BMW K bikes (Bricks)

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1Back to top Go down   K100RS Final drive breather Empty K100RS Final drive breather Fri Jul 03, 2020 5:45 am

GeoffP63

GeoffP63
active member
active member
Greetings,

A very strange thing happened today that I'm going to put down as a glitch in the Matrix, disturbance in the force etc etc.

I pulled the cover off the bike to find gear oil had leaked from the breather outlet on the top of the final drive.

It had dripped down the final drive over the speed sensor and onto the tyre and rim.

I did some research and found many others that experienced a similar issue but in most cases, no plausible explanation.

Most say it happened once after many years of riding and then never again.

In my case;

The bike has NOT been on the road for 12 months
FD has the correct amount of gear oil (as per manual)
Rear wheel has only been rotated by hand (rarely) 
It is undercover on centre stand
Outside temp has not been above 17C/62F for weeks

Weird..... Question

Anyone else heard or experience this?

Regards,

Geoff



Last edited by GeoffP63 on Sun Jul 05, 2020 10:28 pm; edited 1 time in total


__________________________________________________
1985 K100RS
50,000 Ks
    

2Back to top Go down   K100RS Final drive breather Empty FD leak Fri Jul 03, 2020 10:51 am

caveman

caveman
Platinum member
Platinum member
Are you sure it isn't leaking from the shock?

    

3Back to top Go down   K100RS Final drive breather Empty Re: K100RS Final drive breather Fri Jul 03, 2020 11:28 am

GeoffP63

GeoffP63
active member
active member
100 % sure it's not the shock.
I found a number of posts from owners with the same story.


__________________________________________________
1985 K100RS
50,000 Ks
    

4Back to top Go down   K100RS Final drive breather Empty Final drive Sat Jul 04, 2020 4:57 am

daveyson

daveyson
Life time member
Life time member
Haven't had the problem, haven't looked.

Have you had a sticky beak?

Like spose it's got a valve closed by a spring, and the spring is crappy, or something like that.


__________________________________________________
11/1985 bmw k100rt (late model)  Vin. 0090567
 ~120,000 km
    

5Back to top Go down   K100RS Final drive breather Empty Re: K100RS Final drive breather Sat Jul 04, 2020 3:47 pm

Laitch

Laitch
Life time member
Life time member
It's time to set up the night vision game cameras in the garage.

What is the correct amount of oil? Did it leak from the top of the vent's capped sleeve or from the o-ring around the base of the sleeve?

I hadn't heard about it but now I've read about it in several posts.  Your research seems to indicate it happens then never happens again so the thrill is over for you. I'm still in the queue though. cheers


__________________________________________________
1995 K75 81,000 miles
K100RS Final drive breather Usa-lo10
    

6Back to top Go down   K100RS Final drive breather Empty Re: K100RS Final drive breather Sun Jul 05, 2020 1:14 am

GeoffP63

GeoffP63
active member
active member
Haha, yeah I have a security cam out there.
I went through the footage expecting to see a possum with it's mouth over the breather....

It was a nice distraction from my on going starting issues.

    

7Back to top Go down   K100RS Final drive breather Empty Re: K100RS Final drive breather Sun Jul 05, 2020 1:29 am

Laitch

Laitch
Life time member
Life time member
GeoffP63 wrote:I went through the footage expecting to see a possum with it's mouth over the breather....
At least it wasn't a neighbor. Smile


__________________________________________________
1995 K75 81,000 miles
K100RS Final drive breather Usa-lo10
    

8Back to top Go down   K100RS Final drive breather Empty FD breather Thu Jul 16, 2020 1:22 am

daveyson

daveyson
Life time member
Life time member
Pulled the cap off today. No valve on mine, just a plastic cap. Should pull straight off, and snap back on with a click sound. Maybe clean it if dirty. It might be worn out and loose. It might be the wrong oil type, some oils foam for example.


__________________________________________________
11/1985 bmw k100rt (late model)  Vin. 0090567
 ~120,000 km
    

9Back to top Go down   K100RS Final drive breather Empty Re: K100RS Final drive breather Thu Jul 16, 2020 4:43 pm

Two Wheels Better

Two Wheels Better
Moderator
Moderator
One day some years ago I walked into the garage to discover a clean dribble of gear oil down the final drive, onto the rim, tyre and floor. I'd refilled the oil a year earlier, always measuring out the required amount in a verified beaker, and done at least 5 or 6,000 kms in that time. For safety's sake I checked the level and found it down, but only a smidge. So I left it as it was - just below the base of threads of the filler plug and cleaned up the mess, checking the cap by removing and cleaning it off as well. It never burped out any oil again. It's the only time on any of my K's that this had happened. I reckon it was just reminding me that it was there, like some vaporous ghost in the machine.


__________________________________________________

1970 R60/5, '77 R75/7-R100, '85 K100'87 K75C, '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, #1 '06 K1200R, #2 '06 K1200R, '07 K1200R, '09 K1300GT, '13 R1200RT-P & 2022 S1000XR

"Do you ever read any of the books you burn?" "That's against the law!" "Oh, of course."
~Ray Bradbury, science-fiction writer (22 August 1920 - 2012)
    

10Back to top Go down   K100RS Final drive breather Empty Re: K100RS Final drive breather Fri Jul 17, 2020 6:01 am

Dai

Dai
Life time member
Life time member
I hate you lot. Mine did it about three days ago - just enough to discolour the dirt on the drive box. It's catching, I tell you, catching. Some damn side-effect of KPox.


__________________________________________________
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
    

11Back to top Go down   K100RS Final drive breather Empty Re: K100RS Final drive breather Fri Jul 17, 2020 9:03 am

GeoffP63

GeoffP63
active member
active member
Dai wrote:I hate you lot. Mine did it about three days ago - just enough to discolour the dirt on the drive box. It's catching, I tell you, catching. Some damn side-effect of KPox.
I'm sorry a brought it up Dai....

That is so weird.


__________________________________________________
1985 K100RS
50,000 Ks
    

12Back to top Go down   K100RS Final drive breather Empty Re: K100RS Final drive breather Fri Jul 17, 2020 9:39 am

92KK 84WW Olaf

avatar
Life time member
Life time member
My 1984 K100 RT had leaked......from the gear box into the drive shaft and the rear splines...and leaked at the final drive. Splines and universal joint perfect as a result. Clutch and rear main seal replaced and did all the other seals at the same time.

10k miles later leaks again at the final drive seal so it got a bearing at the same time.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 49,840 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

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