This is on a 98' GPX250 that i could be buying soon. Just need to know whats required to replace an output shaft seal and where to buy the seal? Also are there any special tools required that you wouldn't find in your average toolbox? I had a quick look at the manual and it seems like theres alot of removing of things and then once you've split the crankcase it just says to remove the output shaft. Is this right? Also is there anything else i should do while I have the engine out? Thanks alot.