Turn idle adjustment screws each bore on carb until you reach desired rpm on tach. (recommended idle speed.)
Idle is automatically set by the computer with the use of an idle motor.
You will need to hook up your tachometer to the coil connector. After disconnecting the throttle sensor and applying the hand brake, look for the plain black wire at the coil connector to hook it up to.
This is hard to explan but I'll try. The engine should be at normal temperture. (1) Use an optical tachometer such as Snap on # MT139 or Cummins # 3377462 to read the engine rpm (2) Adjust to low idle speed at the low idle speed screw. The srew & locknut are located at the rear of the fuel injection pump. (Looking at the pump with someone you trust slowly pushing the gas pedal. The lever at the rear of the pump will rest on a set screw when the pedal is at idle position. This is the low idle set screw). Loosen the lock nut at the bottom of the screw and adjust to factory spec. From the factory manual with an automatic 750 to 800 RPM with the park brake lock, transmission in drive & air conditioning on. (Real partner TRUST is needed here). With manual trans. 780 RPM park brake set, in neutral & air condition on. You can also just use the tachometer on the dash. Note: you need a 10mm deep socket or wrench to adjust.
there is a screw on the carb right where the throttle cable hooks to it that you use to adjust the idle.
Idle is set by the computer.
The inventor is unknown for a tachometer. However, the first documented use of a tachometer device was by the German engineer Dietrich Uhlhorn in 1817. He is credited with its first use, but not necessary as being its inventor.
Use the idle speed adjustment screw to set the idle speed as low as possible without stalling. http://store.chainsawr.com/
There is an idle screw on the side of the carb its the one you can turn by hand if you have to use a screw driver its probably not the idle screw. turn it CW to increase and ccw to decrease.
Use the idle speed adjustment screw to set the idle speed as low as possible without stalling. http://store.chainsawr.com/
The idle speed is set at the factory and is NOT adjustable.
To set the idle, adjust the carburetor.
A tachometer will help your engine by helping you make more efficient use of it.