Carburetor Synchronization: Prelude
- Disconnect Red-braided purge hose from purge canister. Connect vacuum gauge to hose. Connect tachometer to engine. Start and warm engine to normal operating temperature (cooling fan comes on).
- Increase engine speed to 3000 RPM by turning throttle stop screw. See Fig 1
. Note vacuum gauge reading. While engine speed is at 3000 RPM, pinch Red vacuum hose under choke housing and note vacuum gauge reading.
- If vacuum gauge reading did not change, the carburetors are properly synchronized. If readings were different, adjust the synchronization screw until vacuum gauge reading does not change. See Fig 1
.
- Remove tachometer and vacuum gauge. Reconnect purge hose to canister. Readjust idle speed. See IDLE SPEED
in this article.
Courtesy of AMERICAN HONDA MOTOR CO., INC.