They haven't worked for a while...

At what mileage should a timing belt be replaced?

Fuel octane?

Timing belt replacement schedule.

Recently replaced the battery and now the radio doesn't work because I do not know the code for the security system. Need the serial number off the radio and a dealer can then provide the code.

I need a timing belt replacement on my Honda S2000. Where is the closest reliable source of S2000 maintenance/ service to Reno, Nevada?

The car is overheating but I have no heat in the car. The no heat would cause me to think its the thermostat, but it doesn't explain why It's over heating?