Garden

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Most chain saws have a simple adjusting screw that is tapered on the end to a point. The throttle plate actuator arm rests against the taper. A clockwise rotation of the adjustment causes the arm to slide slightly further up the inclined point, opening the throttle plate a tiny bit which results in a slightly higher idle.

Idle speed is entirely different than the low speed adjustment.

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Turn the idle screw to adjust the idle—turn the screw to the left to increase the RPM or to the right to lower it. When you have adjusted the idle—aim for 650 RPM—reconnect the idle air adjustment valve`s electrical connection. Lower the hood and turn your car off.
If the motorcycle has a carburettor, the idle speed can be adjusted using the idle screw. If the motorcycle comes with fuel-injection technology, the rider can adjust the idle speed with the small knob that sticks out of the engine compartment on the left or right side of the bike.
Usually we see the idle speed being between 1000 and 1300 RPM (engine revolutions per minute) when the engine is at operating temperature, and often as bit higher during warm up.
High idle speeds waste fuel, cause extra wear and tear on your engine, and can be unsafe as well. If your foot should slip off the brake as the engine revs, it could cause your vehicle to lurch forward, putting other drivers and even pedestrians at risk.
Every dirt bike is a little different, but the idle should be set so that the engine can stay running without the RPM being too high. This is generally going to be 1000-1500 RPM. Since most dirt bikes don`t have a tachometer to visually see the engine RPM, you just have to go be sound and feel.
The idle speed should feel consistent without skipping or slipping. In most of today`s cars, an idle speed of 600 to 1000 RPMs is average. If your car is idling rough, though, it won`t feel smooth. The RPMs will jump up and down, for example, or they`ll fall below 600 RPM (or whatever is typical for your vehicle).
The Idle air control valve or the IAC valve controls your engine`s idle speed and is controlled by the engine`s onboard engine computer system. The IAC valve controls the amount of air circulating around the closed throttle plate.

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HOW DO YOU ADJUST HIGH AND LOW SPEEDS ON HOMELITE BLOWER UTO8087 IF ONLY 1 SCREW ADJUSTMENT. 1 PORT FAC. PLUGED OFF.WHAT SHOULD IDLE RPM LOW B APPROX./ HIGH RPM
ANSWER : All the pictures I have of this carb show two adjusting screws.

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Idle goes up and down and the shuts off eventually
ANSWER : It sounds like the engine might be running too lean. You need to get someone to adjust the idle and high speed screws correctly.

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Trimmer takes a long time to warm up. Cuts out when under full trottle and will not idle. Which screws are high and low speed adjust? There are two of them side by side. Do U need a special tool to adjust hi/lo speed screws?
ANSWER : Sounds like the carb needs cleaning, it is staying on choke to long. I would not bother the screws, or either a hose for the gas flow is bad.

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The tines on a honda f220 always spin and don’t change speed when clutch is engaged but speed up when throttle is increased. Adjusted cable with no luck.
ANSWER : I believe that unit utilizes a centrifical clutch. try decreasing the idle speed and see if the tines stop. They should then engage as throttle is increased.

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The engine idles way too fast and will not correct with the sow speed adjustment
ANSWER : Make sure that you are adjusting the idle speed screw, not the idle jet screw (L). If you are adjusting the proper screw, then it is possible that the throttle trigger assembly in the handle has a load of sawdust/dirt that blocks proper return to idle. Take the handle apart carefully, and make notes on how the parts go back together. Check at the carburetor throttle assembly to make sure the throttle arm returns fully to the idle speed screw when the trigger is pulled and released slowly. Check the throttle spring as well to make sure it is undamaged. Hope this helps!

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Member Discussion on Husqvarna 240e Chainsaw Idle Adjustment I have a new 240e and cannot keep it running. It will start, after many pulls, and one of two things happens. After running for 30 seconds, I will tap the trigger to set the idle and it will promptly idle down and die. Or, I do nothing, and it will idle for a bit and die. Restarts are difficult. I did not get a manual with the saw, so all I have to work with is one I downloaded. Idle adjustment is mentioned, but no indication where this adjustment might be. Thanks
ANSWER : Its not an idle screw adjustment issue, it is a mixture screw adjustment issue, unfortunatly there is a special tool to adjust the mixture screws, pt no. 530035560 ( available from Hysqvarna dealers ) once you have this tool you can make an adjustment to the L screw on the carb, undo ( anti clock wise ) this screw ten minutes on a clock face ,this will richen the muxture, and should make it more stable on idle.

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What is correct adjustment for high and low scews
ANSWER : With the saw warmed up adjust the low for best idle.Adjust the high for best speed then adjust a little richer from that point.Caution……Running at best speed (power) settings which is “lean” will 90% of the time burn the piston……thats why you go a little richer on that setting.

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Where is the idle adjustment screw on my 42/18
ANSWER : On the left side of saw above primer button is a hole going to the carb, the screw is there below switches.

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