I was looking at an original seat full of frikin dust/dirt over the white lettering...But, now, looking for a forum thread to ask if a set of 1972 LS 2 ft. and rear turn signals will cross over onto a '72 XS650. Sort of looks like it.
These seals need to be very thin because there's not much cam sticking out. The originals are only 5mm thick so a 7mm one might be too thick. I think that's what the troublesome MikesXS seals are. They also market them as an improved version with a triple lip. But all the extra lips in the world will do no good if the seal's too thick and they don't make it onto the end of the camshaft.
I just ordered some 6mm double lip seals plus the seals Jim suggested (24mm vs standard 25mm inner diameter). Gonna nip these leaking seals one way or another.
Mailman, I noticed looking at your seal pics in post #3297 that the seal in the 1st pic looks to be seated in on the cam a little more than the seal in the second pic. I think I can make out the seal number (size) in the 1st pic and it looks like it's a 5mm thick seal. Is the seal in the 2nd pic possibly a 6mm thick one? Nicely greased advance rod bushings by the way.
Well, I think I finally resolved the leaking cam seal issue. I ordered two of of the 6mm wide seals (vs 7mm which is what Mike's ships) and thought I'd try the 6mm x 25mm ID seals first before giving the seals Jim mentioned (24mm ID) a try. I eliminated the paper gasket behind both housings, used just the rubber o-ring and aircraft sealer on the mating surfaces, and pressed the new seals in so they slightly protrude beyond the housing surface. You can see from the first "before" pic how the lip of the seal was right on the edge of the camshaft. The "after" pic shows that I have a good 1mm of the camshaft protruding beyond the new seal. Same now on both sides. Went for a good 20 mile ride (finally had a day over 50 degrees) and so far it's bone dry. Will report later if anything changes. Also polished the cam shaft a bit with a scotch pad before installing new seals. One thing I noticed is that I could hand press these new seals in, so just a thin coating of aircraft gasket sealer was applied to the mating surfaces prior to install. I then let it dry good before taking it for a run. So far so good!View attachment 166943 View attachment 166944 View attachment 166945
..... and the seals Yamaha now sells should be even better because they're only 5mm thick.
It may have more to do with giving the seal a new area to ride on. Just a thought. We used to put Speede-Sleves on harmonic balancers so the seal would have a new surface to seal on. Worked well.The proof's in the puddin' as they say... and I hope your seal stays dry Larry... I'm just at a loss to understand why giving the dust lip more purchase is stopping the oil.
Could very well be it Greg. In which case... might be able to use an exacto knife and trim the inside of an existing seal so it seats further in without hitting the cam bearings.It may have more to do with giving the seal a new area to ride on.
Only thing that makes sense to me. Then again what do I know.Could very well be