BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


1Back to top Go down   Here we go again ... (starting issue) Empty Here we go again ... (starting issue) on Wed Jun 03, 2015 6:07 pm

K100Sprint

K100Sprint
active member
active member
Been a while since I have been on the forum. After getting the bike sorted out last fall, I had been riding it here in the Upstate region of South Carolina where I relocated for the past 6 months or so without an issue.

The other day I parked it in the garage and plugged in the battery tender jr. (as it was going to be a few days until I rode). I went to go to work a few days later and turned the key, but nothing when I hit the start button. When I flipped the kill switch in either direction, the bike emitted a buzzing/humming sound from under the tank/seat area ... in the relay box.

I didn't have time to do anything other than grab the truck and head to work, so there it sat for another day or so. On Saturday, somehow, somewhere, I lost my only key. Here we go again ... (starting issue) 61740  No way of getting another made, and the barrel and key assembly isn't available from BMW any longer. I figured I would just remove the lock section and look for something on eBay, no big whoop.

So, today, I FINALLY had a day off and got into it. I pulled apart the ignition lock and within several minutes, was able to turn the switch with a screwdriver. Now for the testing. Same exact result as before when I tried. No start, no sound when ignition is on and kill switch is in center position. Flip kill switch to either side, buzzing from relays. So, I decided to siphon the tank, remove it, and open up the relay box to get a closer look-see/listen. The sound is coming from the load-shed relay I think. I didn't hear the fuel pump engaging before I removed the tank, and now I am at the head-scratching phase.

Care to weigh in?


__________________________________________________
May the road rise to meet you ... and may gas prices drop substantially.

1985 K100 w/ Sprint fairing
Member BMWMOA #64178
Member GNBMWR #118
    

2Back to top Go down   Here we go again ... (starting issue) Empty Re: Here we go again ... (starting issue) on Wed Jun 03, 2015 6:24 pm

Comberjohn

Comberjohn
Life time member
Life time member
There's plenty of others who love a good electrical problem. Keeps them going for days. Rolling Eyes
My limited knowledge would say that you shouldn't hear anything when you switch the ignition on.
The pump only whirs when you hit the starter and stops a couple of seconds after you release the button, that's if it doesn't start.
If it starts, the pump continues to run.
Your problem is one I haven't heard of before but that will give some of them a challenge.


__________________________________________________
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
    

3Back to top Go down   Here we go again ... (starting issue) Empty Re: Here we go again ... (starting issue) on Thu Jun 04, 2015 10:47 am

Holister

Holister
Life time member
Life time member
If you suspect the LSR then try swapping it with the horn relay. They're the same. Both are in the front/right corner.


__________________________________________________

1989 K100RT     VIN No.  0097367 (naked)  
1996 K1100RS   VIN No.  0451808
  Here we go again ... (starting issue) Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

4Back to top Go down   Here we go again ... (starting issue) Empty Re: Here we go again ... (starting issue) on Sun Jun 07, 2015 7:07 pm

K100Sprint

K100Sprint
active member
active member
Swapped the relays and still the same result. I guess I am going to have to pull the starter and try that. But, no more time today, and 4am comes awfully early! Biggest drag is that I have missed some great riding weather over the past 10 days or so ... Evil or Very Mad

Oh well, I guess that is the price for having a 30 year-old bike. Maybe it's time for a 'Busa ...


__________________________________________________
May the road rise to meet you ... and may gas prices drop substantially.

1985 K100 w/ Sprint fairing
Member BMWMOA #64178
Member GNBMWR #118
    

5Back to top Go down   Here we go again ... (starting issue) Empty Re: Here we go again ... (starting issue) on Mon Jun 08, 2015 12:36 am

Holister

Holister
Life time member
Life time member
Have look at the troubleshooting page off the Portal Tab.

No sound from fuel pump/relay or the starter relay would indicate a power problem somewhere.

What voltage is your battery reading? The fact that its been on a trickle charger doen't guarrantee a good battery.
Are all the fuses ok?

You could test the start/kill switch functions with a meter first.
Sounds a bit sus. :suspect:  It may just need a good clean and deoxit.

Also worth checking that the connectors for the FICU (under seat) and the ICU (under tank) are clean and secure. Wouldn't be the first time either of these have been the culprit.

Could also be an earth connection problem. They need to be kept corrosion free. Gear box, under tank and starter.

I don't think the starter is your problem tho as you also aren't getting fuel pump.


__________________________________________________

1989 K100RT     VIN No.  0097367 (naked)  
1996 K1100RS   VIN No.  0451808
  Here we go again ... (starting issue) Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

6Back to top Go down   Here we go again ... (starting issue) Empty Re: Here we go again ... (starting issue) on Mon Jun 08, 2015 5:56 pm

K100Sprint

K100Sprint
active member
active member
Here we go again ... (starting issue) Wishin10Big fun with a small toolkit. Removed the ignition switch, tank, compute, battery, and (eventually) the starter. There was some corrosion on the positive terminal of the starter connection, but I figured why not remove the whole thing and clean it up. The rubber counterweights were kinda gummy, so mayhaps I need a new set of those too while I am in there?


__________________________________________________
May the road rise to meet you ... and may gas prices drop substantially.

1985 K100 w/ Sprint fairing
Member BMWMOA #64178
Member GNBMWR #118
    

7Back to top Go down   Here we go again ... (starting issue) Empty Re: Here we go again ... (starting issue) on Mon Jun 08, 2015 10:05 pm

Holister

Holister
Life time member
Life time member
go easy pulling things apart. You need to start with simple 'likely' things first. More often than not you'll find its just a loose/corroded connection. Also you may not then know what the fix was when you put it all back together.

Really important is to find out the condition of your battery. Buy a cheap ($10) digital multi meter (DMM). All sorts of weird and strange things can happen when your battery gets low. You said its been charged but that's no guarantee its good.

Cleaning earth contacts, start/kill sw. and ignition sw. would be next, or at least testing those switches with a meter first.
If its not the battery, my next guess would be the start/kill sw.

The 'monkey nuts' (rubber counter weights) are cheap enough to replace if needed, but what you've removed is the alternator. The starter is on the left. Check brushes for wear. Specs are in the manual. Worn starter brushes can cause strange problems.

Not a lot to do to the alternator unless you pull it apart and refurbish it and there is nothing to suggest you need do this so leave it alone. Just check the brushes and clean the contact on the voltage regulator. Worn brushes here or dud voltage regulator will result in poor charge voltage while running. Make sure you replace the alternator connector before starting the engine


__________________________________________________

1989 K100RT     VIN No.  0097367 (naked)  
1996 K1100RS   VIN No.  0451808
  Here we go again ... (starting issue) Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum