BMW K bikes (Bricks)

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1Back to top Go down    ECU question on Wed Jan 02, 2019 10:45 am

yamaguzzi

yamaguzzi
Silver member
Silver member
will the ECU from a 1991 K100RS work in a 1988 K100RS ? I found one locally for cheap and if it will be a direct replacement I'd like to get it as a spare for when I travel


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1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://motoguzzi850t.blogspot.com/
    

2Back to top Go down    Re: ECU question on Wed Jan 02, 2019 10:55 am

duck

duck
Life time member
Life time member
No, not even close.

The 91 K100RS is a 4 valve engine that uses a Motronic while an 88 RS is a 2 valve engine that uses an L-Jetronic.

ETA: And there's no need to even have a backup at home for the L-Jetronic of your 88, much less carry with you. The failure rate of them is extremely low. Most of the failures I've heard of are bikes that sit forever and the cause of failure is ants, spiders or other critters making a home in them.


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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
    

3Back to top Go down    Re: ECU question on Wed Jan 02, 2019 11:34 am

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
Even though I have a spare likewise its never the unit to go but improper electrical connections or loose plug. I just swap them out from time to time and clean the pins at my leisure leaving it in the shed for future use.

16v one won't work for a 2 v engine, also a K75 and K100 are not interchangeable either.


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1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 90,575 miles
1983 K100RS 0011175 Fricka 29,000 miles Damn K Pox
    

4Back to top Go down    Re: ECU question on Wed Jan 02, 2019 11:37 am

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Welding on center stands* while both negative and positive connections are active is also not recommended for the general good health of the ECU.




* My mate Rocket Dog's '85 K100RT had a cracked stand, itself a very high failure rate. His mechanic fired up the welder and did the dirty deed. He bought him a used $300 ECU from the local dealer to get home to New Jersey. Lesson learnt.


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1987 K100RS, '89 K100 w/K1100RS engine, '93 Framed K11/K12 engine 'Big Block', '09 K1300GT, '07 K1200R, '95 R100 Mystic & '77 R75/7.

    

5Back to top Go down    Re: ECU question on Wed Jan 02, 2019 11:42 am

Two Wheels Better

Two Wheels Better
Moderator
Moderator
@yamaguzzi wrote:will the ECU from a 1991 K100RS work in a 1988 K100RS ? I found one locally for cheap and if it will be a direct replacement I'd like to get it as a spare for when I travel
When I need to sort out part compatability I go to www.realoem com/BMW and enter the last 7 digits of my VIN. From there I search the sub-sections of ETK via the images until I locate the specific part number. Highlighted in blue it is easy to click on the number to see whether it's also in other K bike (or even R bike) catalogues. Opening one or two of those other catalogues helps to confirm it is correct and interchangeable between machines.


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1987 K100RS, '89 K100 w/K1100RS engine, '93 Framed K11/K12 engine 'Big Block', '09 K1300GT, '07 K1200R, '95 R100 Mystic & '77 R75/7.

    

6Back to top Go down    Re: ECU question on Wed Jan 02, 2019 1:54 pm

chris846

chris846
Life time member
Life time member
In case anyone has concerns about the K ECU cojones, this thing hit a tree - the ECU somehow had its casing knocked clean off (the PCB you can see is its innards - still connected)
I repaired and refitted the casing, the thing is still working without a glitch 4 years later....


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The Longest Lunch
    

7Back to top Go down    Re: ECU question on Wed Jan 02, 2019 3:57 pm

RicK G

RicK G
VIP
VIP
The only thing I have seen that causes failure is a pressure cleaner and water ingress.


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

8Back to top Go down    Re: ECU question on Wed Jan 02, 2019 4:06 pm

Woodie

Woodie
Platinum member
Platinum member
Chris that is the most original photo of a cafe racer I have seen to date - LOVE IT! Is it being moved to the compost bins in the background? Shame....


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1985 K100RT
52667
"Keep your stick on the ice. We're all in this together." Red Green
    

9Back to top Go down    Re: ECU question on Thu Jan 03, 2019 1:41 am

chris846

chris846
Life time member
Life time member
"Is it being moved to the compost bins in the background? Shame...."

Nah, just polished the scratches out.

(My avatar is a selfie of the moment when I took the bandages off after that particular trip into the scenery.)


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The Longest Lunch
    

10Back to top Go down    Re: ECU question on Thu Jan 03, 2019 5:09 am

yamaguzzi

yamaguzzi
Silver member
Silver member
Thanks for the info I won't bother to waste the 50 bucks the guy wanted for it . It won't work anyway so I can't use it and I 'll stop looking for a spare if you all say this part is that good unless I can get the right one for 20 dollars.


__________________________________________________
1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://motoguzzi850t.blogspot.com/
    

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