Posted by Bob M on April 19, 2011 at 08:16:14 from (67.240.171.41):
In Reply to: Re: SH exhaust leak posted by Dean Olson on April 18, 2011 at 19:12:41:
You got it Dean!
However in order to start a cold engine with an updraft carburetor, a "blip" of the choke is usually required. This results in an excessive rich condition - and thus sooty exhaust - for the first few revolutions of the engine.
Leaning the carburetor will not change this. Rather it will make MORE choke necessary to start So you will still get a sooty puff of exhaust. Also leaning the carb will cause running problems (stumbling, loss of power) while running.
As long the engine starts easily and runs well once it's warmed up simply leave it alone. (Consider instead the momentary sooty exhaust a "feature"!)
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