Have you ever done something that has you wondering what the heck happened? I sure did! Last week I thought that since I haven't ridden my XR400 for about 6 months I would check the valves to see if they were in need of adjustment. Although I have done this a number of times over the years, I always use the shop manual for reference. With the exception of the right exhaust valve being a little tight, which I adjusted, all went well and I was quickly (for me) done. When I went to kick it over, I realized that I somehow managed to render the auto compression relief ineffective. When the piston would get to TDC it would barley budge. Sort of like it had extreme compression. I could get it to start and run (which it did very well) but I felt like a little girl trying to kick start a Harley. Any ideas what happened? And better yet, how do I fix it? If you know, would you please help me? Thanks for your time and assistance.