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Old October 8th, 2019, 08:22 PM   #1
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Hypermotard 821, flat spot

I bought my 2014 Hypermotard 821 2nd hand & came with an Arrow slip on exhaust. This bike has a frustrating habit of decelerating when winding the throttle on from idle & makes stalling at traffic lights a problem.
I had it at the dealer recently who couldn't rectify the 'flat spot' & said I may need to get an 'up map' to program the ECU for the arrow exhaust?
I have read that the fueling off idle on this model may be a common problem? anyone have experience here?
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Old October 9th, 2019, 06:07 AM   #2
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I have a '13 Hyper sp w/arrow slip on and stock ecu mapping it runs fine no issues with stalling. It does hunt for it's idle when coming to a stop and the clutch is pulled in. I also have an exhaust servo eliminator but saw no difference in bike behavior with it other then exhaust sound not getting muffled.
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Old Yesterday, 12:42 AM   #3
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I see the booster plug advertised with claims that it eliminates fueling issues, hunting & stalling. Has anyone tried one of these?
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