DR-21B Checking Spark Advance

This test must be performed with engine warm.

1. With tachometer and timing light connected, air cleaner removed and engine fully warm, turn engine off and restart. Power loss lamp on instrument panel must go off.
2. Raise engine speed to 2,000 rpm's.
3. If timing is 31°---39°, proceed to Test 22. DR-22A Fuel Supply & Return System
4. If timing is not 31°---39°, replace logic module.