When it is hot outside. I sometimes have trouble restarting my 92 Civic EX and suspect another bad ignition module. But the distributor was replaced a few years ago because it was doing the same thing then. As I understand the module is built into the distributor and cannot be replaced without changing the distributor.

But I have also noticed that since the distributor and timing belt were replaced the engine has been running a little bit warmer than before the work was done. Could this be due to bad timing?

If it starts fine in the cool of the morning, but not in the afternoon, the main relay may be bad (cold solder joints). If the problem persists and you decide to replace the Ignition Control Module, here's how to do it:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-4.html#post265896

Keep a close eye on the heating situation--you don't want to warp the aluminum head and damage the valves. You may want to change the coolant, replacing it with a 50/50 mixture of antifreeze and distilled water. Be sure to open the bleeder valve, while refilling, in order to eliminate air which can cause overheating.

If the timing is too far retarded, it could contribute to overheating. Here's how you can easily check the timing:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563.html#post219963