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Old Apr 28th 2019, 10:44 PM   #1
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Misfire and low power at low revs.

Hi,

Got a problem were I get misfires and reduced power off idle to about 3k rpm. I though it might be the map sensors but I replaced both with no change. Engine is smooth and runs fine over 3k rpm. Bike idles fine after it warms up but initially is rough. Bike has a tuneboy tune but I noticed the same problem when I use a standard Ecu. Any ideas? Spark plugs perhaps

Thanks in advance.


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Old May 4th 2019, 05:32 PM   #2
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Replaced the plugs and problem resolved. Old plugs didnt look too bad, maybe a little rich. For those wanting to change the plugs make sure you allow for a few hours for the horizontal plug and you will need to remove the radiator frame, fan assembly and battery assembly which is a PIA.
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Old May 5th 2019, 10:16 AM   #3
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Originally Posted by tteitei View Post
Replaced the plugs and problem resolved. Old plugs didnt look too bad, maybe a little rich. For those wanting to change the plugs make sure you allow for a few hours for the horizontal plug and you will need to remove the radiator frame, fan assembly and battery assembly which is a PIA.
Glad you sorted it. How many miles were on the bike when the problem surfaced? Were the plugs previously changed?
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Old May 5th 2019, 04:22 PM   #4
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Problem started around the 9K klm mark and gradually got worse. Changed plugs at the 11k KLM’s mark. Plugs had never been changed before.


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Old May 5th 2019, 06:13 PM   #5
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Interesting. That is not very many miles at all to have spark plugs go bad. The interval in the manual for my Multistrada is 30,000 Km.
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Old May 5th 2019, 07:31 PM   #6
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Originally Posted by tteitei View Post
Hi,

Got a problem were I get misfires and reduced power off idle to about 3k rpm. I though it might be the map sensors but I replaced both with no change. Engine is smooth and runs fine over 3k rpm. Bike idles fine after it warms up but initially is rough. Bike has a tuneboy tune but I noticed the same problem when I use a standard Ecu. Any ideas? Spark plugs perhaps

Thanks in advance.


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(if you're running the pre-loaded maps) Does your tuneboy seem like its excessively rich? I know mine does, and i've thought about changing it to avoid fouling plugs.
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Old May 5th 2019, 11:19 PM   #7
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Originally Posted by tteitei View Post
Hi,

Got a problem were I get misfires and reduced power off idle to about 3k rpm. I though it might be the map sensors but I replaced both with no change. Engine is smooth and runs fine over 3k rpm. Bike idles fine after it warms up but initially is rough. Bike has a tuneboy tune but I noticed the same problem when I use a standard Ecu. Any ideas? Spark plugs perhaps

Thanks in advance.


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You only need to remove the little hatch on the front radiator shield to get access to the spark plug cap and spark plug. Be really careful removing the plug cap and lead, and when you put it back on, spray a bit of WD40 on it to ease future removal, and prevent moisture damage.
Make sure the rear cylinder spark plug lead isn't pinched between the frame and the fuel tank, too, and put a cable tie on each spark plug cable boot where they plug into the coils to prevent them popping off when the heat causes the small amount of air sealed into the rubber boot to expand.
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Old May 6th 2019, 03:27 AM   #8
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Originally Posted by tyguidry View Post
(if you're running the pre-loaded maps) Does your tuneboy seem like its excessively rich? I know mine does, and i've thought about changing it to avoid fouling plugs.


I had a look at the old plugs and they did look rich so you maybe right about the problem with the maps. If it weren’t such a bitch to change the plugs I wouldn’t worry about it.


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