How do you adjust the idle speed on a 98 Yamaha warrior?
If your looking at the carbueretor from the left side of the warrior, there is a small idle screw on the bottom-left side of the carbueretor. Turn it clockwise looking up at the screw to turn the idle up, and vice versa.
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…