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Engine runs at too high a speed - Craftsman 17.5 hp 42 in. Deck Lawn Tractor - CA Model

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What is the factory setting for lowand high screws on 25cc craftsman blower


If the two screws are side by side, one is the high speed mixture screw and the other is the low speed mixture screw. To set the high and low adjustment screws, tighten the screws in until they stop, don't force the screw after it stops. Back each screw out 1 1/2 turns. The engine will start and run here if everything else is ok. Fine tune each adjustment screw by closing the screw off (CW) until the engine runs rough. Back the screw out (CCW) until the engine smooths out. Run the engine at full speed and adjust the high screw. Let off the trigger and adjust the low screw. Once the mixture screws are adjusted, you can turn the idle screw to adjust the idle speed. It can take some time getting it all adjusted.

Nov 20, 2013 | Garden

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Adjust idle


Hi Sean
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 aready tried to adjust them then the adjustments below should get it running for you for final adjustment when 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.
Bud

Oct 11, 2013 | Husqvarna Garden

1 Answer

How do I adjust the carburator?


There are two needle screws that can be adjusted to make the engine run properly. Be certain that the carburetor is clean and the diaphragm is in good condition, and the fuel is new. The two needle screws mentioned above should initially be adjusted at one turn open from turned in all the way (lightly seated). Each of these needle screws performs different functions. One is for idle and throttle response (this screw is marked "L" and the other screw is marked "H". L and H are marked on the carburetor body and also on the plastic "shroud" near the adjustment screws. These screws are not interchangeable, being foolproof since the thread sizes are not the same. When properly adjusted the low speed screw (L) allows the engine to idle properly and throttle response will work properly. When the high speed screw is adjusted properly the engine will have correct power at full speed. Adjust the low speed screw so that the engine idles and when you squeeze throttle all the way to wide open the engine should not hesitate and should come up to full speed and when you drop the throttle it should idle nicely without stalling. Now adjust the high speed screw. Hold throttle wide open, holding it there while you adjust the high speed screw. If this scares you (be carefully so that the spinning chain does not cut you!) you may adjust the high speed screw at idle, turning it just slightly in or out. The high speed screw should be adjusted so that the engine does not run clean at wide open throttle but sputters slightly, slightly adjusted open from running clean to slightly sputtering. When under load (cutting a log) the engine should run clean. Good luck!

May 21, 2012 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

What is the high / low carburetor adjustments and the fuel mixture for the UT21566 Homelite trimmer


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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Jul 09, 2011 | Homelite Mighty Lite Lawn Trimmer

1 Answer

Carburetor is running rich.


Hi jim paton...
You may have some trash/debris in your jets that is causing your engine to run rich, or maybe some did not adjust the high speed/idle adjustment screws properly

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.
Normally you will adjust your idle jet to 1/2 to 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 to 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.
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Jun 13, 2011 | Garden

1 Answer

Homelite st100 string trimmer carb ajustment with one ajustment highe and lowl


Hi lloydlavalla...

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.
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.
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Jun 07, 2011 | Homelite Garden

1 Answer

Radiator fan wont run at high speed


do you mean high engine speed or fan speed.
if fan speed is slow then motor in the fan is getting bad.
if your talking about running engine, then could be nothing because the sensor tell it not to..like running down the road it cools the car down and engine temp drops slightly enough to cut sensor off.

Apr 22, 2011 | 1999 Oldsmobile Intrigue

1 Answer

Mower running to rich,need to adjust down fuel mixture,when mower is running out of fuel it runs better


Is this on idle, fast speed or both? From what I read adjust the high speed screw clockwise in small increments and see if that is better, what this does is lean the mixture. You don't want too lean a mixture as this could eventually damage the engine, so adjust the needle back and fourth until you get the engine running good. Once it is running just right turn it back 1/8 to 1/4 turn to make sure it is not too lean. If the engine stumbles when going to high speed adjust the low speed needle until the motor goes to high speed without missing, or hesitating. Hope this helps.

Nov 22, 2010 | Briggs & Stratton Garden

1 Answer

Need intructions on carberator adjustments for mac-3514 35cc/cm3 runs but hard to start after using it for few minutes.


There is a low speed jet and high speed. Low speed sets the idle or stays running without feathering the throttle./// When setting high speed, hold the throttle wide open until engine revs high, then turn back in(at least ΒΌ turn) to slow the engine which in turn gives the engine more gas and runs cooler. If you have it too lean on the high speed, it will be hot and hard to start. Sometimes using 40 to 1 mix helps with starting, especially on older chainsaw. good luck

Sep 22, 2010 | McCulloch Garden

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