How do you do the timing on a 1990 miata?

To set the timing on a 1990 Mazda Miata, first ensure the engine is at operating temperature, then turn off the engine and remove the timing belt cover. Use a timing light to check the timing marks on the crankshaft pulley and the timing indicator on the engine. Adjust the timing by loosening the distributor hold-down bolt and rotating the distributor until the timing light shows the correct timing value (usually around 10 degrees BTDC). Finally, retighten the distributor bolt and recheck the timing to ensure it remains correct.