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Isabella ts paitia twin choke carburettor runs rich and I can't find the fuel/air mixture screw to adjust,any ideas please?

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    Gregg Mahin Jul 17, 2018

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6ya6ya

6ya staff

  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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Joe H.

  • 330 Answers

SOURCE: is sputtering and backfiring but from carb. its

You need to clean the carb not adjust it.(unless you already have)The jet can become stoped with trash,or the float could be dealing with debris.remove the bowl clean the parts and try again to run it.Just putting cleaner in the fuel will not remove dirt, bugs, or other trash from inside carb.

Posted on Apr 26, 2010

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gavin jones

  • 1508 Answers

SOURCE: air fuel mixture adjustment 04 honda 125 innova anf

the jetting should not be a problem, perhaps the air cleaner element is dirty or the element even if it looks ok sometimes needs a new one, the smaller motors often rely on the right intake vacumn through the filter for the carbs to work as designed

Posted on May 22, 2010

Testimonial: "yeah i did that and it made an instant difference.thanks again fixya. des obrien"

tombones

  • 3567 Answers

SOURCE: Looking for Air Fuel Mixture

See below. Please rate my answer. thanks.

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Posted on Aug 04, 2010

Testimonial: "Many thanks for finding the part number!"

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gavin jones

  • 1508 Answers

SOURCE: carburettors seem to be running

The air mixture settings dont often change by themselves, its usually a small screw under the carb, and is sometimes blanked over with a alum plug .
as the air filter gets old it can richen the mixture even if the filter looks ok and clean.
the carbs float bowls can flood due to dirt or corrosion as will require a carb overhaul.
If the air filter or exhaust has been changed from standard, this can mean rejetting, the air screws have their main effect at idle

Posted on Apr 05, 2011

cda2z

cda2z

  • 120 Answers

SOURCE: Where can I find the

you wont and you cant ,doesnt have a choke ,its computer controlled fuel injection

Posted on Jun 09, 2011

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1 Answer

I got my carburetor problem fixed but now it runs for a while then starts backfiring it'll shut off let's set for a couple seconds and start right back up can anybody tell me why


That sounds like a fuel/air mixture problem.

Just to confirm .. it is a carburettor, not fuel injection?

As a general rule of thumb (with carburettors..) if it backfires through the exhaust/muffler .. the fuel mixture is too rich.

If it backfires through the carb/air filter, the mixture is too weak.

It could also be a 'sticking' float in the carb.

When an engine is cold the fuel is rich .. lots of fuel .. that's how a choke works.. However, when the engine warms up a rich mixture causes problems. The car may splutter and stall, run sluggish or cut out.

Dec 25, 2015 | Cars & Trucks

1 Answer

The carburettor how to adjust the air and fuel mixture on the carburettor


Find the adjustment screws on the front of the carburetor. Then Start the engine and let it warm to normal operating.
Adjust both screws equally and find the right mixture.Bring both screws up slowly and listen until the engine purrs smoothly. Any raggedness or rattling is a sign of too lean a mixture. Keep turning until you find the sweet spot.

Sep 21, 2015 | Troy bilt Super Bronco Tiller 208cc

1 Answer

How do I adjust the CO and fuel/air mixture


the CO and fuel/air mixture is not adjustable on modern cars , only on carburettors . the engine management system will ensure correct fuelling, if there is a fault with this then in most cases an engine management light will illuminate on the dash board

Feb 17, 2015 | 2000 Daewoo Nubira

1 Answer

Briggs and Stratton hunting and surging.


How about a leak down test?? sounds like blow bye. is it consuming large amounts of engine oil???

Apr 08, 2014 | Briggs & Stratton Garden

1 Answer

I have a 18 hp b&s vanguard engine and it will only run on half choke any ideas


it,s not getting enough gas, your carburater needs cleaned and there's an mixture screw on most engine's hope this helps

Sep 22, 2012 | Briggs & Stratton Electrical Supplies

1 Answer

Starts on full choke but stalls when moved to 1/2 - can play with it to keep ig going for a min or two but dies out.


When you go from full choke (rich air/fuel mixture in carb) to half-choke (leaner air/fuel mixture), you are requesting the engine to do more with less. This is a very common problem. You say it dies out. It is probably at that point dying out "lean" with a lot of air and not very much fuel. Several things can cause it to die out. Bad fuel filter in gas tank, debris in the carburetor fuel inlet screen (small wire mesh filter)...or it could just need the L mixture screw adjusted which afftects how rich/lean the engine is at startup. Since it is dying lean, I suggest turning the L (Low speed) mixture screw counterclockwise to increase fuel flow at startup. Turn it about 1/4 of a turn. If this allows it to keep running, then good. The L and H mixture screws have unconventional heads on them that require a special tool, but you can make your own with a small 22 gauge automotive-type female spade connector. Just tap it down onto the head of the L screw (one closest to engine below the idle speed screw) insert a flat blade screwdriver, and you should be able to turn it. If adjustment does NOT help the dying problem, then the installation of a gasket and diaphragm kit is probably the next step. Good luck, and you are not alone, there are hundreds of these machines that do this.

Aug 14, 2011 | Poulan Garden

1 Answer

1997 Honda XRV 750 Africa twin air-fuel mixture adjustment


Hi, Harrythespid it should be noted that the "AIR FUEL" mixture screw adjustment "ONLY" manages your idle and has no effect on any other circuit also any intake leaks must be repaired before the A/F adjustment procedure can be performed otherwise you will never obtain a proper idle and you will waste a lot of time chasing the impossible. The A/F mixture screw's purpose is to fine tune the fuel charge entering the combustion chamber. The following applies to both 2 and 4 stroke engines:
1. The mixture screw may be sealed at the factory with a Welch Plug please review the following video for removal.
https://www.youtube.com/watch?v=wAXcksgvDkM
2. The mixture screw manages a range of 3 complete 360-degree counterclockwise turns from the bottom/closed position.
3. The mixture screw should have a spring and o-ring for tension and sealing integrity.
4. Turn the mixture screw clockwise until it gently bottoms out, this makes the fuel charge very lean and the engine should not idle if it does then the pilot/idle jet is too big and needs to be replaced with the next size smaller.
5. Turn the mixture screw 1 and 1/2 turns counterclockwise to establish a baseline for starting the engine.
6. To fine-tune the idle circuit, adjust the mixture screw 1/4 turn in or out to achieve maximum idle RPM, wait 15 seconds between each adjustment for the idle to settle.
7. Never go past 3 full turns out this will make the fuel charge rich, foul plugs, and produce black smoke out of the exhaust, if the engine RPM keeps increasing past 3 turns the pilot/idle jet is too small and needs to be replaced with the next size larger.
8. After achieving maximum idle back out the mixture screw another 1/8 of a turn then adjust the throttle cable idle stop screw to 950-1050 RPM.
9. This procedure works great on 99% of all engines, for the 1% that demand a more robust throttle response on aftermarket monster fuel delivery systems additional tweaking outside the box may be necessary.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
XRV750 Adjusting the mixture synchronisation How
Honda Shadow VT700C Running Lean Fix Pilot Jet Needle Shim http://service.tanga-moteurs.ro/data/Honda_XRV_750%28Africa_Twin%29%26XL_600-650_V%28Transalp%29_%2787-02_Service_Repair_Manual.pdf
https://www.partsfish.com/page/oem-parts-for-honda
Honda XRV 750 Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e



Sep 20, 2010 | 1997 Honda XRV 750 Africa twin

1 Answer

I have a Briggs and STatton 24 OHV intek motor on a craftsman lawn tractor. I got it on sale and when I got home it ran rough. The fuel line had collapsed or was plugged with some white powder. I took off...


It sounds like the fuel mixture is running very Lean..There are usually two adjusting screw screws on the carburettor that control the mixture. A Larger one is for the Main Jet and a smaller one for the Idle Jet. There is also an adjusting screw on the throttle butterfly to control the idle speed.
To adjust setup, start with at least a half tank of fuel, and have engine at operating tempurature (That is warm but not overly Hot). As a starting point, loosen (anticlockwise) Main Jet screw about half a turn, to richen mixture,so that engine will run without choke. Run engine at full speed and adjust main jet for highest smooth speed without engine missing due to mixture being too lean or rich.
Allow engine to idle and the adjust Idle Jet Screw for smoothest idle. Idle Speed screw may have to be adjusted if idle speed is too high/low.
Sequence above may have to be repeated to get best running. If engine hesitates sometime when sudden load is applied but then picks up, try adjusting Main Jet by 1/8 to 1/4 turn richer until it handles the load without faltering.

Aug 22, 2010 | Briggs & Stratton Briggs Stratton Intek V...

1 Answer

Hello I have a 1980 Ford Bronco 351 2bbl. Wondering if anyone knows which screws adjust what? Please if anyone has any ideas please respond. Thank you.


Here are some images that might help to assist you, and let me know if you require any further assistance.


Adjust the curb idle with the engine warmed up and the choke off.

421d8f7.jpg


The air/fuel mixture screws should be adjusted with the engine warmed up and at normal idle speed, then turn each air/fuel mixture screw in one at a time until the engine just begins to mis-fire, then back the air/fuel mixture screw out 1-1/2 to 2 turns out a half a turn at a time until the engine idle is the smoothest. (your vehicle might have restrictor caps over the air/fuel mixture screws to limit the amount of adjustment)

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The choke adjustments;

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To adjust the vacuum tension pull on the choke pull-off:

71de89e.jpg



Adjust the fast idle screw to the proper RPM with the engine cold and the choke on.

cadcd19.jpg

Jul 31, 2010 | 1981 Ford Bronco

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