Vibration while pulling in 5th/6th
Elite HDF Member
Joined: Apr 2010
Posts: 4,990
Likes: 9
From: Marina del Rey
So I don't feel the vibration in any other gears, only 5th and 6th gears and it's while pulling, example, cruising at 55mph in 5th and roll on the throttle or 6th at about 65 mph and roll on the throttle i get a strong vibration in the pegs up to the seat and in the bars...it's only in 5th and 6th gear. It almost feels like there's a loss of power too...
Stage III
Joined: Jul 2012
Posts: 3
Likes: 0
From: michigan
i have a 2007 dyna with 11000mi. on it and the vibration is all over the place I replaced front motor mount didnt help. Just took it for another ride noticed vibration is much worse at higher rpms its a very fine vibration makes my hands numb any ides thanks.
Devil's Advocate
Joined: Jun 2010
Posts: 2,070
Likes: 36
From: Alberta, Canada
Outstanding HDF Member
Joined: Nov 2010
Posts: 2,250
Likes: 36
From: Montana
the shift recommendations for the dyna in the book are for break in period. I hope it turns out the compensator is the problem . chasing down problems can be a bitch. BTW you want to ride your engine hard once in awhile or you will get more carbon build up and it will run like crap. Riding the bike too easy all the time is not good for the motor. Good luck I hope it turns out to be a simple fix for you.
Elite HDF Member
Joined: Jun 2007
Posts: 4,867
Likes: 268
From: People's Republic of Boulder Colorado
I've read that when the pressed-together crankshaft in the twin cam engines "scissors" (slips on the crank pin) it can cause the vibrations that people are describing in this thread. The way to check it is to check the runout on the camshaft side of the crank.
The MOCO has done nothing to address this problem and they hate to warranty it because of the cost. They increase the runout spec every year in an attempt to avoid warranty claims. It's up to 012" this year - which is absolutely ridiculous for an acceptable amount of crankshaft runout in any engine - plus, they just install another crankshaft that is very likely to develop the same problem again later, after the warranty has expired.
There are welded aftermarket cranks that will permanently fix it but, naturally, the MOCO won't let their dealers install one under warranty.
The MOCO has done nothing to address this problem and they hate to warranty it because of the cost. They increase the runout spec every year in an attempt to avoid warranty claims. It's up to 012" this year - which is absolutely ridiculous for an acceptable amount of crankshaft runout in any engine - plus, they just install another crankshaft that is very likely to develop the same problem again later, after the warranty has expired.
There are welded aftermarket cranks that will permanently fix it but, naturally, the MOCO won't let their dealers install one under warranty.
Last edited by jpooch00; Jul 26, 2012 at 05:28 PM.
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