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.
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.
how do i adjust the ignition timing on a 1990 suzuki gsx 750f
It doesn't have timing..
Here you can find the whole instructions how to change your timing belt on a Miata http://www.racecaddy.com/mx5/tech/timing-belt-mx5.html it has good images and it is well explained good luck
You can't...it's electronic.
how do adjust timing belt on a volvo 240 DL ?
The Mazda Miata, specifically the first-generation (NA) models produced from 1990 to 1997, did not use a timing belt; instead, they were equipped with a timing chain. The second-generation (NB) Miatas from 1999 to 2005 continued to use a timing belt in the 1.8L engine. However, the later third-generation (NC) models from 2006 to 2015 reverted back to a timing chain. Therefore, the Miata models with a timing belt were only the NB variants.
Timing Belt
To advance the timing on a 2003 Mazda Miata, you'll need to adjust the ignition timing using a timing light. First, locate the timing mark on the crankshaft pulley and the timing indicator on the engine block. Connect the timing light to the battery and the number one spark plug wire, then start the engine and observe the timing mark while revving the engine slightly. If necessary, adjust the distributor by loosening the hold-down bolt and rotating it to advance the timing, then retighten the bolt and recheck the timing. Always ensure that the engine is at the correct operating temperature before making adjustments.
On a 1991 Miata, the battery is in the trunk. It is probably the same on the 1990.
Adjust your timing
The 2013 Mazda Miata is equipped with a timing chain, not a timing belt. Timing chains are generally more durable and require less frequent replacement compared to timing belts. This means that the timing chain in the Miata is designed to last the life of the engine under normal driving conditions.