BMW K bikes (Bricks)


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1Back to top Go down   Sprags and HES Empty Sprags and HES Mon Feb 13, 2023 1:38 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Is it my imagination, or are there fewer problems with sprag clutches and HES sensors the past couple years? 

Seems at one time there was at least one active thread dealing with a slipping sprag or a bike that died after 20-25 miles.  I can't recall more than a couple threads in the past couple years.  Are owners more diligent with servicing their oil now?  Have we weeded out the marginal HES units?

Seems to be fewer throttle body bushing leaks as well, the only consistent problem seems to be with the old Z tube and fuel systems. 

Are these old beast falling into the hands of owners who take better care of them now?


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

2Back to top Go down   Sprags and HES Empty Re: Sprags and HES Mon Feb 13, 2023 3:48 pm

92KK 84WW Olaf

avatar
Life time member
Life time member
Better approach to oil changes. But I also think a lot of the older bikes are now landing with caring owners.

I have Ks for 13 years and now regard Z pipes, vacuum caps, vacuum hoses etc as service items.

As an example my K100RS has been acting up lately. It bugged me because last April I replaced the lot before a trip to France. But it was showing usual running too rich problem. Yesterday polishing it for the purpose of checking over everything I noticed the vacuum pipe was cracked. I was happy enough to see that. So today as a short term fix I used tape over the pipe to seal it off. Fired it up and she ticked over nice and sweet at 900rpm. Now to actually replace the pipe. Easy now since the lot was out in April and copper grease is everywhere.


__________________________________________________
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 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 48,061 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 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
    

3Back to top Go down   Sprags and HES Empty Re: Sprags and HES Mon Feb 13, 2023 4:37 pm

duck

duck
Life time member
Life time member
Better oils with better cleaning additives may also help.

I now do a 50/50 mix of Mobil 1 15-50 and Mobil 1 High Mileage 10-40. The HM oil has additives for cleaning as well as seal reconditioning. My theory(hope) is that the HM oil additives will keep the sprag clean and also help keep the water/oil pump seal and rear main seal from failing.


__________________________________________________
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
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

4Back to top Go down   Sprags and HES Empty Re: Sprags and HES Mon Feb 13, 2023 5:06 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Yes, I think that better additive packages and better owners may be a big factor.

Vehicles(autos, motos, and boats) go through life cycles where they are new and well cared for through pride of ownership, old age where they are depreciated and functional with owners who do just enough to keep them running, and then on to the vintage/classic status where they have owners who are to varying extents emotionally tied to them, or possibly look at them as investments, and then take better care of them.

As far as the electronics, so far, except for temperature sensors and HES, there haven't been that many problems reported here. Jetronic, Motronic, Ignition controls, and ABS brains so far seem to be pretty rugged.

However, I recall from my industrial control days that the electronics used have time to failure curves where a long period of low failures is followed by a period where most of the failures occur and then the failure rate drops off again.  Sort of a bell curve.  I wonder when we hit that peak and how big it will be?


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

5Back to top Go down   Sprags and HES Empty Re: Sprags and HES Mon Feb 13, 2023 5:21 pm

moriarti

moriarti
Life time member
Life time member
Hopefully not your BIG BEN size more the normal BELL/END size Sprags and HES 44271 Sprags and HES 44271 Sprags and HES 44271


__________________________________________________
1984 k100 rs red/black VIN  0004449 Now sold to Olaf
    

6Back to top Go down   Sprags and HES Empty Re: Sprags and HES Tue Feb 14, 2023 2:00 am

jbt

jbt
Life time member
Life time member
According to me, it's less an improved quality of electronics or lubricants which explains this than the fact that the periodical and temporarly fashion for K vanished, and fewer people ride them...
But btw, I had to change HES on my K1 past year!


__________________________________________________
Let us enjoy the transient delight
That fills our fairest day.
    

7Back to top Go down   Sprags and HES Empty Re: Sprags and HES Tue Feb 14, 2023 3:41 am

robmack

robmack
Life time member
Life time member
You're correct about the failure curve for electronics.  There is a high rate of failure right at the beginning of the life of the device where early life failures occur.  Then the curve is low and flat throughout the expected life of the device, the MeanTime Between Failure number, and then a return to very high failure rates as the lifetime is reached or exceeded.  With 30+ year old electronics in these motorcycles, I'd expect to see a rise in the failure rate soon. I should think that electrolytic and tantalum capacitors would have caused havoc by now but that's not the case.   It is.a testament to the build quality that these complex electronic devices on the K-bikes.


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

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