How Do You Sync Carbs?

Carburetor synchronizations occurs when carburetors work in concert with engines. Carburetor synchronization is essential so that different cylinders operate at the same rpm, keeping the crank turning smoothly so that the engine idles well and runs with power. If the carbs fail to sync, your engine may vibrate, which can cause minor or severe problems to the vehicle.

Instructions

1

Choose a location with plenty of ventilation, as the process requires the engine to run for a period of time. Ideally, synchronize carbs outside or in a garage with the door open. Place a cooling fan in front of the engine to prevent against overheating.

2

Read the service manual to learn the basic procedure for synchronization for your particular make and model motorcycle. Use the manual to identify where the adjusters and vacuum ports are located.

3

Disassemble the motorcycle using the screwdriver tip and socket, according to manual instructions, to see the carburetors. Generally, remove the seat, the fuel tank and body work, depending on your particular bike. Attach an auxiliary fuel tank, if you have to remove the bike's tank to access the carburetors, to test the engine after adjusting the carburetor settings. Place the fuel tank in a location away from the exhaust pipes, such as on a stool or table.

4

Connect the gauges to the cylinders with adapter tubes. Gauges and cylinders are each marked so that you can identify which gauge matches with which cylinder.

5

Start the engine and set the idle to manufacturer's recommendations. Observe the gauge. Spin adjustment screws until carburetor readings synchronize with the gauge readings. Normally, spin screws clockwise in small increments (one eighth turn at a time) to adjust gauge readings until they are identical with carbs. Gently raise the engine speed to a fast idle to verify work, and fine tune as necessary.

6

Disconnect the gauges and reassemble the bike. Replace the original fuel tank, seal all vacuum caps and clips tightly and put lines in the right place, according to manual instructions.