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Mixture screw adjustment al ko kb 4001

Starts but wont rev sounds like its choking

Posted by Anonymous on


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: ryobi 31cc lawn trimmer carb adjustment

As with all 2 strokes if you have compression and a reasonable spark, you only need fresh fuel with correct oil ratio) and they must go !(as long as you haven't fiddled first and all gaskets are sealing) I start mine by(1) pumping the primer till it is firm,(2) full choke,(3) pull till it kicks ONCE,(4) half choke, pull till it runs,allow to warm up and(5) switch to run (you may need to apply a bit of throttle while pulling as in (4)(or give it a few more pumps if it dies) If all is ok, check that when properly warmed up there is a smooth transition from idle to full revs, if it hesitates it may need the LOW SPEED mixture leaning (clockwise) SLIGHTLY.If it dies the LOW SPEED mixture may need richening(anti-clockwise)(adjust 1/8 turn at a time) Make sure that motor is just peaking at full revs and is on the RICH side of peaking (HIGH SPEED mixture)(this will avoid seizing it Adjust both till it revs cleanly and is JUST rich at full, and idleing nicely and it should start without too much trouble.(If you have fiddled and are lost,-about 2 1/2 turns out from closed on both needles should get you started)

Posted on Nov 24, 2008

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SOURCE: Chain saw will not start


Posted on Jun 20, 2009

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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.

Posted on Jul 04, 2009

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SOURCE: Toro String trimmer will not start; good spark; getting gas

Hi this would be the only possible solution , The flywheel may have come loose causing the keyway to sheer off this is a common problem the only way to tell is to remove the flywheel and have a look.

Posted on Aug 04, 2009

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SOURCE: I am looking for a tool to adjust the air mixture

yes the EPA has mandated you be trained how to properly adjust the new carbs, Any qualified Husqvarna dealere would be happy to sell you the tool and show you how.

Posted on Oct 28, 2009

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Why does my poulan 2075 runs with choke on but not when i push the choke in?

Crank seals could be leaking air in,or carb settings incorrect.screw both mixture screws right in,then out 1.5 turns..set low mixture screw for highest idle,you may need to unscrew the idle screw a bit to keep revs down.adjust H mixture screw at full revs,to get max revs,then unscrew 1/4 turn.may need to reset idle

Jul 23, 2014 | Poulan Garden

1 Answer

When choke is off wont idle

Hi, Anonymous and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
11. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on the links below. Good luck and have a nice day.
YZ426 won idle without choke Intake Jetting Fuel Injection
YZ426F Won Run Choke 4Strokes com
Yamaha YZ426F Owner Service Manual
OEM parts for Yamaha
Yamaha YZ450F Owner Manual Page 3

Jan 15, 2013 | 2001 Yamaha YZ 426 F

1 Answer

Vuka XL 110 What is correct setting for air mixture screw on carburetor?

wined the air mixture screw all the way in and then 2 and a half turns out then start the bike if it will let you (no choke) if it wont start turn another .5 turn until it will start.
Once you get it started leave it running at idle and listen to the engine noise very carefully. give it a rev and even a ride if it stalls wined it out .25 of a turn.

Jun 11, 2012 | Vuka XL 125 Motorcycles

1 Answer

Gq carby revs high wont wined down under 1500rpm

Idle speed is not controlled by the mixture screws, those will need to be reset to original position so you can start it easier.

If you look at the throttle shaft, with engine off, move the throttle so you can locate both sides of the throttle, or at least one side and infer the location of the other end of the shaft. There should be a pair of screws that rest against a cam on that shaft, or the screws will be on a lever attached to the shaft. One adjusts cold idle, it will be the one resting on a stepped cam. The choke needs to open fully to move that cam/lever out of the way so the second screw can sit against the carburetor casting- which will be your low idle adjustment.

The choke thermostat coil likely needs replacement. or a metal link rod fell out.

May 03, 2012 | Cars & Trucks

1 Answer

My husqvarna 122c starts fine with the choke on. When the choke is turned off, the motor revs very high then eventually dies. If I feather the press the throttle, it dies right away? carb issues?

This is classic fuel starvation, replace the fuel filter in the tank, check the fuel hoses from the tank to the carb for signs of leaking or slits and cracks, failing that you may need to adjust the fuel mixture, there is a special tool to adjust the mixture screws, part no. 530035560 ( try the web for sellers ) once you have the tool unscrew the H screw 1/4 turn to adjust the upper fuel supply.

Oct 24, 2011 | Garden

1 Answer

My poulan starts easy and idles with the choke pull out but will not stalls out when gas is rev..It runs only seconds when choke is pushed in

It is sounds like it is running too lean ( fuel starvation ) before doing anything else replace the fuel filter in the fuel tank, check the fuel hoses up to the carb for leaks or signs of cracks, many later machines have anti tamper screws on the carb, it maybe that the mixture needs to be richened up a little, if you just have standard slots in the adjuster screws, make an adjustment to the H and the L screw, turn them out 1/4 turn on each, check the running now, the L screw will adjust the fuel mixture from idle up to half throttle, the H screw will adjust the mixture from half throttle to full revs, if it hesitates on pick up adjust the L screw a further 1/4 turn. If it sounds rich at full revs wind the H screw in slightly, be aware the H screw can lean the mixture off enough to seize the machine if screwed in too far, if you have a tacometer the max revs should not exceed 12500.

Sep 10, 2011 | Poulan 14" Chainsaw

1 Answer

Engine dies upon acceleration after starting and idling

turn the high speed and low speed mixture screws right in[gently]then out 2.5 turns.start it up,screw the idle screw up till it will idle,then adjust low speed mixture screw in or out so you get the highest idle.keep lowering the idle so as you adjust the screw,it wont get it any higher in by now it should,open the throttle wide,and adjust the high speed screw until you get maximum revs..then,turn screw 1/4 turn out.that makes it slightly richer,cooling the plug with droplets of dont want it lean.if it wont rev fully,check the fuel filter.they get dirty quite often

Jul 02, 2010 | Echo 30.1CC Chainsaw With a 14 and...

4 Answers

Carb adjustment


>>The Following is the Instruction File for Setting the Air Mixture Screws. Any Input is Appreciated. The Procedure is the Same for 1 or 2 Mixture Screws, Just Use the Instruction File and Skip Over the Section with the Missing Mixture Screw ( Usually the H Mixture Screw).
>>Now Setting the Air Mixture Screws:
>>****Turn the Idle Air (L) and Main Air (H) Mixture Screws In Until SNUG **Do Not Jam** Then Reverse Both Screws 1 1/2 Turns. Set the Throttle Full Open, Start the Engine.
>>Turn the Main Air (H) Mixture Screw Clockwise Until Proper Revs are Obtained. **Carefully Use your Finger and Move the Governor Arm to Rev the Engine (on Chainsaws and Trimmers Use the Trigger to Rev the Engine) Until you Reach Max RPMs (on Chainsaws and Trimmers, the RPMs are Not Set to MAX. Set to Max and then Reverse the Setting Screw 1/4 or 1/2 Turn. If the H Mixture Screw is Set too High; the Engine will be Starved for the Oil in the Gas and Damage the Piston and Jug/Cylinder) and the Engine is Running Proper at Full Throttle Up a Grade. 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 (L) Mixture Screw so there is No Hesitation when Rapidly Throttling from Idle to Full Throttle. Reset the Engine Idle if Required.****
>>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 Happy.



Apr 21, 2009 | Ryobi 30 Cubic Centimeter Curved Shaft Gas...

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