St1100 final drive

Road Slug

Road Slug

Joined
Oct 7, 2024
Messages
39
Age
60
Location
Idaho
Bike
St 1100
I want to remove my final drive and slop some moly on the splines of the driveshaft.
Does the driveshaft align itself in the splines when I install the final drive and tighten the 4 nuts?
 
Road Slug said:
Wheel end. Does the differential just slide on the splined of the driveshaft then tighten the 4 nuts?
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You don't need to remove anything other than the rear wheel.
With a small brush, you can easily apply moly to the splines in the hub in place.
If you want to moly the 'teeth' in the drive shaft itself (which I have never done on any of my 4 ST1100s), AFAIK 'yes' is the answer to your question.
 
There is a procedure for installing the differential. Basically, the 4 nuts on the swing arm/diff. are the last thing to tighten after the wheel and axle installation.
 
I removed the differential unit when I refurbished our 1991. Cleaned and greased everything using the lubes specified in the manual and replaced all the seals. The moly on the hub drive splines looked a bit dried but the rest of the unit looked just fine. Had to 'wiggle' the unit a bit to properly engage the splines but it was no major effort. Did get fresh moly on my fingers....much harder to clean off than the metal parts.
 
Such would also be an opportunity to treat the entire swing-arm with some cavity protection (WAXOIL or alike...)
 
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I never took the driveshaft out of either ST (just lubed the splines when changing the rear tire)- I use UP as my benchmark- with all the miles he’s put on the ST1100s and relatively few issues experienced, I think I’ll just leave things alone and keep riding. Sometimes over maintenance can bite you. I just swapped the coolant in both bikes (I know, different topic) after ~ 8 years- looked like new but now I can ride on for quite a while with just tire and oil changes.
 
Oldbikefixr said:
I removed the differential unit when I refurbished our 1991. Cleaned and greased everything using the lubes specified in the manual and replaced all the seals. The moly on the hub drive splines looked a bit dried but the rest of the unit looked just fine. Had to 'wiggle' the unit a bit to properly engage the splines but it was no major effort. Did get fresh moly on my fingers....much harder to clean off than the metal parts.
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Yes that the answer I was looking for. Thank you.
I had two yamaha shaft drives that you were to use moly on the splines or they get this red rust dust and kills the shaft and differential splines. When that happens, the final drive is trashed.
 
Road Slug said:
Yes that the answer I was looking for. Thank you.
I had two yamaha shaft drives that you were to use moly on the splines or they get this red rust dust and kills the shaft and differential splines. When that happens, the final drive is trashed.
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FWIW, this is something that never gets mentioned around here as being a maintenance issue, so its probably not necessary, but if it makes you feel better, do it.
 
dwalby said:
FWIW, this is something that never gets mentioned around here as being a maintenance issue, so its probably not necessary, but if it makes you feel better, do it.
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I have seen pictures and videos of the driveshaft tube full of corrosion and rust.
Inquiring minds want to know!
 
dwalby said:
any chance those were bikes from the UK?

Those guys are notorious for rusting out swingarms and anything else made of steel because of the way they salt their roads during the winter.
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Possibly. Could have been Australian also?
 
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