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The pilot screw setting should be screwed in until it is snug (not tight), then backed out 1 and 3/4 turns.
turn clockwise till stopped, then 1 1/4 turn out is the basic setting
The only setting is one screw on the top of each carb its the mixture screw and should is 1.5 turns out by default.
In transcribing medical reports a muc screw is a multi-use compression screw. It is an acronym for a specialized compression screw.
screw it all the way in and then back it out 1 1/2 full turns and begin adjusting from there.
how to adjust air fuel mixture on yamaha sh50? Is the screw an air screw (in to richen) or a fuel screw? (out to richen)
30 years of working on motorcycles, there is no exact setting what you do is turn the mix in until you hear the motor change, if it picks up rpm this is fine just keep turn until the rpms reaches its top then turn the idle screw down,
take the side pannel off and there is a knob on the end of a rubber tube that does this for you. turn right or left to get the Idle that you want.IF it is missing or has fallen off it will be on the left side and towards the front to bottom of the Carb.Good luck.
On the side of the carb.
With a screw driver
The optimal setting for a pilot screw on almost any bike is one and one half full turns out from the closed position.
M5x80