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Donna Ladet Posted on May 23, 2015

Where is mixture adjustment on B/S 20 hp v-twin carburetor?

5 Related Answers

Anonymous

  • 1 Answer
  • Posted on Jun 07, 2009

SOURCE: Need carburetor adjustment

I had a similar problem with my 23 hp briggs. While cleaning the carb I found that the great gas we get today had eaten the seal around one of the jets in the throttle body causing it to fall out. Replaced the jet and now runs like a champ. Hope this helps.

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Anonymous

  • 225 Answers
  • Posted on Jun 21, 2009

SOURCE: carburetor adjustment

have you checked the air filter,if that is clean I think I would replace the carb, diaphram.

Anonymous

  • 4088 Answers
  • Posted on Jul 04, 2009

SOURCE: Carburetor initial adjustment for Poland 2150

Both about two turns or so. Engine must be warmed up to properly set the running adjustments. H adjustment to get four-stroking with no load, but immediate smooth out with light load (cutting wood). Idle set for smooth idle, but allows immediate pickup from idle when throttle applied.

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Steven

  • 71 Answers
  • Posted on Sep 28, 2010

SOURCE: The owners manual for my

The Low speed adjustment screw is the one marked as "L" and would be adjusted during:
1. Idle - to insure running smoothly, and
2. Acceleration - to transition from Idle to High Speed.

The High speed adjustment screw is the one marked as "H" and would be adjusted during:
1. High speed or Wide Open Throttle. Turn about 1/8 either way to gain top RPM's and then back off slightly.

The final screw is an Idle Set screw. This screw sets the actual speed of the Idle and is the screw attached to the end of the throttle cable as it terminates at the carburetor. Turning it:
1. Clockwise - increases RPM's (speeds up motor)
2. Counter Clockwise - reduces RPM's (slows down the motor)

hunter19_46m

Curtis Sewell

  • 7482 Answers
  • Posted on Jul 09, 2011

SOURCE: What is the high /

Hi dcheddy...

Before you remove or try to adjust your low and high speed jets you should always count the number of turns it takes to lightly seat the idle mixture screw and high speed needle adjusting screws.
Be sure to write the number of turns down on a piece of paper so you will know how many turns from the seated position to open the jets when you go to reinstall them, or if you remove them for cleaning or replacement.
If you have tried to adjust them already then this should get it running...then do your final adjustment when the engine is warm.
Normally you will adjust your idle jet to 1/2-3/4 turn open from the bottom seated position.
Then you will re-adjust the low speed of the engine when the engine is warm by turning the idle screw in or out till the engine runs smoothly at idle speed, around 1200 RPM.
The high speed jet is adjusted to 1 1/2- 1 3/4 open from the bottom seated position, after the engine is warm.
Then re-adjusted by turning the High Speed jet adjustment screw in or out till the motor runs smoothly at high speed.
Alway use the "lightly seated" method if you have not changed the screw settings.
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0helpful
1answer

I have a 1980’s 2 hp Evinrude out board motor. What oil/gas mixture is. Recommended?

Depends on the type of oil you choose, there are several different oils 20:1, 40:1, 50:1, due to the age I would start with 20:1 oil, the worst that could happen is it would run with an oil rich mixture, be sure and use lead free gasoline if possible. all of the oils will work, but due to the mixture it affects the amount of gasoline going through the carburetor jet. More oil less gas, less oil more gas.
Mar 27, 2018 • HP Garden
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Small engine problem. I have a 3.5 hp Briggs and Stratton engine that runs very roughly. The fuel mixture screw makes no difference, all the way open or all the way off. The model is 91212 0196 01.

The fuel mixture screw only regulated the air and fuel at tick over. normal running is governed by the main jet needle and slide. Check spark plugs, clean carburetor and check timing. Also check for manifold leaks

An air fuel mixture screw is a special screw on an engine's carburetor that controls how much air mixes with the fuel. Adjusting this screw changes how fast or slow an engine idles and how smoothly it runs.

How to Adjust an Air Fuel Mixture Screw: 7 Steps (with Pictures)

Fixes and videos

https://www.google.com/search?q=briggs+and+stratton+3.5+hp+running+rough

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0helpful
1answer

I have a Briggs & Stratton Vanguard 16 HP motor. It idles fine and it runs OK at high RPMS. But it backfires thru the carburetor during accelerating. Any suggestions?

On some float-type carburetors, you can adjust the air-fuel mixture and engine speed at idle. Check for an idle speed screw designed to keep the throttle plate from closing completely, and an idle mixture screw that limits the flow of fuel at idle. If your carburetor contains these screws, proceed below.
  1. With the engine off, remove the air filter and air cartridge.
  2. Locate the idle mixture screw and turn it clockwise until the needle lightly touches the seat. Then, turn the screw counterclockwise 1-1/2 turns.
  3. If your carburetor has a main jet adjustment screw at the base of the float bowl, turn the screw clockwise until you feel it just touch the seat inside the emulsion tube. Then, turn the screw counterclockwise 1 to 1-1/2 turns. Replace the air cleaner assembly and start the engine for final carburetor adjustments.
  4. Run the engine for five minutes at half throttle to bring it to its operating temperature. Then, turn the idle mixture screw slowly clockwise until the engine begins to slow. Turn the screw in the opposite direction until the engine again begins to slow . Finally, turn the screw back to the midpoint.
  5. Using a tachometer to gauge engine speed , set the idle speed screw to bring the engine to 1750 RPM for aluminum-cylinder engine or 1200 RPM for engine with a cast-iron cylinder sleeve.
  6. With the engine running at idle , hold the throttle lever against the idle speed screw to bring the engine speed to "true idle." Then, repeat the idle mixture screw adjustments from Step 4 to fine-tune the mixture .
3helpful
2answers

I have briggs and stratton powered mower with the 18.5 v-twin ohv intek engine modle 407777 type 0121-E5 CODE 000512ZYG MY PROBLEM IS THAT MY CRANKCASE IS FULL OFA GAS OIL MIXTURE THE OIL FILTER ALSO...

When the float in the carb sticks, it allows fuel to drain into the cylinder, that runs pass the rings into the crankcase. When the crankcase is full the pistons cannot go down, and the starter won't turn the engine. Drain all the oil gas mixture, and refill with proper oil. Replace float, needle and seat in the carb bowl. Throughly clean fuel passages, and bowl. If motor won't turn, remove spark plug and turn over engine a few times to remove gas oil mixture from the cylinder too.
1helpful
1answer

Engine is surging when in idle

clean out the carburetor jets re-assemble then adjust fuel mixture screw until it runs correctly
0helpful
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How to you properly adj a 2-stroke carb on a motorcross bike to keep from fouling the plug

Heat the bike up, give it a ride for at least 15-20 minutes. in idle, try adjusting the little black knob attached to your carburetor. This will adjust your air/fuel mixture. Adjust it little bits at a time, and then wait for a second before adjusting further (to allow the mixture to change). Pay attention the idle, and how the bike sounds. Adjusting that carburetor should help.

for more info on 2t carbs

http://www.freeengineinfo.com/two-stroke-carb-tuning.htm

http://tech.flygsw.org/walbro_tuneup.htm

1helpful
1answer

Can a novice replace a carburetor on a Briggs & Stratton V-twin Intek 24 hp riding mower engine? If so, can I get some insruction sheets via email?

Yes its pretty easy you can do it.Are you sure the carb is bad most of them just need a good cleaning .I would disassemble be careful there are some little parts in there and if you are careful and pay attention as you disassemble it you can just clean it .Go to auto parts store get a can of spray carb cleaner .remove bowl be careful the is a float in there a little square or round bellows .Slide the pin out and then the fuel loat pin underneate the float now take out any adjustment screws you can find and spray cleaner in every hole you can find several times and reassemble if idle or fuel mixture screws were removed a standard setting of 1 1/2 turns out from seated position is the norm and some adjustment may be needed once running either in or out till runs smooth.

11helpful
2answers

Is the carb adjustment screw on bottom

Hello

>>The Following is an Instruction File I made for Correcting this Problem. Any Input is Appreciated.
>>****All the Carburetor Adjustments are the Same for Lawn Mower and Trimmers.
>>There are Several Location for the Air Mixture Screws.
>>The Idle Air Mixture Screws are Usually Located at the Top of the Carburetor Bowl and the Top of the Carburetor Body.
>>If the Main Air and Idle Air Mixture Screws are Side by Side on the Side of the Carburetor, then the Idle Air is the Nearest to the Engine.
>>The Main Jet Air Mixture Screw is Located in the Bottom of the Carburetor Bowl or Beside the Idle Air Screw on the Side of the Carburetor Body.
>>The Engine Idle Screw is Usually Easy to Identify because you can See where it Makes Contact with the Carburetor Throttle Shaft Plate Stop Ear. The H and L Air Mixture Screws Go Into the Body of the Carburetor and the Tips Cannot be Seen.
>>Some of the Older Model Carburetors have the Main Jet Mixture Screw Straight in from the Top of the Carburetor Body (this is Rare anymore).
>>If you have Cleaned the Carburetor (Disassembled and Soaked Overnight in Carburetor Cleaner (I Use Gunk). Then Blow Out the Passages with Compressed Air and Install a New Kit if Required.
>>Now Setting the Air Mixture Screws:
>>****Turn the Idle Air and Main Air Mixture Screws In Until SNUG **Do Not Jam** Then Reverse Both Screws 1 1/2 Turns.****
>>Holding the Throttle Full Open, Start the Engine.
>>Turn the Main Air Mixture Screw Clockwise Until Proper Revs are Obtained. Occasionally you May have to Turn this Counter Clockwise to Achieve the Proper Revs. Now Allow the Engine to Idle.
>>Set the Engine Idle Screw (Not Idle Air) so the Engine will Stay Running if Required.
>>Now Set the Idle Air Mixture Screw so there is No Hesitation when Throttling from Idle to Full Throttle.
>>Reset the Engine Idle if Required. If This Carburetor has a Single Air Adjustment.
>>Use the Section Above that Pertains to Full Throttle RPM Air Mixture Screw and then Adjust the Screw if Required to Eliminate Any Hesitation when Rapidly Throttling from Idle to Full Throttle.**
>>1- http://www.repairfaq.org/samnew/lmfaq/lmclctc.htm
>>2- http://www.cpdonline.com/692509.pdf .
Please, Do Not Hesitate, If you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance.
Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Be Happy. Thanks.

Good Luck

Respectfully

jbridger (John)
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