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Last week after reading everything I could find on clutch and driveshaft splines on my 64K K75 I jumped into the process.

I just completed a 4300 mile trip this summer and needed to replace the tires which would include a rear spline lube but I was not sure if the clutch splines should be lubed as well. My airheads have a well-documented need to keep the splines lubed but I found conflicting information regarding the bricks. Some say to do it, some say not necessary. I was having NO issues with the bike.

I'm a competent hobby mechanic with a well-outfitted shop and extra motorcycles in case it takes more time than planned. So after reading all the procedures I could find it was time to start and plan for an all-day operation.

What I found was that a methodical dissembly/reassembly approach is vital as it is not a quick procedure to remove the transmission to fully access the splines. Good news, the splines are in great shape and were still tacky with lube before cleaning and a good coat of Honda Moly 60. From start to finish - 8 hours of work. I also cleaned the starter and replaced the alternator drive rubber dampers as long as everything was apart.

So... is it necessary to regularly lube the clutch splines? I can't say for sure but I want this fine motorcycle to last a long time and I'll do it again at 100k or so to be sure.
 

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PsyKotic Waterfowl
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Yes, it is necessary to lube the clutch splines on K bikes. Prior to 1990 when BMW hardened the metal of the transmission input splines, the recommended service interval for this was annual. (Overkill if you ask me.) For 90 and later bikes the recommended service interval is 40K.

If you start getting false neutrals when downshifting (5-4 or 4-3 are common) then this is usually a symptom of the clutch splines being dry and warrants a spline lube.
 

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FlyingDuck said:
Yes, it is necessary to lube the clutch splines on K bikes. Prior to 1990 when BMW hardened the metal of the transmission input splines, the recommended service interval for this was annual. (Overkill if you ask me.) For 90 and later bikes the recommended service interval is 40K.

If you start getting false neutrals when downshifting (5-4 or 4-3 are common) then this is usually a symptom of the clutch splines being dry and warrants a spline lube.
Where is this service interval documented? Dealer info? I did get some false neutrals but possibly it's something you get used to. Haven't had a single one since the lube.

Annual service would be quite an expense for somone having to take it to the dealer. I hope my experience helps show that it can be done by a hobby mechanic with tools and time.

Looks like I'll be in again at 100K. Would this usually be about the time for a new clutch?

Thanks much.
 

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PsyKotic Waterfowl
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Discussion Starter #5

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stokester said:
After two commuter rides I can say with certanty the shifting has improved!

I see on the Maintenance Schedule that in addition to the splines to be lubed the swingarm and wheel bearing should be replaced every 25k. Only 25k life for these?
Replace them when they go bad. Not sure why they'd have replacing wheel bearings as a maintenance item other than to generate revenue.

The 12K interval for the air filter is ridiculous too. That air filter is way oversized for a K bike. I replace it every 50K - whether it needs it or not.
 
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