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K bike splines

Posted: Thu Apr 26, 2018 7:47 am
by andys
I fancy a K100/1109 but something that puts me off is the suggestion I'm hearing that the output shaft splines have to be lubricated at 50,000 mikes
Pretty much every bike I've seen has about that mileage.
Personally I cannot understand it.
A spline connection is more or less a friction fit.
There should be no movement or play in it at all, so apart from a bit of lubrication at the factory for easy assembly, I cannot understand rhee need to strip and lubricate as part of the service regime.
If the spines are wearing out, that suggests to me an alignment issue.
Perhaps someone could enlighten me.

Re: K bike splines

Posted: Thu Apr 26, 2018 9:18 am
by Bill Smithson
I fancy a K100/1109 but something that puts me off is the suggestion I'm hearing that the output shaft splines have to be lubricated at 50,000 mikes
Pretty much every bike I've seen has about that mileage.
Personally I cannot understand it.
A spline connection is more or less a friction fit.
There should be no movement or play in it at all, so apart from a bit of lubrication at the factory for easy assembly, I cannot understand rhee need to strip and lubricate as part of the service regime.
If the spines are wearing out, that suggests to me an alignment issue.
Perhaps someone could enlighten me.
The shaft is not a friction fit it's a sliding fit to allow for the up and down movement of the suspension. It does need periodic lubrication.

Re: K bike splines

Posted: Thu Apr 26, 2018 9:37 am
by andys
The up and down movement surely can't be incorporated into the spline joint itself.

Re: K bike splines

Posted: Thu Apr 26, 2018 10:45 am
by Bill Smithson
The up and down movement surely can't be incorporated into the spline joint itself.
It does through the universal joint which incidentally is lubricated for 'life'. Have a look at this link which explains things better than I can.
http://web.eecs.umich.edu/~deroo/bike.d ... epair.html

Note this paragraph. - The spline is composed of interlocking lands on the two shafts which are cut parallel to the shaft. Lands are to splines what teeth are to gears. The way the lands are cut, the two shafts can slide freely on each other longitudinally along their shafts, but rotationally they must rotate together. Radially, the two shafts will also be kept concentric by the spline.

Re: K bike splines

Posted: Fri Apr 27, 2018 10:41 am
by krankshaft
Hi, Andy
Some people recommend greasing the driveshaft splines every rear tyre change ( or inspection at least), this is
not difficult and involves removing the final drive, the 50,000 mile figure refers to the clutch splines on the gearbox input shaft
and is a bit more work but there is nothing extremely difficult and no special tools are needed.
If you are after a K-bike and find one with 50,000 miles, buy it and do the splines yourself, you'll get to know the
bike and be confident about your splines.
Ride safe
Jim

Re: K bike splines

Posted: Fri Apr 27, 2018 2:23 pm
by buelllightening
For info,I checked my gearbox splines at 48,000 miles and the clutch and gearbox splines were both very badly worn ,had replace both .

Re: K bike splines

Posted: Fri Apr 27, 2018 8:31 pm
by andys
I once met a guy who had a K100RS that he'd owned from new, which had done over 130,000 miles.
When I broached the subject with him he was totally mystified.
Luck of the draw I suppose.
Are there other shaft driven bikes from other manufacturer's where this maintenance has to be done.

Re: K bike splines

Posted: Sun May 13, 2018 6:31 pm
by Responderman
My K75 has 40k on the clock, so while I changed the tyres I took a look at the splines both ends on my prop shaft and found negligible wear if at all. The job is really easy to complete using a manual. So while I was in there I repacked them with the black grease (can't remember the name of it) I know this has no indication on the condition of other bikes but it goes to show it isn't set in stone that's going to be the condition of all of them.
The bikes are superb generally.
Hope this will help you

Re: K bike splines

Posted: Mon May 14, 2018 1:32 pm
by andys
I met a guy yesterday with a K75 funnily enough.
His bike had 90,000 miles, and he told me the splines were toast.
He got new splines welded on.
Motoworks do it apparently.

Re: K bike splines

Posted: Wed May 16, 2018 11:25 pm
by Isettaman
It's Motobins who weld a new end onto your drive shaft.