What each of the screws adjust?

Asked by Chuck on 07/28/2008 1  Answer
5 facing the screws: LEFT is idle mixture and RIGHT is the main mixture... in my experience, the both get adjusted about the same :P if the main is too rich, the idle can be leaned .. and vice versa... the manual says to start with both turned in all the way and then backed out 1 full turn each..this should allow it to run... adjust the main (right) either way until it runs bad.... then adjust the other way until it runs bad.... set in between those number of turns... then the same goes for the idle mixture... its a lame answer, but thats how i adjusted mine and it works heres the Tecumseh motor manual for the Toro s-200 and s-620
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