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[ultrafxr]

That could be a good name for a 60s rock band, lol.  But I noticed something today that has me stumped.   

Backing out of my garage today with the motor running and when I applied the front brake to stop the bike from moving I noticed a vibration.  Further investigation reveals that with the motor idling and the bike completely stopped if I apply either the rear or the front brakes the motor vibrates.  Of course these v-twins vibrate at idle but when the brake is applied the vibration increases.

So I experimented.  Bike completely stopped with engine idling.  Does not matter if in neutral for first gear - same result.  Apply rear brake only and engine vibrates a little more.  Apply front brake only and engine vibrates much more - noticeably more, handlebars shake.  More noticeable from just a cold start.  Once motor warmed up it was still there but less so.

Only thing I can think of is ABS causing this.  But I cannot see why it would.     Don't think this is anything new.  Probably been doing this all along and I just happened to notice it today.

[grc]

That could be a good name for a 60s rock band, lol.  But I noticed something today that has me stumped.   

Backing out of my garage today with the motor running and when I applied the front brake to stop the bike from moving I noticed a vibration.  Further investigation reveals that with the motor idling and the bike completely stopped if I apply either the rear or the front brakes the motor vibrates.  Of course these v-twins vibrate at idle but when the brake is applied the vibration increases.

So I experimented.  Bike completely stopped with engine idling.  Does not matter if in neutral for first gear - same result.  Apply rear brake only and engine vibrates a little more.  Apply front brake only and engine vibrates much more - noticeably more, handlebars shake.  More noticeable from just a cold start.  Once motor warmed up it was still there but less so.

Only thing I can think of is ABS causing this.  But I cannot see why it would.     Don't think this is anything new.  Probably been doing this all along and I just happened to notice it today.

If you want to verify if it's the ABS pump, you could pull the fuse or disconnect the wiring connector and then apply the brake at idle and see if you no longer get the same vibration.  The ABS module is supposed to be rubber mounted to isolate the frame and rest of the bike from vibration and noise, but it's probably not 100% effective considering it's a Harley.  


Jerry

[dartman]

The front and rear suspension dampen vibration considerably watch your front wheel at Idle there is considerable movement, when you lock that wheel with the brake the vibes are transmitted to the frame, every bike ive ever owned has done this ABS or not.

[110tHunDer]

 
Jerry, my '12 does what you are talking about a lot more than my '00 does or my '04 did, but they all do it to some degree.  The '12 seems to have gotten better with time, but it's still more pronounced on that bike than the others for some reason, not sure why. 

[ultrafxr]

Thanks guys for the replys.  Never noticed this on my '07 or even on the '11 ruse I had for a year.  May have done it but just did not notice. 

Not really going to worry about it however.

[Ed Ramberger - One_Screamin_Eagle]

It's normal and here is why.  Watch your bike at idle sitting in neutral and you'll see the shake in the bike/wheels etc.  Now, when you hit the brake, the wheel no longer moves free of the chassis and the wheel is now one with the forks.  The vibration is now transferred through the hydraulic system into the chassis. 

[Doc 1]

It's normal and here is why.  Watch your bike at idle sitting in neutral and you'll see the shake in the bike/wheels etc.  Now, when you hit the brake, the wheel no longer moves free of the chassis and the wheel is now one with the forks.  The vibration is now transferred through the hydraulic system into the chassis. 

I agree with Ed.....it's very noticeable with the frt brake applied.
Doc