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post #1 of 11 (permalink) Old 05-02-2018, 03:15 PM Thread Starter
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Unusual Road Noise

Just asking if anyone has an identical issue? My Ď17 RGU has about 5k miles, still under warranty. When taking it in for the 5k service, I told them I hear an unusual road noise in the 70-80mph range. Hard to describe, but sort of a repeating rrr...rrr...rrr...rrr. Cycles about every half second. Sounds like an old 6 volt pickup turning over to start. Strictly engine or perhaps drive-train specific. If I let off throttle, instantly ceases, and instantly begins again when throttle reingaged. Not a noise from the pavement or from air flow. Dealer says they rode it and didnít hear it. Just returned from a trip to Arkansas, and on the highway there and back, all I wanted to hear was the purr of that M8, but all I heard was rrr...rrr...rrr... Sure want to get resolved during warranty, and it would be helpful if anyone else who may have experienced this and solved it could give me some direction on what to say next to service dept.
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post #2 of 11 (permalink) Old 05-02-2018, 03:19 PM
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Sounds like it "could" be a loose exhaust heat shield clamp. They can sometimes set a harmonic vibration like that....easy to check...
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post #3 of 11 (permalink) Old 05-02-2018, 03:26 PM
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I'd have to agree that it is more of a harmonic vibration caused within a certain speed range.

Let us know what you come up with!!!


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post #4 of 11 (permalink) Old 05-02-2018, 06:58 PM
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Tell Ďem itís harmonic and it happens under cruising load at 70-80mph. Ask them to have it tested again, preferably with someone who has better hearing than the last guy who ďcouldnít duplicate the symptomĒ, because itís definitely making a noise, and itís definitely obvious.
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post #5 of 11 (permalink) Old 05-02-2018, 07:54 PM
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I had this same type noise (I think from what your explaining) on my Fatboy with the TC88B, around steady 65 mph, started checking things and the Kuryakyn Tranny cover I had installed was left loose on one side after the dealer did some work, gave them all a twist and was good.

The RPMS and vibration thru the bike at certain RPMS can do this to loose panels, ect.. like others have said check around for loose items


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post #6 of 11 (permalink) Old 05-02-2018, 09:43 PM
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I had the same thing and I traced it to the right hand baffle in the exhaust. It had just enough clearance in the front to cause a harmonic rumble at 65-80 or so. I ended up isolating it by taking the saddlebag off and having my son literally step on the pipe causing it to flex and the sound to go away. I fixed it by mashing the front of the baffle into a slight oval shape making it fit tighter. Unfortunately most of these sounds are subjective to the rider, hard to trace and duplicate, and annoying as hell once you notice it. Good luck, I know it can be frustrating.

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post #7 of 11 (permalink) Old 05-03-2018, 12:30 PM Thread Starter
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Thank you for these responses. Harmonic vibration sounds like a good diagnosis, and also sounds like this could range anywhere from ďthat was an easy fixĒ to pulling out hair, but Iíll for sure scour the bike for anything needing tightening and see if I get lucky. Thank you all again for chiming in.
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post #8 of 11 (permalink) Old 05-03-2018, 01:18 PM
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I remember on the TC88 when they introduced the 6 speed- 5th gear had a harmonic whirl to it at a certain speed as well.... bugged the daylights out of most riders and it was traced back to the way the 5th gear was cut, which just caused a harmonic whirl..... good ole days!!


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post #9 of 11 (permalink) Old 05-18-2018, 11:22 AM Thread Starter
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So, for an update: Left RGU with dealer, and asked him to identify the harmonic vibration. He called to say he rode my bike in the 70-80mph range, and heard the repetitive noise. Let off throttle, sound goes away. Any other gears at same RPM, no noise. Slower speeds, no noise. He said he got on 3 other M8ís to run the same test, and found every one of them made the same noise. He has concluded it is an M8 related issue and is talking with MOCO. At least Iím not crazy. I donít think you could hear it very easily if you are not wearing a helmet. He guessed it has something to do with the new cut of the gear, but it could be something else in this new engine that was done to make it run smoother. So, appears it may be some time before the official mystery is identified and resolved.
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post #10 of 11 (permalink) Old 05-18-2018, 11:52 AM
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OK, all you guys with M8's need to get out there and see if you can identify this sound under the same conditions, then report back! Very interesting.


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