I'm a new rider with my first bike, '75 R60/6, with only 14k miles, which the PO says is accurate! I'm torn between adjustments and minor repairs and upgrades I want to do right now, and just riding the darn thing and worrying about those details next winter. But there are couple of things that look like they want addressing now. I'm not afraid to get my hands greasy (my old Triumph TR-250 made sure of that!), but I'm no expert, and I am new to motorbikes. First of all, my final drive is leaking. When doing some basic lube/maint/tune-up, I removed the final drive filler plug, and oil flowed out. I plugged it again, and wasn't sure what to do next, but I decided that overfull wasn't good, so I let it drain, sopped a little more out to get the level correct, then closed it up. Fine, but where did the extra oil come from? More research suggested that it was likely that the drive shaft oil was leaking down into the final drive, causing it to overfill. I tried to check the drive shaft oil level, and this is where I started to run into trouble. Different resources give different guidelines. My big Clymer manual (800 pages, R50/5 through R100GS PD 1970-1996) says, Insert a screwdriver or metal rod straight down into the center of the drive shaft fill cap hole until it touches the top surface of the drive shaft... the oil level should be 2mm above the end of the rod. This makes sense, and suggests that the drive shaft should be completely immersed in oil at the fill hole. My photocopy of the owners manual (which I found through this forum) says kind of the same thing regarding the oil level, except the wording confuses me: ...insert a suitable rod vertically into the filler opening and allow it to rest on the clutch housing... Clutch housing? Is this a misprint? A friend's smaller Clymer manual says to use some sort of flexible material as a dipstick, and lower it around the shaft to the bottom of the housing, and read the level from there. An accompanying drawing showed a section view with the oil level at about the middle of the drive shaft diameter, rather than having the drive shaft completely immersed in oil at the fill hole. Using his book, we decided that there was enough oil in the housing. I used a small wire to clean out the breather holes in the final drive (in hopes of preventing the oiling of the rear brake), and then cleaned the whole casing with mineral spirits and dried it all off so that it was completely clean of any oil and dirt (of which there was some when I got the bike). Now, two weeks later, there is oil coming from the breather hole below the axle, and also from around the filler plug: So: What's going on here? What should I do about it? What's the correct oil level for the drive shaft housing? Thanks!!!