If it has a carburetor, then there should be a screw somewhere on the carburetor. If it's fuel injected, then I don't think you can adjust the idle without hacking into the computer.
To set the idle, adjust the carburetor.
With the engine running, turn the idle screw until you get the speed you want.
My engine is idling too high. How do I adjust the idle speed?
The carburetor on a Weed Eater Featherlite SST25 is adjusted by turning the screws on the side of the carburetor. They control the idle mixture and idle speed of the engine.
Find the carburetor and then adjust the idle screw however you like. You'll need a Philips screwdriver.
there is a little screw on the back of the carb. if you loosen it, it will idle slower, tighten it, it will idle faster.
1973 vw beetle
If it is a fuel injected engine then you can not adjust the idle, it is computer controled. There is no idle adjustment. If it is a carburetor then there is a small screew over by the throttle cable, down towards the bottom of the carburetor.
Start at 1 1/2 turns from seat and adjust for best idle at that point
Start at 1 1/2 turns from seat and then adjust for best idle
Actually, it should be don e with a vacuum gauge, to maximum vaccuum. Without one, adjust the idle mixture to max., idle.