Troubleshooting Automatic Choke

TROUBLESHOOTING AUTOMATIC CHOKE

Problem:
Speed remains too high at high engine temperatures or no speed increase on cold engine.

Possible Cause:
Auxiliary air regulator or auxiliary air valve defective.

Remedy:
1. Disconnect top control line at auxiliary air valve and plug.

Problem corrected: Replace auxiliary air valve.

Problem unchanged: Auxiliary air valve good.

2. Cold engine:
If there is no increase in speed, auxiliary air regulator is defective.

Warm engine:
Disconnect one hose at auxiliary air regulator and plug both openings.

Speed too high: auxiliary air valve defective

Speed drops: auxiliary air regulator defective