1997 Evinrude 175hp needle valve replacement

[crashpro]

I have 1 1997 Evinrude E175GL-EUE and my carb bowls were leaking. I bought new needle valves to replace them while I have it apart. I just removed the plastic part of the carb from the metal part of the body that includes the butterfly assembly. The needle valve is in the part that I left attached to the manifold. How far do I screw in the new needle valve? The spring is completely compressed before I feel any resistance at all. Thanks folks.

 

[Chris1956]

When you say "needle valve", you mean "Idle mixture adjustment screw", right? The spec for a '98 Johnny 175HPV6, 60* motor is 5 turns open from lightly seated. I would expect your engine is the same....

 

[crashpro]

I read in the manual for my motor and it said 4 turns out from lightly seated is the starting point. The tension spring completely compresses before there is any feeling of seating at all, thus I have no reference point from which to back it out four turns. Everything refers to the needle valve just as that. A needle valve. I know it affects the mixture, but I have no idea at what point and now that I have it running, how to properly set them. I used a digital caliper to measure the distance between the shoulder of the needle valve to the body of the carb. I set the new ones at the average of all six old ones.

 

[Chris1956]

OK, that begs the question...why did you replace the Idle mixture screws? They are not normally replaced. Also, did you receive the correct replacements?