Well, I might be taking the 636 back to the dealer for work. recently I noticed that up to 6000 rpm the bike doesn't have good power. I thought it might be the clutch slipping but the rpms don't rev high and the bike goes nowhere. But, I changed the oil because it was at 700 miles. I've also adjusted the clutch. I've even tried different fuel. If I pull the clutch in and crack the throttle it revs great, so I don't think it's fuel related. Also, I noticed the the throttle roll on is terrible now as well. Same thing, just no power and the revs come up very slowly. So, my guess would be dealer time! Let me know if anyone has any other suggestions. Because the closest dealer's mechanics tell me to burn 87 octane gas and the wanted to adjust the valves on the first service!