i know these bikes vibrate but lately i have noticed excessive vibration on acceleration through all gears then once i smooth out at one speed (on highway) it seems smooth.But around town vibration seems to much any help would be appreciated.Bike is a 05 rkcustom,vance&hines true duals,custom map,speeds performance plus intake,screaming eagle real six speed.

 

Did this just start or an ongoing problem?Checking the bike for something loose or touching would be the 1st thing Id look for-Im sure you have already.Motor mount would be the next item since it happens under power.Bad plugs would be a long shot or maybe its in your tune.Timing?Faulty ign coil,wheels or tire damage,top motor mount,or trans to motor alignment esp primary chain.

 

Compresion ck?Rear belt alignment,tightness?

 

Front motor mount, do a search. 05 had some funked up stuff going on with the front mounts.

 

Ditto Pittguy. It is probably a looser than normal drive belt. Check your owner's manual for the drill on how to determine if the belt tighness is correct. I had the same problem. Moving the rear wheel assembly .025" to the rear by the adjusters took care of the viberations. ............ BC

 

Bottom motor mount is my guess - very easy to check and to re-torque. All the motor mounts should be periodically inspected.

 

Ive changed so many front lower motor mounts on those bikes its not even funny. I just replaced 2 in the last 5 days on a 04 roadking & 05 dresser that only had 4200 miles on it. Including putting about 5 on my last two roadkings. Look underneath the front of the bike upwards @ the mount and look for tears in the isolator part of the mount. Goodluck.
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Known problem with late bikes. I too noticed more vibration on my western states ride this summer. Stopped in Portland for oil change and found out a mount had failed. Replaced under warranty. Take it in I BET you have a faulty mount too.