Originally Posted by BigD64

The cut off works pretty good I have an 09 FLHTP with the 103ci motor which runs on the warm side. The engine will shut the rear cylinder down at idle the second you roll the throttle it will kick back to life. Makes a neat PUTT PUTT PUTT sound too. On the 09's the owner can turn it on or off. On the 07's and 08's I believe the dealer can activate or deactivate it. I leave mine, on a cooler engine means a longer lasting engine. I believe I read somewhere it kicks in at 220 degrees.