I have a 2009 Honda CRF 450 bike. It has always started hard. I recently put in a fresh top end and new valves. Took it to the Honda dealer as it continued to cut out. They hooked it up to the machine, no problems noted. However, I asked them to "get it hot" and then put it back on the machine. I guess the stator was showing a low current. So of course, they put in a new stator. That night I took it out for a test ride, it started after 5 kicks which previously took up to my leg falling off (10-20 kicks). Ran awesome after a 1 hour ride through the woods ect. Took it to a hare scramble this weekend, 3 and a half hours away. Again, started great. I got off the line with 1 kick. Bike ran amazing for 1 hour and 30 minutes. Then it started to bogging out and basically falling on it's face. The more throttle I gave it, the less power it gave and would want to die if I didn't let off the throttle. I took it back to the Honda dealership/service department. They have no idea what it wrong. I called the HONDA CUSTOMER SERVICE and they stated they didn't have any "technician's" to help me and that the Honda Dealership/service department has contacts they can call to help them. Nobody seems to know what the heck is wrong with it. Everyone has their assumptions but I have put more money into the bike than it's worth. I just want it start, run and not cause me more DNF's. Very FRUSTRATED and CONFUSED. Anyone have or had this problem because I welcome to any help/suggestions you have. Thanks!