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K100-forum.com » Technical, repair and troubleshooting » Bike Stopped Now Will Not Start

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1Back to top Go down   Bike Stopped Now Will Not Start Empty Bike Stopped Now Will Not Start Mon Jul 27, 2015 7:01 am

bettyswolloks

bettyswolloks
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Riding to work this morning, bike cut out, I think I felt a little clunk round by my right foot. While sat at the roadside I noticed the ignition lights going a little dimmer, like the lights where being switched on and off, also the fuel pump sorta pulsed a few times. All I've managed to do is check the fuse's, all fine. The bike lights up like all is well, it just keeps on turning over, the battery has plenty of charge in it.
Up until this point the bike has been faultless, typically I just put my last £20 in the tank and had to borrow the bus fare till payday, thankfully that's on Friday!

http://ranfog.co.uk
    

2Back to top Go down   Bike Stopped Now Will Not Start Empty Re: Bike Stopped Now Will Not Start Mon Jul 27, 2015 7:30 am

92KK 84WW Olaf

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Check the electrical connection to the fuel tank. Your post doesn't state the year but the early 1984 fuel tank connection is front left, later ones are rear right. The pins can cause problems resulting in no fuel....You can prise the pins open a little and make it a tight connection.

Unless it was diesel you put in......


__________________________________________________
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
    

3Back to top Go down   Bike Stopped Now Will Not Start Empty Re: Bike Stopped Now Will Not Start Mon Jul 27, 2015 1:04 pm

bettyswolloks

bettyswolloks
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Been up to it with some spanners, there is a healthy spark. Fuel to the fuel rail but nothing to the plugs. I'll have a look at the connection you mention. Its a 1990.

http://ranfog.co.uk
    

4Back to top Go down   Bike Stopped Now Will Not Start Empty Re: Bike Stopped Now Will Not Start Mon Jul 27, 2015 2:05 pm

duck

duck
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Fuel level sender connector is a good place to start.

Another potential cause of instant cutout is a flaky ignition switch.

If it only does it once warmed up then Hall Effect Sensor is a likely cause.


__________________________________________________
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
    

5Back to top Go down   Bike Stopped Now Will Not Start Empty Re: Bike Stopped Now Will Not Start Sun Aug 02, 2015 1:07 pm

bettyswolloks

bettyswolloks
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Hello All. After a little more delving....
Its getting fuel, the injectors are working fine.
Its only sparking on the outer 2 pots, they are fed by the same coil. The other coil isn't getting any juice to it, swapping the wiring around, swapping the feeds transfers the fault, so the coil is working fine. Following the brown/black wire, it might be purple/black, anyway following it back to the cdi and beep testing it shows the wire is intact, pointing to a fault in the cdi unit itself....
...Doesn't it?

Any more ideas folks?

http://ranfog.co.uk
    

6Back to top Go down   Bike Stopped Now Will Not Start Empty Re: Bike Stopped Now Will Not Start Sun Aug 02, 2015 8:22 pm

Rick G

Rick G
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From your description it would almost have to be the wiring between the coils and ICU or the ICU itself. Check the wiring first because the 2-3 firing is what triggers the ECU to fire the injectors so far more likely to be the wiring.
Does the tacho work it works off the same trigger.


__________________________________________________
"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   Bike Stopped Now Will Not Start Empty Re: Bike Stopped Now Will Not Start Sun Aug 02, 2015 10:43 pm

Holister

Holister
Life time member
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Poor connections at the ICU due to plug not properly seated or corrosion??? Pretty common. Try some Deoxit and make sure it's seated properly. The ICU is a reasonably reliable unit so if its not the plug connection I'd start looking at the other side of the ICU first. One of the hall sensors could be dud or more likely you've got a poor connection at the HES connector (under the tank, R/H side). See Bert's diagrams on the troubleshooting page. All the pin-outs for the plugs are there.


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808		 Bike Stopped Now Will Not Start Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

8Back to top Go down   Bike Stopped Now Will Not Start Empty Re: Bike Stopped Now Will Not Start Sun Aug 02, 2015 11:12 pm

Rick G

Rick G
admin
admin
It's not a hall sensor because the injectors are firing and they trigger from 2-3 hall sensor


__________________________________________________
"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
    

9Back to top Go down   Bike Stopped Now Will Not Start Empty Re: Bike Stopped Now Will Not Start Mon Aug 03, 2015 1:29 am

Holister

Holister
Life time member
Life time member
That's correct Rick but as far as I know the Jetronic does receive signals from both sensors on pin 4 via the ICU. It then divides the frequency to get 2 injection pulses per cycle (720°).
My feeling is that its an arbitary process, as all the signals come to the FICU on one wire, there's nothing to say which signal is from what sensor. Just my thoughts.


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808		 Bike Stopped Now Will Not Start Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

10Back to top Go down   Bike Stopped Now Will Not Start Empty Re: Bike Stopped Now Will Not Start Mon Aug 03, 2015 3:02 pm

bettyswolloks

bettyswolloks
active member
active member
Thanx everyone, its all giving me a little glimmer of hope! The troubleshooting guide is printed off and will be with me next time I get to the unit to have another go at it, tomorrow hopefully.
My Mate has had a go at it and he checked all the connections under the tank and all looked good.
Keep the ideas coming, I cant afford/stomach another week on the bus to work!!

http://ranfog.co.uk
    

11Back to top Go down   Bike Stopped Now Will Not Start Empty Re: Bike Stopped Now Will Not Start Mon Sep 21, 2015 4:00 pm

bettyswolloks

bettyswolloks
active member
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Well finally got it running again, replaced the hall sensors and it fired straight up, much to the delight of its new owner.

http://ranfog.co.uk
    

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