I replaced my Opti-Spark today. It wasn't all that hard. I filled it with 50/50 mix and now, it's overheating like crazy. I opened the top bleeder screw. It bled are forever then stopped. I drove it down the street. Overheated again, I opened the bleeder screw, bled for about 10 minutes. I've went through this process for about an hour! Any other places I'm not looking? How long does it usually take to bleed the system of air?

 

There should be two bleeders. Just keep on bleeding till it does not overheat.