Hey! I bought my '01 xr400 2 weeks ago. I love the bike, but on friday as I was riding home from work. I noticed a rather loud clicking sound from the engine. The noise can be heard when turning the engine with the kick. I thought that this sound probably had been there for some time. And had increased in strenght over these 2 weeks, once you hear a noise you "REALLY" hear it. My first guess was that it was the valves, but it were'nt. They where very little adjustment needed to get them within the tolerance. And yes the auto decomp mechanism were'nt holding the rhs exhaust valve. So I took off the cylinder head cover and inspected the rocker arms etc. Everything there is fine the same with the cam axle. But I do wonder how much slack there should be on the auto decomp mechanism. I mean this might be alot too loose. I'm able to move them quite alot (3-4mm). Like this. It generally feels way too loose. But this might be the way it should be. Any pointers are welcome. Don't want to spend a lot of money on a bike I just bought... Edit: Can it be that the cam chain is too loose?