Honda 1999 Shadow Aero VT1100C3 Owner's Manual page 115

Engine Idle Speed
2. Place your motorcycle on its side stand
on a firm, level surface.
3. Connect a tachometer to the engine.
4. Shift into neutral. Start the engine.
S. Adjust idle speed with the throttle stop
screw ( I).
Idle speed (in neutral):
1,000
±
100 rpm