Hi, I bought a 2000 DR-Z400E about 2 months ago. A week or so back I had the battery recharged because it was really low. It ran great at the desert, but it was getting harder to start and eventually I had to choke it with full throttle engaged just to fire it up when the engine was warm. The last day there the battery was about dead so I hooked it up to a jumper / charger that a friend had. After that the battery seemed fine but it wouldn't start. A friend whos a mechanic said to change the spark plug. I did that but still no start. It's acting like it has low compression, the engine starter turns over but nothing happens. The friend then told me it was likely to be the valves out of adjustment. I had a minor suspicion it could be the carb but I doubt it. My question is, has anyone had the same problem? I thought these bikes were supposed to have a solid reliable valve system. While I don't deny it could be the valves I just wanted to see if anyone has had the same issue and fixed it so I can better educate myself before I start stripping the bike apart.