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Deceleration Valve

NOTE: Air cleaner must be installed.
  1. With engine idling at normal operating temperature, disconnect hose between carburetor and deceleration valve and check for vacuum passing through valve. If vacuum is present, adjusting screw on deceleration valve has to be screwed in further until valve is closed. Reconnect hose between carburetor and deceleration valve.
  2. Connect a tachometer and adjust idling speed to 900 RPM. Open throttle to obtain 3000 RPM. Release throttle and measure time required for engine speed to drop from 3000 RPM to idle. If deceleration valve is correctly adjusted, time should be between 7-8 seconds. If not between 7-8 seconds, valve must be adjusted.
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