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Rolfieh
Joined: 14 Apr 2008 Posts: 11
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Posted: Tue Apr 15, 2008 2:37 am Post subject: Probelms on day two of ownership - K1100RS |
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I have just bought a 1993 K1100RS (about 40k miles) as the price was good and the person I bought if from I have know for about twnety years and he owned it from new. Rode it home okay and to work yesterday (Monday). We had a few rain showers yesterday, oone just before I left to go home. When I started the bike it was rough running and felt like it was running intermitently on 3 cyclinders all the way home (surging). My journey is 24 miles home mostly on motorway so it got up to a good temperature. My starting point will be the Spark Plugs. HT Leads (are they really £20 each!!!!) and Coils as I suspect water ingress as the most likely cause but would have thought that this would have clear as the bike s temperature increased. The bike itself has probably not been ridden much over the last year. Is there any other things that I sould particularly look for on this bike that might be causing a problem? |
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Shoganai Biscuit Fluffer
Joined: 27 Apr 2005 Posts: 2234 Location: Culpeper,VA
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Posted: Tue Apr 15, 2008 3:25 am Post subject: |
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First, let me welcome you to this cool K1100 site.
Ok, I have some questions…
1. Does the exhaust smoke, if so what color is it?
2. Was there any difference in the way it ran hot or cold? If so what?
3. Was there a difference in the freq. or force of surging noted between decelerating and accelerating?
4. Did it back fire?
Other things to look at;
You should get the Motronic codes read at a dealer to start with, but just off the top of my head…
O2 sensor
Spark plug wires
Water in fuel
Air filter
Fuel filter
Electrical shorts
Cracked exhaust header - leading to bad O2 sensor readings
Cracks in the intake manifold
Good luck! When mine was doing this, it took lots and lots of money and lots of part were replaced in the process.
I'm not the best to answer your question, but there are other here with AWSOME experience and unmatched knowledge about old k-bikes. Stick around and I'm sure you'll get what you need to solve your problem. And please give us feed back so we can all learn from your bike issue.
_________________ 1993 K1100RS aka The Shop Whore
1994 K1100RS aka Blue Streak
The long road is a rainbow and the pot of gold lies there.
So slip the chain and I'm off again,
You'll find me everywhere. I'm a Rover. - JT
Nana korobi ya oki |
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max Flying Brick Rider
Joined: 22 Aug 2005 Posts: 309 Location: NZ
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Posted: Tue Apr 15, 2008 5:36 am Post subject: |
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Remember too that the coils run as "wasted spark", so having a dud lead can affect two cylinders, not just one...
Other things you might want to think of checking
- battery condition (remember you could start and run, but a battery that doesn't charge will leave the alternator running the ignition at idle, when the voltage is dropping)
- ignition amplifier/driver (on the front of the battery carrier) - drtiy contact here can affect coil function too, possibility of overheating apparently too? (don't have one here, mine is a 96 with the later version Motronic setup)
Cheers
Max |
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Scott_Anderson Site Admin
Joined: 05 Sep 2006 Posts: 3117 Location: Central Iowa, USA
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Posted: Tue Apr 15, 2008 7:05 am Post subject: |
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I had some rough running last year for a while. I used some F.I. cleaner in the fuel, which made a big difference. I also replaced the plugs anyway because they were inexpensive.
I probably need to get some more F.I. cleaner for this year. (usually 1 per year in the spring).
Ride Safe
Scott |
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Stoked Steve Flying Brick Rider
Joined: 01 Sep 2004 Posts: 1402 Location: Virginia Beach, VA
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Posted: Tue Apr 15, 2008 7:57 am Post subject: |
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One other odd thing to check on a '93 is something called the ignition amplifier module (I think). It is down by where your left foot would be while riding. The wire that connects to that was loose on mine and caused an intermittant mis-firing as you describe. I spent a lot of time trying everything else before I realized this vital connection was loose.
If not the connection, it could also be the module.
Apparently it's something the '93's carried over from the K100, but later years changed this arrangement.
Good luck! _________________ Steve
Virginia Beach, VA
93 K1100RS Mystic Red SOLD
12 Suzuki DL650A VStrom |
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BMGraeme Flying Brick Rider
Joined: 14 Mar 2006 Posts: 373 Location: Marlborough, United Kingdom
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Posted: Tue Apr 15, 2008 12:03 pm Post subject: |
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Before you try anythinb else just check the plug caps are fitted on the sparkplug tightly. They can be very stiff to get off and logic dictates they are stiff to get on. I always grip the metal tag with a pair of pliers to get them off and when reconnecting they get a wack with a rubber mallet. Quite often I can "feel" them reseat correctly after this treatment.
How did I know this - I had the same problem you're having. _________________ 1980 CB900FA
1994 K1100RS
2008 R1200GSA |
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Ted Site Admin
Joined: 03 Apr 2003 Posts: 1117 Location: Further
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Posted: Tue Apr 15, 2008 4:32 pm Post subject: |
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Quote: | The bike itself has probably not been ridden much over the last year. |
Fuel filter?
Should probably be replaced anyway _________________ Ted
KOG#1 |
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Tim (Midland Section) Flying Brick Rider
Joined: 08 Apr 2005 Posts: 960 Location: Pinxton, Nottingham, England.
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Posted: Tue Apr 15, 2008 4:37 pm Post subject: |
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BMGraeme wrote: | Before you try anything else just check the plug caps are fitted on the sparkplug tightly. They can be very stiff to get off and logic dictates they are stiff to get on. I always grip the metal tag with a pair of pliers to get them off and when reconnecting they get a wack with a rubber mallet. Quite often I can "feel" them reseat correctly after this treatment.
How did I know this - I had the same problem you're having. |
I did just that on my first K11, changed the plugs just before we set off for the National rally, It missed & f*rted all the way there, watching the fireworks whilst running in the dark showed me my error. Suggest you do the same.
HTH. _________________ Regards Tim,
Grey haired riders don't get that way by pure luck
1996 Guzzi Cali3 LAPD
1972 750 Commando
G6HRN
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Rolfieh
Joined: 14 Apr 2008 Posts: 11
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Posted: Tue Apr 22, 2008 2:28 am Post subject: |
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Problem solved. Removed the lower fairing and two of the plug caps almost fell off. I think previous owner must have messed with tghe spark plugs and failed to put the plug caps back on correctly. Running fine now but very buzzy. I think a full service is in order. _________________ Rolfieh
1993 K1100RS |
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Stoked Steve Flying Brick Rider
Joined: 01 Sep 2004 Posts: 1402 Location: Virginia Beach, VA
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Posted: Wed Apr 23, 2008 7:18 am Post subject: |
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Always a happy day when it's something simple and cost free! _________________ Steve
Virginia Beach, VA
93 K1100RS Mystic Red SOLD
12 Suzuki DL650A VStrom |
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