K11 Owners Group

sh00ter · Joined: 03 Apr 2012 Posts: 11

Hey All -

After replacing plugs and resynching throttle bodies, the bike's developed a high RPM cutout (5k+) that is, to say the least, extremely disturbing. Happened under both hard and gradual acceleration, just always above 5k.

It does a quick cut, recover, cut, recover until you let off the gas. Runs great in lower RPMs and seems to be more prominent in the lower gears, but it's done it in all. The cutout feels just like the rev limiter @ the top of the range, but happening much sooner. (also feels like when you are running on a pint of gas and goose it hard).

This a.m. i filled with up, took 2.2 gallons. Rode it like I stole it for about 30 miles. No Problems.

This afternoon, took it out again in the afternoon heat. After I rode it a couple miles, parked it, then rode it again it started doing the cutout again.

Scenario like this: Riding 70 mph down the freeway, bike is completely warmed up, downshift to 3rd, run about 5-6k rpms slowly increasing (not cracking open) as soon as it starts doing so, it starts cutting, hard.

Another - after I get off the freeway, ride it in 1st, again slowly increasing RPMs - once up to about 6.5k or just before 7k, starts cutting out - way b4 the rev limiter.

Definitely it's not more than a gallon or gallon point five down from the top of the tank. Fuel filter was done 4k miles ago (bike has 18k miles), could do it again I suppose. Any other ideas?

Thanks.

1994 K1100RS
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'94 K1100RS

drikko · Posted: Mon Sep 03, 2012 10:03 pm Post subject:

It could be an FI problem, but could it be as simple as a clogged fuel filter starving the fuel pump when it's trying to get a higher flow rate?
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K1100RS '97
Laverda RGS 1000 '84
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DISCLAIMER:- Anything I say may have been when I was drunk so please don't take it personally.

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whyoldbill · Posted: Tue Sep 04, 2012 9:46 am Post subject:

This might sound stupid, but check your ground cables on the battery. There should be at least 2 heavy-gauge cables there. When I changed my battery one time, one of them had fallen in behind the battery box and my bike had the same symptoms. Drove me nuts until I found it.
BTW, I have a spare set of coils if you need them for testing. Rolling Eyes

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'02 - GL1800

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old guy old bike · Posted: Tue Sep 04, 2012 12:35 pm Post subject:

Could also be the plug wires. Problem might not even show with an ohm meter.
Jeff
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1993 K1100LT
2003 K1200GT Gone but not forgotten
2014 Victory Crossraods

sh00ter · Joined: 03 Apr 2012 Posts: 11

Changed the plugs back to the old ones. Two blocks from my house the brick died, but the fuel pump didn't kick back in until I kicked the kickstand down and back up again. Could that be the source of my woes? the kickstand sensor? Or is this a red herring??
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'94 K1100RS

Scott_Anderson · Posted: Tue Sep 04, 2012 10:50 pm Post subject:

One way to find out is to bypass it and ride it for a while. Some have bypassed it permanently, others have replaced the switch, others have modified it so that the side stand has to travel a little farther before the switch activates.

How do the springs feel that hold it up? Did you notice any bumps in the road when it was cutting out? could the side stand be "bouncing" and thus activating the switch?
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Ride safe.

1995 K1100LT 0302044
2017 FLHTK Ultra Limited
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"One who does not ask questions is ashamed to learn" Danish proverb
1997 K1100LT 0302488(R.I.P.)
1997 R1100RT ZC62149(sold)

sh00ter · Joined: 03 Apr 2012 Posts: 11

That's the thing, it was killing in 1st and 2nd on more or less smooth pavement. When I test it in the driveway at idle with the center stand down, it appears to work correctly, having to swing quite a ways from the frame in order to kick in. Maybe there's a break further up the chain.
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'94 K1100RS

sh00ter · Joined: 03 Apr 2012 Posts: 11

Well, initial reports are that bypassing the side stand switch has solved the issue. Just did 50 miles varying between gentle, but high revving and hard cracking to WOT; so far so good. Thanks to all who gave input on this.
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'94 K1100RS