Originally Posted by jjinapa
Thanks much for the advice that was posted on this forum relative to the final drive. I just finished using the Moly 60 on the splines. I noticed a small amount of Gear Oil (SAE 80W-90) in the area where the splines insert into the drive shaft. However, the level of oil in the final drive was still close to the bottom of the filler hole. As long as I check the gear oil level frequently, do I have to be concerned about this possible leak?
Also, all splines looked good except for where the final drive inserts into the drive shaft (pinion side). There was rust and splines were approximately 1/8" high - looked to be slightly rounded on edges - but definitely not as bad as I think it could have been (12,000 miles on bike). The front splines were about the same size but had sharp corners (front looked very good). Can I reasonably expect to have this final drive last, say, 10,000 miles now that it's been lubed? (I realize this is a guess on your part.)
Good job, jj...sounds like you got back there jjjuuuussst in time.
If you gave everything a good lube, put averything back together nicely, checked or replaced the O-ring on the FD that seals the Moly in the collar, you will have no problem going 10k before you do this again. Kaw recommends a check & lube at the first 6000mi mark, then not again till 18000mi, so they call for an interval of 12k. I did mine every 10k, no problem. Some say wait till you change tires, but I say no way...my Metzelers were giving me over 20000mi. I'm not waiting that long to do a job this critical, and this easy.
You did put some Moly on the wheel hub to FD gears, right???
A leaking seal between the FD gears and the drive spline could be possible...I'd keep an eye on the FD level for sure. Could be due to previous owner spritzing the base of the input spline w/ some oil. I've done that. Did the oil look 'virgin'....unused?? No leak!
If it had some grey-metallic contamination typical of used gear oil, I'd definitely keep an eye on the FD level....