Sports Car (1600 Engine)

Care must be taken when adjusting throttle valves, make sure carburetors are synchronized.

1. Inspect damper oil in carburetors. Remove air cleaner and make sure pistons are free in their chambers. Connect tachometer and timing light. Start engine, bring to normal operating temperature.
2. Turn throttle adjusting screws to left until they no longer touch their stops. Screw in mixture adjusting nuts on both carburetors until they touch idle lock nuts, then turn mixture adjusting nuts back out 1/2 turn.
   NOTE: Do not adjust idle lock nuts.
   Fig 1: LOCATION OF ADJUSTING SCREWS

   Courtesy of NISSAN NORTH AMERICA, INC.
3. Adjust front throttle connecting rod length to 2.76". Turn in throttle adjusting screw (located on auxiliary shaft) to obtain an engine speed of 800-1000 RPM (1968-69 models) and 1000-1500 RPM (1970 models). Using a suitable carburetor synchronizer, adjust rear throttle connecting rod length until volume of both carburetors is equal.
4. Unscrew throttle adjusting screw (on auxiliary shaft) to lower engine speed to 700 RPM (1968-69 models) and 750 RPM (1970 models). Then screw in throttle adjusting screws on both carburetors until they contact their stops. Make sure carburetors are still synchronized then loosen throttle adjusting screw (on auxiliary shaft).
5. Set ignition timing at TDC. If engine speed changes, adjust by turning both throttle adjusting screws equal amounts. Timing should remain at TDC at 700 RPM (1968-69 models) and 750 RPM (1970 models). If using a CO meter proceed as follows:
6. Turn mixture adjusting nuts on both carburetors to obtain a CO reading of 2.0±0.2%. If engine speed changes, adjust by turning both throttle adjusting screws equal amounts to obtain 700 RPM (1968-69 models) and 750 RPM (1970 models).