For air bleed adjustments, is "open" clockwise and "close" counterclockwise? Thanks . . yet again.


And, if the idle is is too rich, I want to lean it just like the high end, right, only difference being that leaning is counterclockwise?


Actually, I think I answered my own question. Opening, traditionally known as "counterclockwise" allows more air to bleed in, thus leaning out the low end. Conversely, closing it, "clockwise" does not allow as much air in, thus richening.

That's right. Opening an air bleed adjustment screw leans the mix by allowing more air into the carb. Most air bleed carbs I've seen need to be run with the air bleed completely open or the air hole even drilled out with the next-size-larger bit. They tend to run rich.

Dr.1

Dr.1, it's nice to see somebody else go on record about it. I've encountered that several times, and the local wisdom has inquired of me "So, you think you know more than the manufacturer?"

If you open the airbleed all the way and still have a rich stumble on acceleration from idle... be assured you can drill that passageway out. If necessary, you can still block most of it with the screw.

Best wishes,
Dave Olson

I've always said that, "Scar". Basically, I just do not like air bleed carbs. The low end adjustment is gross and not fine enough to get a really good transition or a reliable idle. Two-needle carbs are found on more expensive, more powerful engines, and for a good reason.

Dr.1

As long as we're throwing in observations about air bleed...................

Keep in mind that the adjusting isn't linear. When the screw has moved about 1/4 into the hole until the hole is about 3/4 closed, each turn closes a LOT of hole compared to how much is closed when the nose of the screw is at either end of hole.

If you plan to adjust an airbleed, it's usually a good idea to look into the hole before you start. Get an idea where the nose of that screw is in the hole before you start. You'll be glad you know where it started if you want to start over. And you'll have an idea how sensitive, or insensitive each 1/8 turn of the screw is going to be.

You also might discover with that look why the idle is doing what it's doing. Grass. Solidified oil. Previous fiddling closed it already. The screw is not in the hole at all. Lots of things.....

Good points, "da Rock".

Dr.1

And I don't mean to re-state the obvious, but with some of the questions I see . . . Always make adjustments to the low speed needle/air bleed with the engine OFF!

And I don't mean to re-state the obvious,

Nothing wrong with restating safety, "jagnweiner". It's better than restatnig your location to the 911 dispatcher.

Dr.1

Yeah, I figured out the obvious after taking the tip of my finger off. Nothing like picking up a piece of your finger~!

Oooh, I feel your pain. [:@] No, really I do. Only it wasn't just the tip. A year ago, I took off 2" of my left index finger with a table saw and also got a good whack at the thumb. [SQUEEMISH WARNING] Nothing like riding 10 miles to the ER with your finger hanging by 1/8" of skin and sitting in the palm of your hand. That's why I don't mind making the occasional safety observation. Your life can change in an instant of carelessness.

Hope your recovery went well.