Good day everyone, i would very much appreciate it if someone could shed some light on a problem i have been dealing with for sometime now on my 02 CR250. After a trip to a local MX track about a year ago i noticed the next time i rode the bike whenever i would accelerate sharply or lift the front wheel in any way, the forks would slam back down with a terrible knock( as if there was nothing slowing it down and the springs just forced it to bottom out so to speak). i am very inexperienced with suspension but straight away knew there was a problem. my immediate reaction was to play with rebound settings and to have a look inside, in which i saw no oil in the top chamber of the fork, but not knowing anything about them i still didnt have much of a clue..... Anyway, not riding the bike much i left it to sit for a while and then finally took it to the local bike mechanic and told them the problem. I returned a few days later and the mechanic said there was no oil in the top chamber... so they had refilled it and the replaced the seals. After a few rides the problem has returned and im wondering what would cause this oil in the top chamber to escape like this? i would like to aviod having to take it anywhere again..... any help is welcome!!