K100RS Injection woes... or not? - K-Bikes.com - Excellence in Motion
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post #1 of 25 (permalink) Old Mar 8th, 2010, 4:28 am Thread Starter
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K100RS Injection woes... or not?

Hi guys, I bought a K100RS and drove it back from the dealer over 130miles and all was fine. The next day took it out didnt get more than 2 miles and it cut out. No chance of it starting. All lights worked, engine turned but would not even try to fire. Anyway left it over night is some nice old ladies garage, next day it started. But the promptly died. So I took out the plugs to check for a spark, all was good, but they were soaked in fuel. So it seems like the injection system is just chucking out fuel? Anyone has this issue before, is it a sensor or ecu issue? How can I check?

Thanks in advance
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post #2 of 25 (permalink) Old Mar 8th, 2010, 9:46 am
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All these big K's flood very easily unless you are used to them. The starting trick is NOT to open the throttle. If it doesn't fire after 3 cranks, leave it alone for 1/2 hour then try again. Once the plugs have been flooded they have to be dried out.

New to you bike, so you may have to start looking at things before being confident about doing a long ride. Has it been serviced and what was changed before you bought it? If you rode 2 miles and it cut out, that sounds like a fuel problem or electrics. Pity the dealer is so far away, I'd have had it back in their shop and insisted they did a computer diagnostics check.



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post #3 of 25 (permalink) Old Mar 8th, 2010, 10:54 am
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Fuel pressure regulator or stuck/defective TPS......but suspicious me, I would start looking back at anything the dealer may have worked on or....forgotten to work on!

But give some details here, year, milleage, previous symptoms, work done etc...etc....!

Benelli 50cc at 14
Yamaha RD 200 at 16
Yamaha RD 350 at 17
Honda CB 750 F at 18
Honda V45 Sabre at 24
BMW K100RS at 27
BMW R100GS at 34
BMW K1200RS at 53
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post #4 of 25 (permalink) Old Mar 9th, 2010, 3:34 am Thread Starter
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Hi guys thanks for the replies so far. Well I had the battery off last night to recharge it as I pretty much drained it when I broke down. Slapped it back on this morning, and oh-my-god. The thing nearly caugh fire on me. No idea what the hell happened. It started with me trying to fire it up but no joy, wouldnt even turn. Just sum wine and ticking from the battery area. So I though maybe I didnt make the contact good enough so I tightened it up and still no joy, but only this time smoke start coming from the battery area. It kept coming even after the ignition was off, so it was a scramble to get the thing disconnected.

I suspect when I pressed the ignition, for some reason the starter motor wouldn't turn causing the motor to draw too much current so the relay fused shut and kept the connection even with the ignition off.

After the smoke cleared it looks like no damage was done to the bike, all the heat was in the battery, so it's a new battery now and probably major electric issue due to this short. Hopefully the relay is easy to replace and the starter motor isn't totally fucked.

In terms of history, the bike had a major service 3000miles ago, with the ABS removed. No electrical work was carried out, apart from checking it was ok. I don't have the full details with me, but it included things like new fork seals, plugs, brake hose's, pads, oils and tyres.

What vex's me is I did 130 miles no worries, then the next day all Pete tong. Somone else suggested perhaps the injectors were stuck open?

Either way I gonna need a good parts place, apart from eBay where's good for cheap k100 bits?
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post #5 of 25 (permalink) Old Mar 9th, 2010, 11:50 am
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Yep, relays/starter/battery Ouch....but I think you are heading the right way!

Parts:
New, and easy to use parts fiche:
http://www.maxbmwmotorcycles.com/fiche/fiche.aspx

Used:
http://www.beemerboneyard.com/
http://www.duncansbeemers.com/bikes/index.html
http://www.re-psycle.com/
http://www.cyclesrecycled.com/

And I came across this just yesterday.

http://losangeles.craigslist.org/lac...631444617.html

But can I suggest some way to quick disconnect your battery when further testing, like Vise-grips on a terminal and.....a large fire extinguisher!

Benelli 50cc at 14
Yamaha RD 200 at 16
Yamaha RD 350 at 17
Honda CB 750 F at 18
Honda V45 Sabre at 24
BMW K100RS at 27
BMW R100GS at 34
BMW K1200RS at 53
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post #6 of 25 (permalink) Old Mar 9th, 2010, 12:08 pm
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Methinks there may be TWO ground terminals on the battery. I'm only familiar with the K12 and there are 2 ground wires. Read on if you think the K100 is the same:

One is the frame ground to take mucho amps starter current, the other is the loom ground which can also try to take mucho amps when somebody has added extras and used the frame as a ground. When you lift the battery, this lead can drop behind the case so you can't see it when you replace the battery.

The bad news is, leaving the frame ground off the battery and starting gives you a slow crank (BIG WARNING, something wrong), but whilst this is happening, the loom is smoking itself to death.



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post #7 of 25 (permalink) Old Mar 9th, 2010, 1:57 pm Thread Starter
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@H96669 - Thanks for the links
@Voxmagna - Not sure, can only see one ground, but gonna prob get the tank soon and see what about.

Well tonight I removed the starter motor cleaned it and managed to open the starter relay using a hammer!

As I fried the original battery I borrowed the battery off my Guzzi and yay the bike fired into life.

I hardly used any choke this time infact a small blip of the throttle and it fired from cold. Kept it going for a couple of mins on the throttle and then it was warm enough to idle. After about 5 min of idle it promptly cut out. This time I noticed it struggling for a minute before it cut, the exhaust smelt very rich and it got lumpier then died.

So i'm now starting to wonder if somthing happens when the engine gets to temperature, maybe the heat is affecting the injectors or some sensor? I heard this can happen but I can't find the reference on the net.

Does this sound familier now? Or am I thinking on the wrong lines.

Last edited by jwab; Mar 9th, 2010 at 2:03 pm.
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post #8 of 25 (permalink) Old Mar 9th, 2010, 3:14 pm
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Quote:
Originally Posted by jwab
@So i'm now starting to wonder if somthing happens when the engine gets to temperature, maybe the heat is affecting the injectors or some sensor? I heard this can happen but I can't find the reference on the net.

Does this sound familier now? Or am I thinking on the wrong lines.
Familiar yep....the O2 Sensor.And depending on years, Intake Air Temperature Sensor, Engine Temperature Sensor, those are connected to the brain to vary the Fuel/Air mixture depending on conditions.

Someone else is having symptoms like that.....But it has been a while since I worked on one of them, do they need a TPS reset after taking the battery out ? Can't hurt anyway: Ignition ON, Engine Off, Crank and release the throttle 4 times,Ignition Off, that's it, at least on my bike, may be different on yours.

But check this one here, may give you some ideas.

http://www.k-bikes.com/forums/showthread.php?t=21084

But you are right, very little on the net on that...

And.....what kind of Guzzi?

Benelli 50cc at 14
Yamaha RD 200 at 16
Yamaha RD 350 at 17
Honda CB 750 F at 18
Honda V45 Sabre at 24
BMW K100RS at 27
BMW R100GS at 34
BMW K1200RS at 53

Last edited by H96669; Mar 9th, 2010 at 3:26 pm.
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post #9 of 25 (permalink) Old Mar 12th, 2010, 6:24 am Thread Starter
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Well I've had an intersting conversation with a person from Sherlocks of devon BMW specialist and they said the 8v K100 doesn't even have a O2/Lambda sensor. They suggested that it could be the fuel pressure regulator.

Anyways I'm gonna get it off this weekend to take a gander and see what stuff it does have.

Oh and the Guzzi is a T3
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post #10 of 25 (permalink) Old Mar 12th, 2010, 9:50 am
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Interesting because the "Cat" was an option in Canada in the early 90's, not a popular one at that, but the MaxBMW parts fiche seems to list them on all the bikes. So no Cat, no O2 sensor. I just went through that for a different reason and had to look back at some of the original equipment lists I have here. But fill me in a bit, what year is your bike?

A T3, nice....old's cool, I should have bought that Eldorado years ago, was cheap too!

Benelli 50cc at 14
Yamaha RD 200 at 16
Yamaha RD 350 at 17
Honda CB 750 F at 18
Honda V45 Sabre at 24
BMW K100RS at 27
BMW R100GS at 34
BMW K1200RS at 53
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