I have a question for anyone that might know about the 2004 crf 250x. I started my bike to let it warm up and I took it off the choke and it wasn't fully warmed up. The motor started making a chattering noise before it stalled out. I restarted the bike, idle was low, chattered again, it stalled and made a clank sound. Like the motor had kicked back. I tried to restart the bike and it backfired out of the pipe. I tried one more time, the bike started up and started making a tapping/knocking sound. I shut the bike off instantly, I pulled the valve cover off to make sure there was no problem in the top end. Everything looked fine. I spun the motor over a few times with the valve cover off. I placed the valve cover back on, put the coil wire back on, I started the engine and it was now running perfect, no noise or anything. I'm trying to find out what the noise may have been. Worried that I should booking for a bigger problem. It seems to run perfect right now though. If any input of what it could have been please let me know. Thanks.