head shake-tank slapper-on decel

[leem00]

Ok so here is the story ...

I stored the bike last winter...made some modifications, givi v35, givi e55n bags and top case...

Well I didn't check the tire pressures and rode the bike home (150 miles) with a low front tire pressure (20psi)

I was getting head shake on decel at around 40 mph...

I filled up the front and rear tires...and I was still getting the head shake...

Now I took the bags off tonight and rode the bike...guess what!

No head shake!!!

So I am guess that the weight from the bags is lightening up th front to much...

any one have any suggestions????

 

[leem00]

Can one of you edit the title to say on Decel?

 

[MNGreg]

WOW you must be a really tiny person to not have enough weight up front still to offset the bags. No clue on resolution here - sorry

-only side thought is with extra weight in back now, maybe raise your shock setting a click at a time and see what happens?

 

[leem00]

head shake-tank slapper-

WOW you must be a really tiny person to not have enough weight up front still to offset the bags. No clue on resolution here - sorry

-only side thought is with extra weight in back now, maybe raise your shock setting a click at a time and see what happens?

5 ' 7" 200 lbs

And I maxed the rear shock out.... I don't know what else to do



Sent from some where in the universe by my iPhone using Tapatalk

 

[buzzbomb]

5 ' 7" 200 lbs

And I maxed the rear shock out.... I don't know what else to do



Sent from some where in the universe by my iPhone using Tapatalk

200lbs and you've maxed the rear shock out? Methinks that be the problem. Your rear shock is solid as a rock.

I would suggest dropping it back to the number 3 setting. See how it feels and go from there.

 

[leem00]

200lbs and you've maxed the rear shock out? Methinks that be the problem. Your rear shock is solid as a rock.

I would suggest dropping it back to the number 3 setting. See how it feels and go from there.

Not with the bags on...

 

[abyss1406]

soften up the rear a bit then give a go

 

[bmw675]

More spring pre load on the rear is making it take more of the weight. Not enough is transferring to the front.

Before you change anything, go out and do some monster wheelies. :mikebike:

 

[Detrich]

^ ditto what Bmw said. GPR steering dampened might help too. But seems like weight distribution is the core issue

 

[Marthy]

Been there too with my ride. Drop off the front 3/8" and give it a go with preload close to max out. Not as much the weight than the aero I think. It was worst when I had the PR2 on... I end up changing them...

 

[leem00]

Been there too with my ride. Drop off the front 3/8" and give it a go with preload close to max out. Not as much the weight than the aero I think. It was worst when I had the PR2 on... I end up changing them...

So you think the aero push on the bags is causing the fron to lighten up to much?

Never thought about it that way... I may try it with out the top trunk...the e55n is huge!

 

[Superzoom]

Did a bit of reading on head shake and it sounds like it might be one of three problems:

1) Wheel/tire out of balance or worn.

2) Not enough trail, or steering is too twitchy (so that would go opposite of what some of the suggestions in this thread are saying. Try softening your rear shock to decrease steering angle).

3) Head bearing problems.

Shucking the Shakes

I have hard bags on my bike and have never experienced head shake on decel. Lots of head shake when accelerating hard, though.

Good luck with the diagnosis!

 

[ajskillz13]

I've noticed this issue with the bags on as well. It is really only an issue for me if I take my hands off the bars and if there's significant wind. I do wish there was a better way to shift some of that weight forward. The front end definitely feels lighter than it should with my wife and the full luggage on.

 

[leem00]

I've noticed this issue with the bags on as well. It is really only an issue for me if I take my hands off the bars and if there's significant wind. I do wish there was a better way to shift some of that weight forward. The front end definitely feels lighter than it should with my wife and the full luggage on.

I am going to try it with out my top trunk...If I have no issues there..then I know its a weight distribution issue and I will try dropping the front like marthy suggested. Beyond that I have no idea what to do and will probably ask for help from some local mechanics.