after reading miata forums i found the most pronnounced cases manifest themselves when straining the clutch a lot.

Here is Mazda's Service Bulletin information. All service bulletins can be found here

CLUTCH CHATTER DURING COLD TAKEOFF
Applicable Models
Model Starting S/N Ending S/N
1999 PROTEGE 00000000 ZZZZZZZZ
2000 PROTEGE 00000000 ZZZZZZZZ
1999 PROTEGE 00000000 ZZZZZZZZ
2000 PROTEGE 00000000 ZZZZZZZZ
2001 PROTEGE 00000000 ZZZZZZZZ
2002 PROTEGE 00000000 ZZZZZZZZ
2001 PROTEGE 00000000 ZZZZZZZZ
2002 PROTEGE 00000000 ZZZZZZZZ
2002 PROTEGE 00000000 ZZZZZZZZ
2002 PROTEGE 00000000 ZZZZZZZZ
2002 PROTEGE 00000000 ZZZZZZZZ

Some vehicles may exhibit a clutch chatter or judder when releasing clutch during cold conditions. This may be caused by the flwheel and clutch cover surface materials creating a chatter or judder during clutch engagement. The flywheel and clutch cover has been revised to correct this concern. 1. Verify customer concern. 2. Remove the manual transmission according to the following Workshop Manual procedure: * 5 Speed: MANUAL TRANSMISSION REMOVAL/INSTALLATION M25M-R (section 05-15A-3). 3. Remove clutch disc, clutch cover and flywheel according to the Workshop Manual procedure CLUTCH UNIT REMOVAL/INSTALLATION (section 05-10). 4. Install new clutch disc, clutch cover and flywheel according to the Workshop Manual procedure CLUTCH UNIT REMOVAL/INSTALLATION (section 05-10). 5. Reinstall the manual transmission according to the following Workshop Manual procedure: * 5 Speed: MANUAL TRANSMISSION REMOVAL/INSTALLATION M25M-R (section 05-15A-3). 6. Verify repair. Part(s)Information: Part Number Description Qty Notes FP01-16-410A-9U Clutch Cover 1 1.8L FS05-16-410A Clutch Cover 1 2.0L FP49-11-500A Flywheel 1 1.8L FS01-11-500A Flywheel 1 2.0L B633-16-460A-9U Clutch Disc 1 1.8L FS06-16-460 Clutch Disc 1 2.0L Note: Make sure the dealer contacts DAG to specify order the above parts.