How to you adjust the idle speed?
How to adjust the idle speed
If you have a carburetor, there is a crew on the driver side behind the throttle cable it usually has a spring on it if you turn it to the right it idles up left it idles down
If its a fuel injected motor idle is handled by the computer. There usually is a "base idle speed" around 800-1000 RPM. This normally doesn't need to be adjusted.
Have a look for carbon build up on the butterfly as well, this will influence idle too.
u can also adjust the cable there's two nuts that hold the the cable to the injection adjust one way to lower and the other way to raise
Also: check & tighten all hoses as even slightly leaking hoses raise & lower ur idle speed.
What is the black knob under the left carb on a 2005 Triumph Bonneville Motorcycle do. How does it work and how do you adjust it?
That is the idle adjustment. Turn it clockwise to increase the idle speed, counter-clockwise to lower the idle speed. You should not adjust the idle until your engine is fully warmed up, about 5 minutes of running. Adjust the idle speed to just over 1,000 RPM with the clutch in and the transmission in 1st gear. This is the most load your Bonneville will have at idle speed. You may need a bit of assistance…