Service Procedures
NOTE:
On 1600 cc engines, it is necessary to first determine carburetor model used. Number is stamped on fuel bowl opposite accelerator pump. A 28 mm venturi is used on early models and is numbered 701W-9510-EA. A 25 mm venturi is used on later models and is numbered 701W-9510-EB.
Connect a tachometer and install a vacuum gauge between carburetor and decel valve. Length of tube connecting vacuum gauge should not exceed 60". With engine at normal operating temperature, ignition timing and idle RPM set to specifications, proceed as follows:
- Bring engine to 3000 RPM and maintain for about 2 seconds. Release throttle and note time interval between throttle release and a zero reading on the vacuum gauge. Time interval should be as follows:
Engine Seconds 1600 cc (Carb. 701W-EA) 3.5 1600 cc (Carb. 701W-EB) 2.5-3.5 2000 cc (Manual Trans.) 2.5-3.5 2000 cc (Auto. Trans.) 1.5-3.5 2600 cc (All) 1.5-3.5 - If adjustment required, remove and discard colored cap (if equipped) for access to nylon adjuster. Using a suitable tool, back adjuster outward to increase time or turn adjuster inward to increase time. One turn of adjuster, in either direction, will increase or decrease time approximately 1/2 second.
- When nylon adjuster is flush with top of threaded collar, the maximum permissible adjustment is 1 full turn inward or 9 turns outward. When adjustments are completed, snap in new service replacement colored cap in top of valve.