BMW K bikes (Bricks)

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gabriel


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Hi

I recently purchased a K75s and decided to check the clutch and input shaft splines due to a notchy gearbox.
The splines are in excellent condition.....phew....
I noticed the clutch splines were starting to wear and a few rivets from the clutch had come loose.
My question...should I template the rear main seal.
There is no oil leak but there was a thin film of grease on the inside of the bell Housing? It was not completely covered in grease.
I prefer not to disturb the flywheel nut.
Any opinions?

Regards

Gabriel


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;BMW; 1984 BMW k100..frame number 6228?
    

Two Wheels Better

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Moderator
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With rivets loose how soon will it be 'til you're back in there? Unless there's a strict budget I'd do the job now. Hint: it is possible to re-use the gland nut and thrust washer. Just change the o-ring whilst tending to the rear main.


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1987 K100RS, Big Block '93 K11/K12 hybrid, '09 K1300GT, '07 K1200R, '04 R1150RT, '95 R100 Mystic, '77 R75/7.
Have we accomplished half of what we dreamt we would? There may still be time.
    

duck

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Life time member
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No. Why fix something that isn't broken?

Even though I've never had a rear seal go on any of the 20+ K bikes I've owned, I do realize that the rear main seals are made of rubber that is now getting on in years. As preventative maintenance, I've recently started using Mobil 1 high mileage oil. Instead of using regular Mobil 1 15-50, I now do oil changes with a 50/50 mix of the regular Mobil 1 15-50 and Mobil 1 high mileage 10-40. The high mileage oil (which costs about the same) has additives that supposedly:

1) Recondition old seals

2) Have more detergents to clean out built up gunk in the engine. (Which ideally will reduce the chances of starter sprag issues.)


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

gabriel


Gold member
Gold member
Hi

Just wanted to say thanks for both replies.
I have decided to replace the friction plate due to the missing rivets.
I have neither the confidence nor the tools to go any further with the repairs.
I only replaced the clutch assembly on my k100 and two years later, no issues.
The gear changes are so much smoother on my k100.
Im hoping it will be the same for my k75 after my repairs.
Must get that order to Motobins submitted ASAP

Regards

Gabriel


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

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