hello friends, sorry for the English translation. I have a problem in a 2010 Fat Bob. When I place 6th speed begins to vibrate. This problem does not make it in 4th or 5th speed and SAME speed per hour. The wheels are new (tires). can be a problem in the gearbox?.
Thank you very much and greetings from Chile Fernand

 

what speed are you at in 6th gear when you feel the vibration? Is the bike stock?

 

at 120 km/h and when icreased the speed is bigger the vibration. Te bike is original, only have screaming eagle filter, V&H and fuel pak

 

whats 120km in mph?

What I'm getting at is I think you are lugging the motor. Try not using 6th gear until you are over 70MPH. Do you experience any vibration in 6th gear at 80mph? Better to shift later then earlier

 

at 130 km/h (80 mph) the problem is the same, and 90mph the vibration increased..., not intolerable, but it feels

 

There are two common problems that you need to check out:
1. steer head bushing adjustment (look up how to do the "fall away" test)
2. Front motor mount

If you do a search here on both you will get a lot of info and some pics

Good luck

 

thank you , what is, (engine part) front motor mount??, i can´t translate this. Thank you!

 

120kph is about 75mph.

 

Item # 16 in this parts diagram...

 

At first I thought lugging as well. But 75 it should smooth out for sure, without lugging being an issue. Now I'm real curious about the fall away test. Have to check that out. Good luck fernand.