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K100-forum.com » Technical, repair and troubleshooting » Electrical » Tachometer stops and loss of power

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1Back to top Go down   Tachometer stops and loss of power Empty Tachometer stops and loss of power Sun May 30, 2021 7:16 pm

Rod

Rod
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New member
I have a 1990 K1, where I might get an hour into a ride and the tacho drops to zero and I lose power.  Not enough to stop, but enough.  I was researching similar issues and found a Ducati with an intermittent electrical / grounding issue that meant that one cylinder lost power - the one connected to the tacho.  Has anyone seen this problem before?  Is it similar to the Ducati?  I have a manual, but reading the electrical diagrams is beyond me.  Would you know which cylinder to start with?

    

Arlina

Arlina
Moderator
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Got 2 coils, 1 is for cilinder 1 and 4, the other one is for cilinder 2 and 3.
Sounds like a fail on a coil when it gets hot, shit is over when it cools down.

Nice page to watch and about your coils (almost at the bottom of the page)
http://www.kforum-tech.com/electrical/EFI/bike-wont-start-EN.htm


Also check the earthlines, there is a thick wire on top of the gearbox directly to the battery, a bunch together under the tank, and ofcourse the lines to the coils.


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Tachometer stops and loss of power Eu-log10  K1100RS/LT - R1200RT - R1100RS - Cagiva SST 350 Ala Verde - K75LT project - K75 Schurgers - K75S - K1100RS - K75RT - K75C
    

Rod

Rod
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New member
Thanks very much for that - great help.

    

4Back to top Go down   Tachometer stops and loss of power Empty Buy coils Sun Jun 20, 2021 1:59 am

Rod

Rod
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New member
Any suggestions on where to buy replacement coils for a K1?  Bosch part number 0221500413.  I have had a look and there are some for K100 which are part number 12131459513, but the base looks different.  

    

Rick G

Rick G
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admin
Don't go throwing money at a problem until you know for sure where the problem is. The Hall sensors are a likely culprit along with the coils.
Go to the portal page and look for a guide on testing coils and sensors it could just save what hair you have left.


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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
    

92KK 84WW Olaf

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RicK G wrote:Don't go throwing money at a problem until you know for sure where the problem is. The Hall sensors are a likely culprit along with the coils.
Go to the portal page and look for a guide on testing coils and sensors it could just save what hair you have left.
Either Hall Sensor or a coil causes 2 cylinders to drop out.

The rev counter is attached to one of the coils.

Simple test is if you can by feeling the headers decide the 2 cylinders that die, its either 1/4 or 2/3, then change the coils over. They are interchangeable.

If the dud cylinders stay same, its Hall sensor, if dud cylinders change to follow the coil change, then its the coil is your problem.


__________________________________________________
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 49,200 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
    

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