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Old 02-13-2011, 04:07 PM   #1
camgregus OP
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Joined: Feb 2006
Location: on the banks of the mighty mississippi, AR side
Oddometer: 3,002
weird stalling, hesitation

My 1989 R100 GS is doing crazy stuff again. It runs and starts fine. After a couple of miles or so, it starts hesitating on acceleration in second and third gear. Stumbles like it is about to stall.

I just replaced the diode board. New ICU last year. All connections are clean and renewed. Floats show the same amount of gas. Petcocks flow well. I drained all the old gas out and put new in (it was only two or three months old....) I love my bike, but I'm just getting sick of it not treating me well enough to get it warm enough to tune....
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Old 02-13-2011, 04:34 PM   #2
The Raven
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Quote:
Originally Posted by camgregus View Post
My 1989 R100 GS is doing crazy stuff again. It runs and starts fine. After a couple of miles or so, it starts hesitating on acceleration in second and third gear. Stumbles like it is about to stall.

I just replaced the diode board. New ICU last year. All connections are clean and renewed. Floats show the same amount of gas. Petcocks flow well. I drained all the old gas out and put new in (it was only two or three months old....) I love my bike, but I'm just getting sick of it not treating me well enough to get it warm enough to tune....
Check your tank vent
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Old 02-13-2011, 05:14 PM   #3
boxerboy81
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Location: Melbourne, Oz
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Check the main jets for blockage.


..
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Old 02-13-2011, 05:32 PM   #4
bmwrench
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This sounds like classic bean-can failure to me.
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Old 02-13-2011, 06:12 PM   #5
datchew
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this sounds like classic bean-can failure to me.
+1
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Old 02-13-2011, 06:40 PM   #6
boxerboy81
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+1

+2 ...could well be, but I'd check simple things first.
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Old 02-13-2011, 06:43 PM   #7
CurlyMike
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Location: east of Dallas
Oddometer: 982
+3, thats the first thing I thought of when I read the title...

I replaced mine with the electronic version from Rick at Motorrad Elektrik, have had no issues with the new upgrade. Yet to be seen if it will last 30 years like the last one.
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Old 02-13-2011, 07:10 PM   #8
hardwaregrrl
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Hate to say it...

+3. Sounds like what happened to me when mine died.
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Old 02-14-2011, 09:10 AM   #9
Stagehand
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Hey if you need a known working beancan for test I do believe I have one I could ship to you.
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Old 02-14-2011, 09:16 AM   #10
camgregus OP
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Location: on the banks of the mighty mississippi, AR side
Oddometer: 3,002
I could use a known working beancan. I don't think it is a fuel issue. It seems electrical.. I relubed my beancan year before last and it got better.
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Old 02-14-2011, 09:28 AM   #11
DaveBall
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Had similar issue a few years back. Replaced springs on mechanical advance as old ones had lost their tension. Lubed the pivot points and problem gone.

A whole lot cheaper to throw in a set of advance springs and lube the pivots than replacing the whole can. Total cost to replace, including the delivery by mail from closest dealer - less than $5.00.
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Old 02-14-2011, 10:24 AM   #12
supershaft
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Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 8,618
I have had bean cans act like that. Spark plug caps. Coil wires shorting at certain vibrations. Carb enricher body gaskets. Coils. It could be about anything.

Remember that aftermarket bean cans uses the exact same hall effect sensor that fails in the bean cans. The mechanical advance in the the bean can rarely acts up. When it does, it will slow acceleration and/or deceleration. It won't cause cutting out. It can't. It's mechanical, not electronic.

If they only made an electronic advance for points! Then we could truly have the worst of two worlds! Kind of like the cable operated hydraulic brake!
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Old 02-14-2011, 05:43 PM   #13
camgregus OP
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plug wires and caps are good. Later black coil....

Dragons.....
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Old 02-14-2011, 05:52 PM   #14
The Raven
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Originally Posted by camgregus View Post
plug wires and caps are good. Later black coil....

Dragons.....
Might be time to go to points
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Old 02-14-2011, 06:02 PM   #15
supershaft
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This bike has points? I have seen them cause about every symptom known to the ignition system.
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