I was moved to put this thread together because we lost the images (at least for the time being) from Big Fitz’s thread that can be found here: http://xjbikes.com/forums/threads/tach-gear-housing-oil-seal-replacement-w-pics.19538/ His words are still Gold. If I were you, I’d read through (and follow) his process first. Below is what I did just this afternoon in the driveway… honestly it didn’t take very long. Maybe a half hour from start to cleanup. Just a few weeks ago, I brought a “new” RJ home. The seller stated that it had a head leak and had intentions of getting it fixed, but just never got around to it. He even gave me the brand new OEM head gasket still sealed in plastic. After giving her a thorough scrub down, it appeared that the majority of the oil mess was coming from the tachometer drive gear. The lower end of the motor is a bit oily as well, but I have a sneaking suspicion that it’s a cheap-o oil filter cover gasket that is the offender. Here it is after the initial scrub… Not bad! First unscrew the outer collar. I had to “break” it with a pair of pliers, but once free, she came right off by hand. Pull your tach cable out and swing it out of the way for the time being. At this point I removed the threaded adapter that had the giant flat head slot across it. I used a thin spackle knife to break it free and then it unscrewed pretty easy. Remove the “stopper” (Yes, that’s it’s name) with a H5 Hex Key.