'88 175 Yamaha carb confusion

[recess]

Trying to lync and sync an '88 175 yamaha. The clymer manual gives different needle valve setting for different carbs; G501, G502, and G503 for the 175hp motors. My engine shows carbs stamped G505????? The Yamaha shop manual makes no mention of these different carbs.
Any advise would help.

 

[DadTo2Marines]

Re: '88 175 Yamaha carb confusion

According to the manual that I have your pilot screw (low speed idle screw) is to be 1 1/8 to 1 5/8 turns out (I'd start at 1.5 turns out) and the float drop is .61 to .65 if an inch.