heres the deal i have a 1987 kx500 that runs like its brand new starts on the 1st kick and has never let me down never!!! bike runs like a raped ape!!! heres the bad thats stressing me out like crazy when i bought the bike it had a small oil leak from the shifter shaft. I drilled it out and put a new seal in that leaked even more so i drilled it out again roughing up the case very slightly and it even leaks more now!!!!!!! it drops like a drop every 10 seconds but its soo stressful because im a perfectionist when it come to my toys and i dont have the heart or skill to split the case and buy a new half of the case my bike runs perfect why would i do that please consult me thank you guys!!!