I have a 2006 Honda CRF 250R which I have been able to bump start with no problems up until now. It kick starts perfectly fine and runs fine. I have no problems with the clutch or gears when I'm riding it. It rolls freely in neutral and in gear with the clutch engaged. But if I roll it down a hill in gear with the clutch engaged, and then release the clutch, the rear wheel locks up hard sliding on the dirt and the engine does not turn over at all. It doesn't matter if I'm in 1st or 2nd gear, same result. This bike used to not do this and would instead turn over just fine using this exact method. Any advice on how to fix this? A little more background: My bike started giving me more and more problems kick starting it so I checked the valves and sure enough they were worn and will need replacement. I re-shimmed just this one time so I can get a few more hours out of them before I have to strip it down. When I took it back to the track I still couldn’t kick start it and the kick was very stiff starting from the click so I tried bump starting it which is when I discovered my problem. Back at the garage I found out I missed the timing by 1 tooth gear. I adjusted and kick feels perfectly normal now and kick starts fine. But bump start problem still exist.