how do you retard or reset the timing on the 240sx OHC?

[exodus5547097]

how do you retard or reset the timing on the 240sx OHC?

[rogoman]

Here's a procedure for setting up the distributor timing:Fully warm up the engine. Shut engine off. Disconnect the TPS harness connector; it's located on the passenger's side of the engine just above the throttle assembly. Attach timing light to #1 plug wire. Start engine; the OEM timing should be 20 degrees BTDC on a DOHC and 15 on a SOHC. Loosen bolts and turn the distributor slowly while watching the timing marks on the pulley with the timing light. Stop the engine. Reconnect the TPS harness connector.

[AZhitman]

Also, there's an article on this at http://www.240sxTech.com.