circuit to shorten ignition signal?

My remote starter is time based, and the ignition signal is too long for my starter motor. When I use remote start, I can hear that the starter motor still continue to run for 1 sec after engine is cranked. I am not sure if it is healthy for the starter motor in a long run. Since the "cranking" time cannot be adjusted nor there is any tacho detection signal, I will need to add a circuit to shorten the ignition signal. What is the easiest way to shorten the ignition signal? thanks in advance!

Technically you need to shorten starter crank time and as far as I know all R/S units have this facility OR an anti-grind facility. the above will also work just as well on your starter output lead from the remote.

thanks for the quick reply, i have checked the remote starter unit and there is no way to adjust the crank time. I know there are higher end model that can detect the rpm and cut off the cranking as soon as the engine start. too bad mine doesnt have this feature too.

nothing to do with the car, it is a china-made 2-way alarm with remote start function. However, the remote start function is a bit crippled as the crank time cannot be adjust. Neither there is any sensor to detect the RPM of the engine.