OMC A carb adjustments

[Skoontz]

OK, since it has been forever since I have rebuilt OMC carbs ( back in the day there was a high and low speed adjustment needle made of brass)

I got a question. At testing, KT's motor was running sluggish from the start, and would not idle under load below 1800-200 RPM. I opened the low speed needle until I saw a significant change, then everything seemed better, but the engine still would not idle any lower.

I remember the fishing engines we would tune up could run 750-800 while the gearcase was in forward all day long.

So, after testing I decided to be scientific and count how many turns the low speed needle was out from the seat. I got 3-3.5 turns out.

We used to run somewhere between 1.5-2 turns, and that provided good idle with decent acceleration, so, I boiled the carb, blew it out and rebuilt it.

Question being is, what is the correct starting point for adjustment on the OMC 15? And, is 3-3.5 turns out abnormal?

Thank you again for the replies, this is a serious learning curve for us.

[Kev43V]

I think you want to be closer to the old numbers than what you are running now (just my 2 peso's worth)

[Skoontz]

That's what I'm think as well, Kev....

To the lake we go!

[johnsonm50]

I doubt the idle screw has much to do with it if its sluggish up the tachometer, sounds more like a good cleanin like you did is the Rx.