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K100-forum.com » Technical, repair and troubleshooting » Electrical » ECU question

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1Back to top Go down   ECU question Empty ECU question Wed Jan 02, 2019 2:45 pm

yamaguzzi

yamaguzzi
Life time member
Life time 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   ECU question Empty Re: ECU question Wed Jan 02, 2019 2:55 pm

duck

duck
Life time member
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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
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
    

3Back to top Go down   ECU question Empty Re: ECU question Wed Jan 02, 2019 3:34 pm

92KK 84WW Olaf

avatar
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.


__________________________________________________
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 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 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
    

4Back to top Go down   ECU question Empty Re: ECU question Wed Jan 02, 2019 3:37 pm

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.
ECU question 610153



* 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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"A long ride is the answer to a question you will soon forget!" ~ Anonymous
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT
    

5Back to top Go down   ECU question Empty Re: ECU question Wed Jan 02, 2019 3:42 pm

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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"A long ride is the answer to a question you will soon forget!" ~ Anonymous
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT
    

6Back to top Go down   ECU question Empty Re: ECU question Wed Jan 02, 2019 5:54 pm

Suzi Q

Suzi Q
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....
ECU question 01511


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Sometimes I'm not really Suzi Quatro.
    

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

Rick G

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


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

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

Woodie

Woodie
Life time member
Life time 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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ECU question Logo2111
1985 K100RT  52667
1990 K75RT 6018570 (project)

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

9Back to top Go down   ECU question Empty Re: ECU question Thu Jan 03, 2019 5:41 am

Suzi Q

Suzi Q
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.)


__________________________________________________
Sometimes I'm not really Suzi Quatro.
    

10Back to top Go down   ECU question Empty Re: ECU question Thu Jan 03, 2019 9:09 am

yamaguzzi

yamaguzzi
Life time member
Life time 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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