Does tuning affect vibration?
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Tourer
Joined: Jul 2014
Posts: 320
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From: Twin Lakes, WI
Does tuning affect vibration?
As I went into in another section of this forum, I’ve been complaining about vibration on a 2018 FLFBS that is new to me. So the M8 has hard mounting and twin balance shafts. Harley techs say it’s normal vibration coming through the frame not related to wheel balance. I find the vibration excessive. It has SE slip ons and intake and was supposed to have the correct Harley tune. Can a better tune reduce vibration?
Grand HDF Member
Joined: Aug 2018
Posts: 4,126
Likes: 2,117
From: W. MI.
A crappy running motor will vibrate more than a properly tuned motor. Without knowing what you have done (if anything) to your motor makes a difference. How many miles? Stock, any change to stock tune, slip-ons? I've seen slip-ons and even improperly gapped plugs make a difference. Original plugs? Champions run like **** in all my bikes and caused them to run like crap adding vibration. Autolites are my plug of choice and run best at .041. It's all been trial and error and an individual's personal preference. Champions used to make Harley's plugs. To each their own!
You state "rigid mount" ie: direct bolt to the frame? Are you saying there are no motor mounts on a bike this new? Wasn't aware that Harley " rigid mounted" anything in years? My 96 Springer is rigid mount and has less vibration than my Ultra, runs like a watch. Start simple. Have you checked the mounting, tight? Change the plugs and gap. Run premium or the cheapest gas? There are arguments all over the place about fuel octane and performance, just like oil. If the dealer won't help start checking things yourself. Start simple and see what happens. Oh, if you came off a Honda, welcome to a Harley.
You state "rigid mount" ie: direct bolt to the frame? Are you saying there are no motor mounts on a bike this new? Wasn't aware that Harley " rigid mounted" anything in years? My 96 Springer is rigid mount and has less vibration than my Ultra, runs like a watch. Start simple. Have you checked the mounting, tight? Change the plugs and gap. Run premium or the cheapest gas? There are arguments all over the place about fuel octane and performance, just like oil. If the dealer won't help start checking things yourself. Start simple and see what happens. Oh, if you came off a Honda, welcome to a Harley.
Last edited by Bass Player; Apr 29, 2020 at 07:52 AM.
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,071
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with today's efi, not that likely.
however, a slightly rich mixture can borderline on what they call 4 cycling and this can lead to misfire and vibration.
now that said, on efi, bad O2 or borderline lean can cause surge, but vibration??? good?
however, a slightly rich mixture can borderline on what they call 4 cycling and this can lead to misfire and vibration.
now that said, on efi, bad O2 or borderline lean can cause surge, but vibration??? good?
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