Question about McCulloch 16 Inch Gas Chain Saw MCC1635AK

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Carburetor adjustment idle speed adjustment

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Generally if you will set the screws about 1 1/2 turns an choke it on start it will go if everything else is ok. The set screws to proper idle an high speed run. Those are very cranky saws so take a few aspirins it might help. Lol

Posted on Mar 24, 2014

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Posted on Jan 02, 2017

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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 .

May 02, 2017 | Briggs & Stratton Briggs Stratton Intek V...

Tip

HOW TO ADJUST THE CARBURETOR ON A SMALL GASOLINE ENGINE


We all have some frustration with small gasoline engines from time to time. Often, do to our own weak maintenance schedule we put these engines away for the season without paying any attention to the recommended procedures in the owner manual. Today I am going to talk you through the steps to adjust a small gas engine's carburetor.
1. Read through the whole list before you start adjusting.
2. Close both jets GENTLY
3. Open the Low speed 1/4 turn
4. Open high speed jet 1 1/4 turn
5. Start engine.
6. Adjust low speed until idling smoothly.
7. Open her up wide open.
8. Adjust High speed until engine transitions smoothly from idle to high speed without bogging.
9. Shut engine off. Let it cool.
10. Once engine is cold. Fire it up and let it idle for 30 seconds. Open it up wide open again. Adjust if necessary.

Please Note - It is best to adjust the carburetor at the beginning of the usage season. In other words, don't adjust your rototiller engine in the dead of winter when you won't use it in those conditions. Regards, Joe

on Dec 31, 2009 | Sport & Outdoor - Others

1 Answer

Adjusting idle speed


idle speed is adjusted by the I underneath the LH screws

Jun 03, 2013 | Stihl Zama Fs-80 Carburetor C1q-s157...

1 Answer

The owners manual for my Ryobi 210 describes carburetor adjustment but the photos do not show which screw is the idle mixture adjuster.


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)

Sep 28, 2010 | Ryobi Garden

1 Answer

My 86 suzuki intruder 700 backfires out the exhaust at idle. and makes a tapping noise. i already did a valve adjustment an new plugs


It could be the speed of one carburetor is faster than the other. This causes the backfiring as well as forces one cylinder to run lean which causes the tapping noise. You will experience an identical tapping or "ping" when you get close to empty on main fuel and need to switch to reserve. Most likely you or the previous owner unknowingly adjusted the speed of the rear carburetor down because of the high stock idle not realizing the front carburetor needs to be slowed down to match. While running simply turn the idle adjust screw clockwise on the rear carburetor until the idle smooths out and the backfiring/tapping stops.

Sep 20, 2010 | 1995 Suzuki VS 800 Intruder

1 Answer

I have a McCulloch Trim Mac SL+ which will not idle. No matter how I try and adjust the idle screw it cuts out.


Which idle screw are you adjusting, the idle jet (L) or the idle speed screw which sets the throttle stop position. Adjust the idle speed screw while watching the throttle stop position so that it is pushed away somewhat. Adjust the L jet needle CW to stop (lightly), then back out 1-1/2 turns CCW. This should allow the engine to idle after warm up. Turn the needle CW while running for better idle, yet it should allow the engine to 'follow the throttle'. If this doesn't work as described, then check the fuel filter, air filter, and muffler for plugging. Check the fuel lines for decay or other damage. You may need to remove the carburetor and clean it inside and out with spray carburetor cleaner. For further insight, go to: http://www.drystacked.com for a 12 page article on Walbro brand carburetor theory and troubleshooting. This material applies in general to other brands of carburetor as well. Hope this helps!

Sep 13, 2010 | McCulloch Garden

1 Answer

Wondering if anyone knows where the adjuster for the carburetor is located on a 2001 1200 Sportster custom


Unless the carburetor has been modified, the only adjustment is the idle speed. The Idle Stop screw is located at the upper right side of the carb. You may have to remove the air cleaner cover to access the screw. Clockwise rotation increases the idle speed. Adjust the idle speed with the engine at full operating temperature.

Jul 15, 2010 | 2001 Harley Davidson XL 1200 C Sportster...

1 Answer

Chainsaw runs full speed, will not idle.


Expose the carburetor so that you can observe the action of the throttle lever on the carburetor. The trigger should move the lever from the idle adjust screw to full throttle stop. If no movement observed, remove the trigger assembly from the front handle (make notes as you remove the pieces) and clean the area of sawdust/dirt accumulation. Recheck the action after everything is re-assembled before starting the engine. If the idle speed is still excessive, then turn the idle speed screw several turns CCW until the chain stops turning. Try wiggling the carburetor body to see if it has come loose from the engine. Hope some of this helps!

May 13, 2010 | Garden

1 Answer

358-791010 2 cycle starts bur engine runs so fast...Is there an adjustment? Also, I have no owners manual, that would be very benificial.


There is an idle adjustment screw that adjusts the idle speed of the weed whacker on the carburetor.
Look for the throttle cable, and there should be a screw adjustment in the area where the throttle cable hooks to the carburetor. It will normally adjust with a screwdriver, turn the screw one way and see if it speeds up, if so then adjust the screw the other way to slow the idle speed down.
I hope this helps,
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May 02, 2010 | Craftsman 25cc Gas Line Trimmer

1 Answer

Need to know how many turns do i turn out the needle valves on the 11 hp briggs @ stratton. need to know for everyone. thanks


ADJUSTING THE IDLE SPEED AND MIXTURE
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 (image A). Finally, turn the screw back to the midpoint.
  5. Using a tachometer to gauge engine speed (image B), 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 (image D), 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 (image C).

Sep 18, 2009 | Garden

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