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1Back to top Go down   low speed cutting out. Empty low speed cutting out. Thu 06 Jul 2017, 04:13

bigdavergs

bigdavergs
Silver member
Silver member
Hi all, a little bit of help needed please. Low speed cylinders cutting out on my '85 k100 (naked with an RS fairing). Checked the past topics, the culprit seemed to be the coil as the problem is the engine would only run on two cylinders and the tacho would stop working, then the two cylinders would fire up, as would the tacho. Checked the coils, they were the older, original type still. Bought some newer type as the topic suggested with the orange bits on them, fitted them yesterday, cutting out problem persists. My commute to work is about 5 minutes of town speed, 20 minutes at 100kph speed, so the twin cylinder problem is not a problem for long and once at speed, the bike runs well. Other work to the bike includes, new plugs, ignition switch taken apart and cleaned (looked brand new still) and EME plug leads were fitted last year. This problem has only started about three weeks ago.
Any other suggestions to sort out the problem would be most appreciated. Many thanks, Dave.

    

2Back to top Go down   low speed cutting out. Empty Re: low speed cutting out. Thu 06 Jul 2017, 19:51

Holister

Holister
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Life time member
A bit confused. Is it running ok then cuts out or is just not starting nor running on 2.
"Cutting out" implies its going ok then stops.

Try these

  • Check your spade connectors on the bottom of the coils particularly the earth connections.
  • Make sure the ICU plug is clean and properly seated. This is a common problem.
  • Make sure the HES connector plug front/right under the tank is clean and properly seated.
  • One of your HES may be Kaput.


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
 low speed cutting out. Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

3Back to top Go down   low speed cutting out. Empty Re: low speed cutting out. Fri 07 Jul 2017, 00:36

bigdavergs

bigdavergs
Silver member
Silver member
Hi Holister, thanks for the reply. I'll try to be a little clearer. Bike starts and idles fine, as soon as I pull away it intermittently runs on two cylinders and the tacho stops working. Once out onto the open road, it's fine. When I get to the town where I work, it will often drop two cylinders and the tacho stops working again. As mentioned, I replaced the original coils a couple of days ago with a pair of the orange tower coils to try and fix the problem, but the problem persists. So, the issue happens hot or cold. Any more thoughts from anyone? Cheers, Dave.

    

4Back to top Go down   low speed cutting out. Empty Re: low speed cutting out. Fri 07 Jul 2017, 00:45

92KK 84WW Olaf

avatar
Life time member
Life time member
Have you any way of determining which two cylinders are causing the trouble? The tacho signal comes from one of the coils and both coils get their signal starting from the Hall Effect Sensor.

If one of the sensors is acting up it will interfere with the signal for either 1&4 or 2&3 and will affect two rather than one cylinder.

I cant remember if its 2/3 coil has the tacho signal but its pointing to one of the sensors or to damage to the wire from the HES to the ICU.

Check and clean plug and pins on ICU. Can you swap the HES with another?

Still points to Holister's post.


__________________________________________________
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
    

5Back to top Go down   low speed cutting out. Empty Re: low speed cutting out. Fri 07 Jul 2017, 02:49

duck

duck
Life time member
Life time member
FYI: There's two black/blue wires from the 1&4 coil. One goes to the tach and the other comes from the ICU.

If the tach goes out when you're running on 2 cylinders then I'd guess it's the 1&4 coil not firing.

One of the following may be the culprit:
1 - ICU going bad or connector loose
2 - One of the HES sensors or its wiring going bad.

The HES wiring is zip-tied to the right frame member that goes to the engine.  You can try wiggling that to see if the HES wiring might be the issue.


__________________________________________________
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
    

6Back to top Go down   low speed cutting out. Empty Re: low speed cutting out. Fri 07 Jul 2017, 04:33

Rick G

Rick G
admin
admin
If your 2-3 goes out the engine stops because the ECU gets it's signal to fire the injectors from that so the 1-4 coil/HES is where I would be looking for starters.


__________________________________________________
"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
    

7Back to top Go down   low speed cutting out. Empty Re: low speed cutting out. Fri 07 Jul 2017, 05:58

bigdavergs

bigdavergs
Silver member
Silver member
Many thanks Olaf, Rick and Duck for the excellent info'. Gives me something to work with and I've got plenty of spares, so we'll see how we go. Thanks again, Dave.

    

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