Misfire above 4k rpm fixed. Was: GL1100 - greater knowledge ...


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WingNutJC
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Misfire above 4k rpm fixed. Was: GL1100 - greater knowledge ...

Post by WingNutJC » Wed Feb 21, 2018 8:34 pm



Have just seen this old post:

"High rpm miss during acceleration"

viewtopic.php?f=4&t=16191 by marcsac.
That thread ended in 2016 with still no apparent fix after mind numbing amounts of work and expense.

Problem sounded almost identical to mine, so decided link the two posts under a new topic.

Have just posted the fix in my original thread, but am repeating it here:


PROBLEM SOLVED. :D :D :D

Looks like it was the earthing of the CDI units.

Had reached the point where I was completely out of ideas, and just to feel like I was doing something, I unscrewed the CDI units in case any corrosion between the heat-sink bodies and frame could be causing problems.

Nothing unusual looking, but I brightened everything up and re-fitted (with a coating of copper grease). Didn't disconnect the units.

Engine now revs cleanly past 4000 rpm. :shock: :shock: :shock:

Looks like the heat-sink earth must form an active part of the electronics, despite there being a green earth wire exiting each unit.

However, something in the back of my mind is not 100% convinced, yet I can't think of anything else I've done (or disturbed).
Time will tell.

Cheers.
:-)



DaveO430
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Re: Misfire above 4k rpm fixed. Was: GL1100 - greater knowledge ...

Post by DaveO430 » Wed Feb 21, 2018 11:17 pm

Nope, they will work laying loose, not grounded at all. Someone did come up with an idea to use a piece of a computer power supply heat sink bolted between them. Not sure if it help but doesn't hurt.

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WingNutJC
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Re: Misfire above 4k rpm fixed. Was: GL1100 - greater knowledge ...

Post by WingNutJC » Thu Feb 22, 2018 8:51 am

DaveO430 wrote:
Wed Feb 21, 2018 11:17 pm
Nope, they will work laying loose, not grounded at all. Someone did come up with an idea to use a piece of a computer power supply heat sink bolted between them. Not sure if it help but doesn't hurt.
Auuuggggggghhhhhhhhhhhhhhhhh!!!!!

Just hate that. Problem clears itself and I don't know why.

Grrrrrrrrrrrrr. :evil: :evil: :evil:

Thanks, btw. :-)

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Re: Misfire above 4k rpm fixed. Was: GL1100 - greater knowledge ...

Post by WingAdmin » Fri Feb 23, 2018 9:42 am

The higher the RPM, the more power required for a good spark. If you have any resistance anywhere, you can see this problem. Or spark leakage. It's possible that you had a weak connection somewhere, and by moving things around having them apart, you made that connection solid again. You might have inadvertently fixed it...or may have temporarily fixed it, and it will return when the connection grows weak again. You might want to check for corrosion on connections, or wires that don't look 100%.

DaveO430
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Re: Misfire above 4k rpm fixed. Was: GL1100 - greater knowledge ...

Post by DaveO430 » Fri Feb 23, 2018 5:21 pm

WingAdmin wrote:
Fri Feb 23, 2018 9:42 am
The higher the RPM, the more power required for a good spark.
Yes and I have seen on an 1100 a dead leg on the stator causing it to not charge enough and have a high RPM fall out.

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WingNutJC
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Re: Misfire above 4k rpm fixed. Was: GL1100 - greater knowledge ...

Post by WingNutJC » Sun Feb 25, 2018 11:11 am

WingAdmin wrote:
Fri Feb 23, 2018 9:42 am
The higher the RPM, the more power required for a good spark. If you have any resistance anywhere, you can see this problem. Or spark leakage. It's possible that you had a weak connection somewhere, and by moving things around having them apart, you made that connection solid again. You might have inadvertently fixed it...or may have temporarily fixed it, and it will return when the connection grows weak again. You might want to check for corrosion on connections, or wires that don't look 100%.
Thanks WingAdmin.

Agree completely. Intermittents are the pits. Grrrrr. (Once worked in telecommunications).
I've completely dismantled / removed from bike - all ignition components - down to the plug cap resistors. Fitted new coils.
That's why I looked at the CDI units - nothing else left to fiddle with. LOL
If/when the fault returns, the CDI wiring/connectors will be first up for a check.

Meanwhile I'm up to my elbows with starter motor problems. More grrrrr.

:-)

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WingNutJC
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'03 BMW R1100S

Re: Misfire above 4k rpm fixed. Was: GL1100 - greater knowledge ...

Post by WingNutJC » Sun Feb 25, 2018 11:15 am

DaveO430 wrote:
Fri Feb 23, 2018 5:21 pm
WingAdmin wrote:
Fri Feb 23, 2018 9:42 am
The higher the RPM, the more power required for a good spark.
Yes and I have seen on an 1100 a dead leg on the stator causing it to not charge enough and have a high RPM fall out.
Thanks Dave. Battery voltage rises to 13.4V off idle and holds at higher revs.

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Re: Misfire above 4k rpm fixed. Was: GL1100 - greater knowledge ...

Post by DaveO430 » Sun Feb 25, 2018 2:47 pm

WingNutJC wrote:
Sun Feb 25, 2018 11:11 am


Agree completely. Intermittents are the pits. Grrrrr. (Once worked in telecommunications).
I've completely dismantled / removed from bike - all ignition components - down to the plug cap resistors. Fitted new coils.
That's why I looked at the CDI units - nothing else left to fiddle with. LOL
If/when the fault returns, the CDI wiring/connectors will be first up for a check.

Meanwhile I'm up to my elbows with starter motor problems. More grrrrr.

:-)
Just FYI it is NOT CDI ignition, it is electronic controlled ignition. A common mistake. CDI is used on lawn mowers, chain saws, dirt bikes and ATVs and other things that don't have to have a battery to run.

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WingNutJC
Posts: 67
Joined: Tue Sep 03, 2013 9:12 am
Location: Brisbane, Australia.
Motorcycle: GL1100 Standard
Goldwing Streamliner
'03 BMW R1100S

Re: Misfire above 4k rpm fixed. Was: GL1100 - greater knowledge ...

Post by WingNutJC » Sun Feb 25, 2018 11:52 pm

DaveO430 wrote:
Sun Feb 25, 2018 2:47 pm
WingNutJC wrote:
Sun Feb 25, 2018 11:11 am


Agree completely. Intermittents are the pits. Grrrrr. (Once worked in telecommunications).
I've completely dismantled / removed from bike - all ignition components - down to the plug cap resistors. Fitted new coils.
That's why I looked at the CDI units - nothing else left to fiddle with. LOL
If/when the fault returns, the CDI wiring/connectors will be first up for a check.

Meanwhile I'm up to my elbows with starter motor problems. More grrrrr.

:-)
Just FYI it is NOT CDI ignition, it is electronic controlled ignition. A common mistake. CDI is used on lawn mowers, chain saws, dirt bikes and ATVs and other things that don't have to have a battery to run.
Point taken. Being too liberal with the jargon. Easier to type than "ignition module". :oops:



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