I've got a 2000 cr 250 that I use for a trail bike. sad to say the bike doesn't get used as much as Ide like to . The last time out I thought I noticed a vibration that would come and go. Having been told that year cr's viberated I didn't think too much about it. The next day I notice a small oil spot under the bike below the counter shaft sprocket. My question is are the two related or is it just an old dry seal ? Do I have a bearing starting to go trashing the seal ? Any one delt with this,any failing commons? Thanks again any helps allways appreciated.