How do you adjust the air screws on a carburetor?

Set the idle screw so that the engine is idling at a normal RPM. Take a small screwdriver and start turning one bleeder screw on one side of the carb inward until the idle either drops or rises. If it drops, you are going the wrong way, so turn it the other way until the you hear the engine’s idle rise back up again.

What is the PMS screw?

PMS (Pilot Mixture Screw): Turning In (clockwise) = Leaner – you are turning the taper of the screw into the opening and allowing less fuel to pass. Turning Out (counter-clockwise) = Richer – you are turning the taper of the screw away from the opening and allowing more fuel to pass.

How do you adjust a carb screw?

Turn the high speed or main jet screw clockwise until the engine begins to slow. Then, turn the screw the other way until the engine begins to slow. Turn the screw back to the midpoint. Once adjusted, check engine acceleration by moving the throttle from idle to fast.

What does it mean to sync an outboard motor carburetor?

When you sync an outboard motor’s carb, you adjust its linkage so that it performs in concert with the other carburetors on the motor. The carburetors on any engine with multiple carburetors must be synchronized so they operate as a single carburetor.

How do carburetors work on an outboard motor?

Once the carburetors are synchronized, all of the outboard’s carburetors will deliver a similar flow of fuel and air mixture to all cylinders, simultaneously. This balanced flow of fuel will help to ensure that your outboard motor operates at optimum levels.

How do you remove a follower roller from a carburetor?

Locate the throttle cam follower roller, near the end of the throttle shaft and connected to the carburetor-end of the throttle cable of both carburetors. Loosen the roller adjustment screw with a screwdriver and separate the throttle cam from the follower roller on each carburetor.