With new ECU, just let it warm up for 5 minutes before each ride and you'll never have a problem again. If you want to ride again after 3-4 hours parked, 2 minutes warm-up would be enough.
This is from my own experience and doing that I have no problems at all.
To be more acurate, if you're in hurry, wait for one bar on temperature display and then you can ride but two bars would be the best.