How do you adjust timing on a 1990 miata?

To adjust the timing on a 1990 Miata, first ensure the engine is at operating temperature and turn off the engine. Then, locate the timing mark on the crankshaft pulley and the timing indicator on the engine. Use a timing light connected to the number one cylinder's spark plug wire to check the timing. If adjustment is needed, loosen the distributor mounting bolts and rotate the distributor until the timing mark aligns with the specified degree (usually 10 degrees BTDC) on the timing indicator, then retighten the bolts and recheck the timing.