restricted to prevent the mixture from going lean.
Tractor engines aren't expected to respond instantly when the throttle is opened, so they don't typically have accelerator pumps or power valves, nor do they need CV carburetors.
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