1994 K75 Transmission mystery

[k75mark]

I just finished rear engine seal and clutch disc replacement on my !994 K75, it shows 130,000 miles on the odometer.It now starting on its third seal and disc.

When disassembling for service I also planned to replace clutch rod seal as before,it was showing signs of wear and leaking. When I was wrangling the transmission back on,I tilted transmission back a little and gear oil poured out of the passageway that the clutch rod passes thru. Maybe 4oz or so.

I surprised to see that volume, it smelled of Sulphur, confirming gear oil. Clutch housing had coating of engine oil residue.

I stumped on this. Where could the gear oil be coming from? The seals on the trans input spline were dry. Possibly the trans output spline boot was where the fluid came from, I investigate tomorrow.

Any similar things happen like this to you?

[k75mark]

I just finished rear engine seal and clutch disc replacement on my !994 K75, it shows 130,000 miles on the odometer.It now starting on its third seal and disc.

When disassembling for service I also planned to replace clutch rod seal as before,it was showing signs of wear and leaking. When I was wrangling the transmission back on,I tilted transmission back a little and gear oil poured out of the passageway that the clutch rod passes thru. Maybe 4oz or so.

I surprised to see that volume, it smelled of Sulphur, confirming gear oil. Clutch housing had coating of engine oil residue.

I stumped on this. Where could the gear oil be coming from? The seals on the trans input spline were dry. Possibly the trans output spline boot was where the fluid came from, I investigate tomorrow.

Any similar things happen like this to you?

So I took a good look at the back of the transmission today as I cleaned that area up and replaced the clutch rod seal.Area around the seal was messy,I also got a good look at the Transmission output seal.It looked in good shape,dry and no indication of a leak there.

I now thinking input seal for transmission,it looked dry after replacing RMS and clutch disc.Could be a small leak there possibly  using the clutch rod to transfer the gear oil across to the clutch pack and spring spraying oil all over the clutch disc and pressure plate,also following the rod back to the rear rod seal cup and accumulating there.
Anyone else have this happen before?
Google search has little info on this. 

[Laitch]

When I was wrangling the transmission back on,I tilted transmission back a little and gear oil poured out of the passageway that the clutch rod passes thru. Maybe 4oz or so.

I surprised to see that volume, it smelled of Sulphur, confirming gear oil. Clutch housing had coating of engine oil residue.I stumped on this. Where could the gear oil be coming from?

Could be a small leak there possibly  using the clutch rod to transfer the gear oil across to the clutch pack and spring spraying oil all over the clutch disc and pressure plate,also following the rod back to the rear rod seal cup and accumulating there.

The clutch rod is not transferring oil to the clutch disc, leak or no leak. In fact, worn clutch rod seals are uncommon but the seal can deteriorate in a neglected brick.

Here's a reason for the leak. There is an opening in the clutch rod cavity that leads downward through the transmission case.Vapor and splash from the transmission can lubricate the rod but the rod doesn't need much. If you tip the transmission backward, transmission oil can migrate up that channel and then pour from the boot—especially if the transmission fluid level is too high. Next to tipping the transmission, the common cause for the leak is poor clutch adjustment. A torn boot won't help either. Be sure you complete a basic clutch adjustment after you finished with what you're doing. Enlarge the attached jpeg—or access it from the link below it—and read all about it.

[k75mark]

Thanks for the TSB for the clutch rod leak.
I have now put the new Boot in place after cleaning the area around the throw out bearing. Adjusting the cable to spec will be next.
The Mystery is, there really was a couple oz worth of Tranny oil spilt out of that seal. I never had any gear oil loss when I checked it few times between changes over the Twenty-Five years of ownership. Earlier I used the tool roll Dipstick, it was below the full line with oil on the tip only. Looked at my maintenance records for this bike, been four years/4000K since last trans oil change. It Been a little neglected with five bikes in the Stable.
The entire inner surfaces of the Bellhousing had a fine layer of oil on it and Clutch plate fouled but not slipping and the oil had a petroleum odor to it.
So, I did the proper thing with the Rear Main Replacement and Clutch Disc with a little extra surprise with the Clutch Rod Seal.
Like the TSB says (Improper Clutch Adjustment). Probably quite a while, allowed Gear fluid to build up till boot could hold no more and leak.
I will go with that Information and Ride it.     Also Change the Gear Oil