Hello i was riding yesterday on my wr400, everything was fine.. then, after a hard landing after a jump it suddenly started to "klonk" ~4 times/sec (at idle speed), pretty loud sound that i felt through out the bike. i instantly hit the kill button and havent started it since then. it sounded like something braked loose in the engine after the landing. today i opened the top and looked at the camshafts, see if everything was in order there and it seems to be. have somoene experienced this before?