I know it's not a Honda but I'm tring to convince him to covert over. But anyway. His bike loosed power after 8K, it boggs down and when it get to 9k it starts to startle out. But up to 8k its ok. his bike redline 11k. and now it doesn't get that far. During the winter he chg. tha plugs, remove the airbox and filter, and replace the throttle. So once it was put back together it want go over 8K. It was ok last yr. He has a PC but it has been mapped yet but it was like that last year and didn't have any problems. He can't seem to find out what's the problem. He had the bike broke down because he was getting it paint so he had to remove the tank also. what can cause a power loss. now his bike barely get upto 120mph when it used to get over 160 w/ no problems. He is going to have it dynoed but just wonder about the problem.