Air bleed screw?
Keith Jacobs
is ID'd as the throttle stop screw, and the other is called the air bleed
screw. I know what the throttle stop screw does, but what does the air
bleed screw do? More importantly, how does it affect engine performance,
and where should it be set? The manual gives it no mention, other than it's
name.
Keith
Eric Wenger
bleed works just opposite the needle type in that counter-clockwise
(un-screw) leans the mixture and clockwise richens the mixture.
A good place to start is to have the screw cover 1/2 of the air-bleed hole.
If your engine dies during a long idle, richen the mixture slightly until
you get a constant idle. If you transition is a little slow from low to
high throttle, lean the mixture slightly.
Good luck!
Eric
Mathew Kirsch
The air bleed screw controls the amount of air that reaches the carburetor
when the engine is at an idle. It is another method of controlling the
fuel mixture at idle (the other being an low-end needle valve).
These are directions from my Tower 40ABC, which also has an air-bleed carb.
Bring your engine down to an idle, and let it idle for a minute. Then jam
the throttle to full open and observe what the engine does. Shut down the
engine before making any adjustments.
If it sputters, then accelerates, the idle mixture is too rich. Open the air
bleed screw 1/8 of a turn (counterclockwise) to allow more air into the idle
mixture. Try the test again.
If the engine sounds flat, or dies outright, your idle mixture is too lean.
Close the air bleed screw 1/8 of a turn to allow less air into the idle
Dr1Driver
The airbleed controls the air/fuel mix at idle. Unfortunately, it doesn't work
very well, and should be left completely open. Even at this setting, the
engine might idle rich and you might have to drill out the bleed hole.
Dr.1 Driver
"There's a Hun in the sun!"
Keith Jacobs
idle, it would either loose lots of revs before picking up and going to full
bore, or it would just die completely.
Thanks for the info!
Keith
Mathew Kirsch <kir...@tallgeese.dynodns.net> wrote in message
news:nogU4.114$%P.3...@typhoon.nyroc.rr.com...
<snip>> The air bleed screw controls the amount of air that reaches the
Keith Jacobs
though!
Keith
Dr1Driver <dr1d...@aol.com> wrote in message
news:20000516165946...@ng-fh1.aol.com...
JohnG
If it's like my .25 FP, theres a hole thru the carb body to let air in
when at low throttle. The air bleed screw is threaded thru this at a
right angle, so that when it is screwed in, it cuts off the
air bleed completely. when unscrewed, it opens the hole to adjust the
idle mixture. Mine
(and I hear many others) had a problem in that the bleed whole isn't
big enough. That is, even when the screw is completely open, the idle
is still too rich. This can be fixed by taking out the
air bleed screw, packing the carburetor body with a twisted paper
towel, and drilling the hole thru with a 1/16 bit. Deburr it and take
care not to get any shavings in the carb. This will give precise
adjustment of the low end mixture.
John
Keith Jacobs <krja...@NOSPAMPLEASEhotmail.com> wrote in message
news:iJVT4.165$fe2....@198.235.216.4...
> I have an OS MAX FP .35 engine. There are two setscrews on the
carb. One
> is ID'd as the throttle stop screw, and the other is called the air
bleed
> screw. I know what the throttle stop screw does, but what does the
air
> bleed screw do? More importantly, how does it affect engine
performance,
> and where should it be set? The manual gives it no mention, other
than it's
> name.
>
> Keith
>
>
Vance Howard
fiddled with the airbleed screw. This engine is my most reliable engine
--
Vance Howard
AMA # 567824
ICQ # 44577585
Slyngel
Slyng
"Vance Howard" <howa...@worldnet.att.net> skrev i en meddelelse
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