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Rear-end dips when cracking throttle? - video

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Old Dec 17, 2010 | 07:12 AM
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Default Rear-end dips when cracking throttle? - video
I'm new to modifying Harleys. I have an old 80" evo RKing that I have enjoyed for many years, and I just purchased to this "slightly modified" 2008 Road Glide. Got 14" of snow the day I started to inspect it so no test ride yet...or probably for months.

It had 103 (SE255 cams, PCV) Baker DD7 trans, True-Track, and 18" rims installed prior to my purchase. When I was inspecting it, I noticed the entire rear-end of scooter dips when cracking throttle (video below).

Is this normal with any of the upgrades described above? Not that I dislike its movement, just checking with those much more knowledgeable than me. All motor mounts look OK, 20lbs in air shocks.

I'm thinking the True-Track stiffens the drivetrain and causes this?

Let me know what you think? Notice I can't initially remember the tech's name that was helping me...Oopps

http://www.youtube.com/watch?v=m8Cg75KcmC8
 
Last edited by djw479; Dec 17, 2010 at 07:15 AM.
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Old Dec 17, 2010 | 07:20 AM
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dont know if its normal but my 90 evo does the same thing. also a friend was working on a sporty that also id it.
 
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Old Dec 17, 2010 | 07:24 AM
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I would be inclined to think its the counter action to the engine rotation.
 
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Old Dec 17, 2010 | 07:34 AM
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Originally Posted by EasternSP
I would be inclined to think its the counter action to the engine rotation.
I'm sure this is the case. The engine is probably pulling up on the front mount and pushing down on the rear mount when you blip the throttle.

Like the dealer would say its "normal"
 
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Old Dec 17, 2010 | 07:36 AM
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Originally Posted by EasternSP
I would be inclined to think its the counter action to the engine rotation.
It IS the counter rotation of the engine. The torque of the engine pivots the engine toward the rear causing the dip. Totally normal and should do it on any Harley. Especially a hopped up one.
 
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Old Dec 17, 2010 | 08:35 AM
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Nice to see torque in action.
 
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Old Dec 17, 2010 | 09:01 AM
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Seriously? This is bothering you? and these two techs couldn't explain it?
 
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Old Dec 17, 2010 | 09:09 AM
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Same thing you see in a muscle car when the engine is reved up at a stop light. My corvette does it at idle, I love it.

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Old Dec 17, 2010 | 10:10 AM
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That dude has got like spider fingers.

lp
 
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Old Dec 17, 2010 | 10:26 AM
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Originally Posted by Guntoter
It IS the counter rotation of the engine. The torque of the engine pivots the engine toward the rear causing the dip. Totally normal and should do it on anything with an internal combustion engine bolted to the frame. Especially a hopped up one.
Fixed.
 
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