Content

• To step
• Warnings
• Necessities

Correct idle speed is important with the 34PICT / 3 carburettor, which is more complicated than previous models as it has three separate fuel circuits.

To step

1. Make sure the engine is warm and the choke butterfly is upright. Make sure the air cleaner is ON when adjusting the carburetor.
2. Locate the throttle on the left side of the carburetor. This is controlled by the throttle cable that runs to the accelerator pedal in the cabin.
   • On the top of the throttle, facing the rear of the car, is a quick idle adjustment screw.
     • This works with the choke to provide a smooth idle speed on a cold engine.
     • As the choke warms up along with the warm-up engine, the butterfly valve in the carburetor neck opens and the fast idle adjustment screw moves down through the stepped disc, reducing the engine's idle speed.
   • Make sure that the choke is fully open and that the fast idle adjustment screw rests at the very bottom of the stepper disc.
     • Unscrew the fast idle adjustment screw until it disengages from the stepper disc.
     • Screw it in until it just touches the bottom of the stepper disc - NOT on one of the steps itself.
     • Now screw it in another quarter turn. This sets the throttle butterfly to the required 0.1mm.
3. Locate the volume adjustment screw and bypass screw on the left side of the carburetor. Loosen the bypass screw (the bigger one) a few turns to start everything up.
   • The volume adjustment screw is the smaller of the two adjustment screws.
     • Carefully screw it in until it reaches the bottom.
     • Now loosen it exactly 2-1 / 2 turns. This is the start setting.
     • Start the engine and use the bypass screw to set the idle speed to 850 rpm.
4. Slowly adjust the volume screw again (usually outward - counterclockwise) to achieve the fastest idle time.
   • It shouldn't be much out of the 2-3 turns 1/2 turn in / out range of the basic 2-1 / 2 basic settings.
   • Reinsert the screw very slowly until the speed drops at approximately 25-30 rpm.
5. Use the bypass screw again to reset the idle speed to 850-900 rpm.
   • If you find it difficult or impossible to achieve this setting, it is possible that the threads of one of these adjusting screws are damaged, the conical screw cavity is damaged, the needle valve is damaged, or the O-ring has been removed.
   • If you find it difficult or impossible to achieve this setting, it is also possible that you have a vacuum leak (i.e. air leak in the exhaust manifold).

Warnings

• Common sense is VERY IMPORTANT.
• Always use the right tools for the job.
• THERE IS NOTHING AS IMPORTANT in this world as ALWAYS safely maintain your vehicles.
• Safety should always be the most important thing when working on a vehicle.

Necessities

• Tachometer
• Screwdrivers