Backwards powervalve sucks gunner. But freshening it up yourself is peace of mind too. I have both a 2002 zr 440 6 tower primary and a roller secondary but I don't want to part with them either. That 02 primary is pretty rare as the Polaris patent had run out allowing Cat to copy their design with the captured towers. Those 440's were hard on those 9 tower clutches lol! Can't wait for more on this sled.