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Watery sludgy gear oil?

  • Thread starter Thread starter Randomize
  • Start date Start date
A follow-up for anyone who has a similar issue and finds this thread: Shifting is a little stiffer than it was before but works fine. I'm guessing the nasty oil was providing some extra friction for the synchros. It has a tendency to want to bounce off of first gear if it's still idling high from the choke but is fine once it warms up and the choke can be backed off.
 
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Brendan W said:
If you haven't changed the fork oil yet be prepared for more of the same in there. Did I mention brake fluid ?
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Replaced fork oil and seals last night. It was dirty but not chunky or anything unusual like that. Rebuilding all three calipers and the front MC is up next.
 
Randomize said:
Replaced fork oil and seals last night. It was dirty but not chunky or anything unusual like that. Rebuilding all three calipers and the front MC is up next.
Click to expand...
Let me guess, a dark grey colour. A lot of it will be bits of ground spring and if the bike has sat for any time will be difficult to dislodge the last of it. I'd plan another oil change sooner than usual say at the next sump oil change.
 
Randomize said:
So I cracked open the gear oil (the gear box, not the shaft)...
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OK, the "gear box" does not have its own oil supply. :-k

Randomize said:
The shaft oil showed no signs of water or sludge.
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The shaft itself has no oil. :-k

Randomize said:
I'm guessing the nasty oil was providing some extra friction for the synchros.
Click to expand...
This would be a neat trick, because there are no synchros. :-k



The oil that was draining in the video was from the "secondary drive". That is directly associated with the shaft drive. It only lubricates the right-angle gears between the transmission output and the shaft input.

Not sure what you are calling "shaft oil", as the shaft itself is dry. At the front, there is a flange ahead of the u-joint that bolts to the ouput of the secondary drive. At the rear, there are splines that slide into the input of the final drive.

.
 
Steve said:
OK, the "gear box" does not have its own oil supply. :-k
Click to expand...

Yes, you're right. I had it my head that it was the gearbox but it's actually just the head of the shaft. The manual calls it "Gear Oil" so you can understand the confusion.
 
Brendan W said:
Let me guess, a dark grey colour. A lot of it will be bits of ground spring and if the bike has sat for any time will be difficult to dislodge the last of it. I'd plan another oil change sooner than usual say at the next sump oil change.
Click to expand...

Will do.

It was more brown than grey, actually. The springs and spacers were grimy but not worn. It wasn't until I flushed some ATF through that any grey came out.
 
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