BMW K bikes (Bricks)

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JonnyHonda

JonnyHonda
active member
active member
So I bought a K100 blind on eBay, (everyone stop laughing). I knew there was a starting issue when I bought it. ( no seriously, stop laughing)

I'm working my way through crazy frogs trouble shooting guide and I have to say it's a cracking guide.

Anyway, fuel pump runs on quick press of the starter, I've had the injector rail off and the injectors spray fuel and cut off when the starter is pressed and released.

I was checking the values for the air flow thing and was getting an open circuit so I've removed it and checked the values on its pins and the readings are OK
Pins 5-7 = 93 ohms
Pins 7-8 = 352 ohms
Pins 8-5 = 362 ohms
Pins 8-9 = 209 ohms

So I'm now going to check the continuity of the cable and then refit the unit and test again.
I'll let you know how I get on.

    

Comberjohn

Comberjohn
Life time member
Life time member
Welcome to the forum, Jonny.
The doctor(s) need more information about the symptoms.
There's nothing more the old gits on this forum enjoy than a good problem.
So I'll start. Does it start at all or never has started since in your tender mercies? 😕


__________________________________________________
Life is not a rehearsal.
2010 VFR 1200F DCT 
2010 R1200GS(gone)
1986 K100 Silver(gone)
2012 K1600GT(gone)
1984 K100RT Madison Silver(gone)
1989 K100LT Stratus Grey(gone)
1984 K100 Red(gone)
http://www.johnsdrivingschool.co
    

JonnyHonda

JonnyHonda
active member
active member
Thanks ComberJohn,

It was running for the previous owner, but it gave out on him on the motorway, after some tinkering he gave up and I bought it, this was about a month ago, but no I've never actually seen it move under it own steam.

I've only just got round to having a play, I have tried to start it and it did fire and semi-ran while the starter motor was running but died when the throttle was revved, so I figured sensor of some kind, so I'm in the process of going round bike testing everything that I can find.

Oh, and there is fuel leaking from exhaust joint and I have had the plugs out and there is a spark there.

    

Inge K.

Inge K.
VIP
VIP
@JonnyHonda wrote:Oh, and there is fuel leaking from exhaust joint and I have had the plugs out and there is a spark there.
Sounds like it getting to much fuel, unless you have been doing starting attempts all day.

First the plugs is wet fouled, and need to be dried.
Second I would have checked the temp sensor.

Measure the resistance between contact #10 and 13 at the injection ECU connector
(female side).
Count from the rear end, also the empty slots.
In the troubleshooting guide at the portal you find a table, resistance vs. temperature.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

JonnyHonda

JonnyHonda
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Thanks Inge K. I'll do that tonight and post my findings as soon as I can


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Regards and Ride Safe
    

JonnyHonda

JonnyHonda
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active member
So I've checked the continuity of the airflow unit and its fine, I was just counting the pins wrong. Cleaned plugs and tested the water sender. 

The water temp send gives a reading of about 3.1k which on the graph I think is around 16°c which would be about right.

On speaking to the PO he says his troubles started after he fitted an extra set of rear lights that look as if they were spliced directly into the rear light wiring, could this have fried something? Or do I need to start swapping out computers?

This is fun... Shocked

Incidentally I notice the fuel warning lights aren't on, what is the limits on these as I know the level is very low and I would expect at least one to be on?


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Regards and Ride Safe
    

7Back to top Go down   An investigation into Starting problems Empty A life lesson coming up... Fri Oct 10, 2014 1:46 pm

JonnyHonda

JonnyHonda
active member
active member
Well been testing checking and tinkering with no joy-joys, so while bored at work I traweled eBay for an EFI unit, I thought I have to start somewhere. Found one ordered it, comes Wednesday.

Anyway, thought I'd have another tinker tonight while wifey is at work, tank off and I spy a stray brown wire. Yep a ground wire, looks like it enters the loom and heads north to the ignition unit.

New connector fitted tank on, starts first time.

Life Lesson? Check twice, check again,  Sods law says you've missed something simple.

So starts runs rough, wavey tacho needle and and won't idle, but they are problems for another day.

Thanks everyone.


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Regards and Ride Safe
    

92KK 84WW Olaf

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Life time member
Life time member
I have seen a few Ks do that now and the key is one earth for starter sequence and a second earth for running. If the second one is faulty then it dies as soon as you take your finger off the button.

You did right to check that earth, also one that can do it is the connection under the seat, the one to the computer. If the connection is dodgy you can get same thing. Taking battery out or even disconnecting a terminal could disturb that and the PO may have done that when he was altering the rear lights.


__________________________________________________
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 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 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
    

Crazy Frog

Crazy Frog
admin
admin
@JonnyHonda wrote:I'm working my way through crazy frogs trouble shooting guide and I have to say it's a cracking guide.
welcome to the forum Jonny Honda.

Winter is coming and you never know what I will do.
Maybe writing another document on a specific repair??? Time will tell

Glad that you were able to fire your engine up. That's a reward for your hard work.

CF


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An investigation into Starting problems Frog15An investigation into Starting problems Logo2101986 k75, 1985 K100rt, 1985 K100rt/EML GT2 sidecar, 1999 K1200lt/Hannigan Astro Sport sidecar.
    

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