I'll ask a dumb question....why all the concern with making the bike run 10-12 deg cooler? Engines run high temps and are designed to handle that heat. Unless the radiant heat is broiling your body or causing other problems what is the advantage? I seriously doubt it is going to extend the engines life, so why worry about it? I can see why people would think cooler = better but that is not necessarily the case with an IC engine, especially such a modest decrease. Perhaps on a race engine with constant high temps it could make sense, or if you did a lot of stop and go riding, but for a street bike putt putting along at 70-80 mph on a bit of a romp along the back roads I don't think it makes any difference to go through the effort to drop the temp, and it may be even more thermodynamically efficient running at 175 instead of 160. If it was really important Yamaha, or aftermarket types, would be putting deeper oil pans (more capacity), finned oil coolers, and bigger radiators to drop the temp even more. I dunno', it just sounds like a tweak that won't make any real difference.