BMW K bikes (Bricks)

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1Back to top Go down   What is this?! Empty What is this?! Sun Aug 29, 2021 7:02 am

Clintinz

Clintinz
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What is this?! E3a5a710 I was pulling apart my bike today cleaning it for a paint job and came across this gunk when I took the end off the drift shaft.
It looked like rust or old dried grease but after drowning it in degreaser I came across metal filings. Should I be concerned?

    

2Back to top Go down   What is this?! Empty Re: What is this?! Sun Aug 29, 2021 7:18 am

moriarti

moriarti
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DEFINITELY. The splines look well worn, i would remove drive shaft and clean  /check splines. Sad Sad


__________________________________________________
1984 k100 rs red/black VIN  0004449
    

3Back to top Go down   What is this?! Empty Re: What is this?! Sun Aug 29, 2021 12:10 pm

Laitch

Laitch
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@Clintinz wrote:It looked like rust or old dried grease but after drowning it in degreaser I came across metal filings. Should I be concerned?
Don't worry, there's more where they came from.  Smile

That is an excellent photo. Take another with the camera angled so the end profile of some of the splines' ends can be clearly viewed. If their points are chiseled on one side like a saw tooth when viewed from their ends, mileage on them will be limited but I can't tell how much wear they have. 

These are worn but not worn out.
What is this?! Drivel10

What is this?! Drivel11


__________________________________________________
1995 K75 81,000 miles
What is this?! Usa-lo10
    

4Back to top Go down   What is this?! Empty Re: What is this?! Sun Aug 29, 2021 6:04 pm

Clintinz

Clintinz
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Thanks foe the info. After a good clean up it came away looking like the attached. Tell me I still have life left in it?! Fingers crossed 🤞🏻

What is this?! 8e65aa10
What is this?! E787b810

    

5Back to top Go down   What is this?! Empty Re: What is this?! Sun Aug 29, 2021 9:34 pm

Point-Seven-five

Point-Seven-five
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Those don't look too bad.  I like to look at the flat on the top of the spline, the wider they are the better.  As the splines wear, they get narrower until, when they finally fail, there is no flat top surface visible at all.

What is this?! Dscn3314


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

6Back to top Go down   What is this?! Empty Re: What is this?! Sun Aug 29, 2021 10:14 pm

Clintinz

Clintinz
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Phew! I’ll grease them up and put it back together. Thanks guys

    

7Back to top Go down   What is this?! Empty Re: What is this?! Mon Aug 30, 2021 6:43 am

Dai

Dai
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Just stick to a yearly regrease with Castrol Optimol / Straubags / whatever and they should go on for quite a while yet.


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

8Back to top Go down   What is this?! Empty Re: What is this?! Mon Aug 30, 2021 8:45 pm

Clintinz

Clintinz
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Looks like the problem was on the drive shaft instead. If what you say about the flat tops still applies to the shaft then this looks bad
What is this?! D6329010

    

9Back to top Go down   What is this?! Empty Re: What is this?! Mon Aug 30, 2021 10:34 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Yeah, that drive shaft has maybe 100 miles left in it if you are real gentle on the throttle.

A brand new one is $383 at MaxBMW. If you're not in a hurry, you should be able to find a good one on eBay for $200 or less.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

10Back to top Go down   What is this?! Empty Re: What is this?! Tue Aug 31, 2021 9:51 pm

gabriel

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Hi

Unfortunately your splines are starting to wear out.
How long it lasts you depends on how you ride your bike.
Thrash your bike and they won’t last much longer. If you are gentle with the throttle, you might get many more miles.
It’s up to you.
Make certain your clutch arm, located at the back of your gearbox is greased up.
If not, your clutch cable will snap and replacing it won’t fix the problem unless you also grease the clutch pivot arm.
Good luck.


__________________________________________________
;BMW; 1984 BMW k100..frame number 6228?
1992 BMW K75s
    

11Back to top Go down   What is this?! Empty Re: What is this?! Tue Aug 31, 2021 10:48 pm

MartinW

MartinW
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You can fit a grease nipple to the clutch arm.
Regards Martin.
What is this?! Clutch22


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K75s Hybrid
    

12Back to top Go down   What is this?! Empty Re: What is this?! Thu Sep 02, 2021 2:31 am

Clintinz

Clintinz
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@Point-Seven-five wrote:Yeah, that drive shaft has maybe 100 miles left in it if you are real gentle on the throttle.

A brand new one is $383 at MaxBMW.  If you're not in a hurry, you should be able to find a good one on eBay for $200 or less.
Given that buying over seas in NZ $ then paying shipping it going to come close to $1k and i can’t find one locally. I’m thinking of replacing the whole back end from the gear housing, swing arm, drive shaft stand etc from a k1100rt. This would be similar price (Which I can find locally) and I can fit a larger rear wheel. Question is… can my existing alternator, starter motor and rear diff fit on the k1100rt back end?

    

13Back to top Go down   What is this?! Empty Re: What is this?! Thu Sep 02, 2021 8:00 am

robmack

robmack
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Starter motor and alternator, yes. Rear diff, no. You'll have to get the complete rear end, from the bell housing back.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

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