Wobble In Left Hand Turns - Ducati.ms - The Ultimate Ducati Forum
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post #1 of 18 (permalink) Old Jul 22nd, 2015, 8:59 am Thread Starter
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Wobble In Left Hand Turns

My 2012 SFS bought new in 2013 with 7700 miles seems to wobble or get mild head-shake in high speed left hand sweepers. Any clues to why?

I can only think it could be tires or suspension. My tires are BT003RS with lots of tread, could they come out of balance?

It did roll off its kickstand a year ago on a lumpy driveway on the left side but only damaged the CRG mirror, scuffed the foot peg and put a tiny scratch on the water pump - that's all.

I hope I can sort this out it is kind of scary.

Any ideas?

2012 SFS
2014 BMW GS800 Adventure
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post #2 of 18 (permalink) Old Jul 22nd, 2015, 9:21 am
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Try to realign the forks. If you search you can find the procedure .

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post #3 of 18 (permalink) Old Jul 22nd, 2015, 9:22 am Thread Starter
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I will research that. Thanks.

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post #4 of 18 (permalink) Old Jul 22nd, 2015, 10:48 am
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If you dont follow the proper installation sequence for the front wheel, you can incorrectly align the front axle in the forks which will cause unwanted friction in the fork tubes and handling oddities.

You can use a dowel inserted from the left side to hold the wheel in position. Put anti-seize or grease on the axle and then insert it from the right side (of the bike). To avoid damaging the thin-walled axle, tap it in gently and rotate it using the special tool from your Ducati tool kit. Once it is in, line up the holes in the axle with the holes in the axle clamps so that the through-holes allow screwdriver access to the compression valve adjusters.

The common mistake made here is to just tighten everything up at this point. Instead, heres the proper sequence to assure that the forks are aligned.

Temporally tighten-up the two RIGHT side axle clamp bolts so you can torque the axle nut.

Put on the (left side) 28 mm axle nut and torque it (63 Nm).
Then torque the two LEFT side clamp bolts (19 Nm).

Now, put the brake calipers back on using the proper torque setting (43 Nm).

Now, loosen the two RIGHT side clamp bolts.

Take the bike off the paddock stand, and bounce the suspension up and down till you are sure that the right side fork has moved to the proper (neutral) position along the axle.

Once this is done, torque the two RIGHT side clamp bolts to 19 Nm, reconnect the speedometer cable, and youre done.

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post #5 of 18 (permalink) Old Jul 22nd, 2015, 11:47 am
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are both fork settings the same?

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post #6 of 18 (permalink) Old Jul 22nd, 2015, 11:52 am Thread Starter
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Quote:
Originally Posted by Shazaam View Post
If you dont follow the proper installation sequence for the front wheel, you can incorrectly align the front axle in the forks which will cause unwanted friction in the fork tubes and handling oddities.

You can use a dowel inserted from the left side to hold the wheel in position. Put anti-seize or grease on the axle and then insert it from the right side (of the bike). To avoid damaging the thin-walled axle, tap it in gently and rotate it using the special tool from your Ducati tool kit. Once it is in, line up the holes in the axle with the holes in the axle clamps so that the through-holes allow screwdriver access to the compression valve adjusters.

The common mistake made here is to just tighten everything up at this point. Instead, heres the proper sequence to assure that the forks are aligned.

Temporally tighten-up the two RIGHT side axle clamp bolts so you can torque the axle nut.

Put on the (left side) 28 mm axle nut and torque it (63 Nm).
Then torque the two LEFT side clamp bolts (19 Nm).

Now, put the brake calipers back on using the proper torque setting (43 Nm).

Now, loosen the two RIGHT side clamp bolts.

Take the bike off the paddock stand, and bounce the suspension up and down till you are sure that the right side fork has moved to the proper (neutral) position along the axle.

Once this is done, torque the two RIGHT side clamp bolts to 19 Nm, reconnect the speedometer cable, and youre done.
Thanks! I will check this out

Quote:
Originally Posted by -ftp- View Post
are both fork settings the same?
I have never adjusted the suspension on this bike so I think so...

2012 SFS
2014 BMW GS800 Adventure
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post #7 of 18 (permalink) Old Jul 22nd, 2015, 4:23 pm Thread Starter
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I found this page, lots of good leads.

Diagnosing Steering Wobbles Bareass Choppers Motorcycle Tech Pages

I do not have a lot of time this week to diagnose but I will keep you posted.

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post #8 of 18 (permalink) Old Jul 22nd, 2015, 11:59 pm
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So you're telling me you have an SFS and never touched the factory settings for the forks and shock ?

You need to work this, first correct sag.

Then you would be surprised how many bikes leave the factory with forks compression and rebound not adjusted the same. Verify.

Align forks

If the above doesn't do the trick i put my bet on the tire.

And i still doesn't get the point of paying more for ohlins stuff just to leave it alone, and not adjust/dial it for YOU.

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post #9 of 18 (permalink) Old Jul 23rd, 2015, 11:51 am Thread Starter
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Quote:
Originally Posted by Ricko View Post
So you're telling me you have an SFS and never touched the factory settings for the forks and shock ?

You need to work this, first correct sag.

Then you would be surprised how many bikes leave the factory with forks compression and rebound not adjusted the same. Verify.

Align forks

If the above doesn't do the trick i put my bet on the tire.

And i still doesn't get the point of paying more for ohlins stuff just to leave it alone, and not adjust/dial it for YOU.
I agree.

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2014 BMW GS800 Adventure
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post #10 of 18 (permalink) Old Jul 23rd, 2015, 12:09 pm Thread Starter
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I had a chance to look at it last night. I found the left fork has moved up in the triple tree.

I will adjust this tomorrow, hopefully it will be settled.

Does anyone know if I should bring the left fork down or the right fork up? My service manual is at home.
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