sent my fans back to jason for a refund because they quit working. i was refunded my money the day he received the fans. further, he indicated that i had improperly mounted the fans too close to the heads causing the wires to melt. just want to tell you if you order these fans and for any reason you don't like em you will get a refund.
Jason is a great guy, and he makes a quality product. But really... mounting them incorrectly is your fault, not his. They work great if they are installed properly.
Also, it's better to just leave them running all the time, because if they are not running, heat can be trapped between them and the heads. Or better yet - get his thermal switch and let it decide when to cycle them on and off. My fans will cycle on and off many times after shutting the bike off, as more heats migrates out to the fins where the switch is.
Ken