I recently returned from a 2, 500 mile trip on my CTX700N. Great trip, the bike ran like a champ. On my return, I had about 10,500 miles so I thought as long as I was cleaning the chain and a few other things, I would replace the air filter (first time). I bought a K & N HA-7012 from Revzilla. After putting everything back together, I had difficulty starting the bike. I recall a discussion from earlier that with a new style air filter the computer needs to figure out the air flow. I eventually got it started. Now it starts right up, but today, I finally had time to take it out on the road to check it out. What I found was the following: the engine seemed a little louder than it did before replacement; acceleration is very slow; it takes forever to get up to 60 mph; and it seems to me like the engine was running hotter than it normally does, though it may be my imagination. The only engine work I did was the air filter, so the problem must be related to it. Has anyone had a similar experience? Or does anyone have a suggestion for trouble shooting?