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I also had a vibration at the same RPM's found out that the top bolt in the engine guard was broken. Drove me nuts to find too because it would happen in every gear at that speicific RPM range. Hope that is is something simple as the bolt to replace.
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Dyna2319
06 FXDWHI with more mods than both the wife and girlfriend know about
Too busy to start with it this weekend. Mama and the kids took over. So I will check over and test this week.
Sturgis has all the dealers around here just swamped with bikes broken down.
LOL's
At least for now my bikes not there yet.
Just picked up a low mileage 2005 FXDXI with excessive high freq. vibration in the same speed range [2800-3100 RPM].
Interesting, uh?
I think I see some damage to the front mount rubber isolator. Going to get some help checking the motor mounts as that is the most likely cause from what I've read.
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It's not much of a tail, but I'm sort of attached to it."
Dealership said that the top motor mount was loose and that they performed the alignment where you loosen the motor mount bolts, run the engine, and then re torque the bolts.
The service tech thought they had improved it but after riding it today, I can't tell much difference -- still really buzzy 2800-3100 rpm. It's very smooth at 3400 and up so I'm keeping the engine wound up a little more than usual for cruising.
May try the front motor mount shimming trick next.
Love the bike, but it is the buzziest of the five TC88 based Harleys I've had.
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It's not much of a tail, but I'm sort of attached to it."
I bought the bike used so I don't know how long it's been doing this. I suspect it was doing it all along and the previous owner just thought it was normal as it really isn't that bad. If I hadn't owned several recent model TC88's, including two Dynas, I might not have noticed it.
The symptoms are very much like those reported by other Dyna owners -- down to the specific RPM range. and several have had success shimming the front motor mount.
I also suspect the tuning. It may have a flat spot in that RPM range.
If tightening some other bolts and trying the shim doesn't do anything, I may get the tuning looked at. It has SE II's on it and I was told it had the Stage 1 download. The bike was immaculate so I doubt the previous owner put the SE II's on and didn't
do the Stage I. It "feels" like Stage 1 bike.
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It's not much of a tail, but I'm sort of attached to it."
Two weeks ago tried taking the hw pegs off.
Vibration still there.
Took it to a shop and had the comp tested.
No it's not a motorcycle shop but one of the techs there works on bikes after hours.
I work there part time for mad money.
Tested at front 160.
Tested at rear 151.
Leak down test brought forth indications of a weak exhaust valve seal on the rear cylinder.
I am seriously now thinking of doing an after market big bore.
The main cause of the isolated vibration was the top motor mount.
It was shot.
So with that worn mount I am also thinking of getting the crank welded, pinned, and balanced.
Took it to the dealership to get the mount replaced for nothing.
