Welcome to the on-line reference manual for the 1991 (89-91 in most cases) Honda CRX.  You should find this an excellent method of finding information in your current manual as there is no index in the factory manual.  

Common Pages:

19-12    Brake Bleeding
12-3    Clutch (Exploded View and torque values)
23-58    Ignition Timing Inspection and Setting (setting the timing)
11-19    Electrical Connections - STD/DX  (with ECU pin out)
11-20    Electrical Connections - Si/HF (with ECU pin out) 
11-26    ECU "Codes"
11-90    Idle Control Setting (STD/DX)
11-91    Idle Control Setting (Si/HF)