SV1000K3 bad handling - SV1000 Portal
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post #1 of 10 (permalink) Old 27th March 2020, 07:12 PM Thread Starter
Scooter boy
 
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Unhappy SV1000K3 bad handling

Hello,

I have a SV1000K3 that is made into a SV1000N by removing the fairing and installing an aftermarket headlight and straight handlebar.
It is also fitted with Hyperpro springs front and back.
Tyres: 1 year old Continental RoadAttack 3 120/70-17, 180/55-17

I have a problem where the bike's handling is quite bad. I first thought it was because the previous owner had lowered the front by putting the front fork higher up in the clamp. However I set this to original height by manual (6.3mm) and it makes no difference. The bike was also checked very quickly (<2min) by Hyperpro specialist who adjusted rebound/compression to be more balanced front/back. Preload is stock value from manual.

Symptoms:
- Nervous in a straight line, yet slow to turn in.
- Nervous in corners when pavement is not perfect.
- No feedback through the handlebars at all, very vague. I do have Oxford heated grips.
- Front wheel very unstable under hard acceleration, especially after shifting and going back on the throttle.

Any ideas what to check? Are these symptom of something obvious?

Thanks!
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post #2 of 10 (permalink) Old 27th March 2020, 07:55 PM
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Quote:
Originally Posted by Doubleyoupee View Post
Hello,

I have a SV1000K3 that is made into a SV1000N by removing the fairing and installing an aftermarket headlight and straight handlebar.
It is also fitted with Hyperpro springs front and back.
Tyres: 1 year old Continental RoadAttack 3 120/70-17, 180/55-17

I have a problem where the bike's handling is quite bad. I first thought it was because the previous owner had lowered the front by putting the front fork higher up in the clamp. However I set this to original height by manual (6.3mm) and it makes no difference. The bike was also checked very quickly (<2min) by Hyperpro specialist who adjusted rebound/compression to be more balanced front/back. Preload is stock value from manual.

Symptoms:
- Nervous in a straight line, yet slow to turn in.
- Nervous in corners when pavement is not perfect.
- No feedback through the handlebars at all, very vague. I do have Oxford heated grips.
- Front wheel very unstable under hard acceleration, especially after shifting and going back on the throttle.

Any ideas what to check? Are these symptom of something obvious?

Thanks!
My bike exhibits similar symptoms but is totally stock. Even does this after changing fork fluid and putting new tires on.

Have you tried refreshing stabilizer fluid? If it has air, my contribute to shakiness

Sent from my SM-G973U using Tapatalk


Thanks,
John
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post #3 of 10 (permalink) Old 27th March 2020, 08:00 PM Thread Starter
Scooter boy
 
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Quote:
Originally Posted by jjc034 View Post
My bike exhibits similar symptoms but is totally stock. Even does this after changing fork fluid and putting new tires on.

Have you tried refreshing stabilizer fluid? If it has air, my contribute to shakiness

Sent from my SM-G973U using Tapatalk
Mine doesn't have the steering damper anymore; it was removed when swapping to straight bars.
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post #4 of 10 (permalink) Old 27th March 2020, 08:19 PM
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Quote:
Originally Posted by Doubleyoupee
.... I don't think the SV1000N has a steering damper either.

The 2003 Naked SV1000 did have a steering damper. I'm no expert of any kind on the suspension dept. but getting your say set correctly, having a rear shock with a spring that works correctly for your weight, and making sure your steering head bearing isn't worn would be good things to check on.


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post #5 of 10 (permalink) Old 27th March 2020, 08:21 PM Thread Starter
Scooter boy
 
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Quote:
Originally Posted by oldbaldsob View Post
The 2003 Naked SV1000 did have a steering damper. I'm no expert of any kind on the suspension dept. but getting your say set correctly, having a rear shock with a spring that works correctly for your weight, and making sure your steering head bearing isn't worn would be good things to check on.
Yeah I realized and edited my post. It's under the headlight . Maybe I should buy 2nd hand and put it back...
I have the stock damper with hyperpro spring.
I will try and see if I can check the head bearing but makeshift front-wheel lift is probably not stable enough
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post #6 of 10 (permalink) Old 29th March 2020, 02:27 PM
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Are you sure the stock suspension linkages are there? Maybe the bike was also lowered in the back, which would explain why it's so hard to turn in and why there is so little weight on the front under acceleration.
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post #7 of 10 (permalink) Old 29th March 2020, 02:48 PM Thread Starter
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Quote:
Originally Posted by Süsser Tod View Post
Are you sure the stock suspension linkages are there? Maybe the bike was also lowered in the back, which would explain why it's so hard to turn in and why there is so little weight on the front under acceleration.
Yeah, definitely not lowered at the back. Anyway I thought I made a post here yesterday but I don't see it so i'l write again.
Yesterday I jacked up the SV and checked the head and wheel bearings. Everything is smooth and solid.

So then I started to doubt my suspension settings. I got it checked at Hyperpro 2 years ago but I went without making an appointment, so the guy literally only spent 1 minute making sure it was balanced front/back. Didn't touch preload or anything.

Decided I would check myself, so checked out some Dave Moss suspension tutorials and got to work.
To my surprise, the front suspension was rock solid..! There was maybe 10mm of sag total with me on it. ��Wound down preload and compression all the way but unfortunately still only 15mm (should more like 30+). Guessing this spring is too stiff for my weight + no fairing.

So I then decided to drop down the forks again to put some more pressure on the front. I read on here many are even dropping it by as much as 5mm so decided to give that a try (total 11mm drop).

Rider sag was now 20mm (total sag 31mm), still a bit low, guess it will be fine with full gear and tankbag etc.
Rear sag was OK at 30mm total so left that, changed compression/rebound a bit and went for a ride.

Well, for the first time since I have it the bike is stable! No longer that nervous front end.. such a difference.
Did have to tighten up the rebound both front and back; was very surprised how much the behavior was different after the oil in the suspension was warmed up. I guess it might need to be replaced ...

Not sure yet about compression damping. I've got the compression damping fully out now, but it's not bottoming out at all and still OK under full braking. Guess I'm good here?
Still not sure what to about getting a steering damper.. I'm a bit paranoid now that I remember it's supposed to be on the 1000.
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post #8 of 10 (permalink) Old 30th March 2020, 12:11 AM
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Quote:
Originally Posted by Doubleyoupee View Post
Yeah, definitely not lowered at the back. Anyway I thought I made a post here yesterday but I don't see it so i'l write again.
Yesterday I jacked up the SV and checked the head and wheel bearings. Everything is smooth and solid.

So then I started to doubt my suspension settings. I got it checked at Hyperpro 2 years ago but I went without making an appointment, so the guy literally only spent 1 minute making sure it was balanced front/back. Didn't touch preload or anything.

Decided I would check myself, so checked out some Dave Moss suspension tutorials and got to work.
To my surprise, the front suspension was rock solid..! There was maybe 10mm of sag total with me on it. ��Wound down preload and compression all the way but unfortunately still only 15mm (should more like 30+). Guessing this spring is too stiff for my weight + no fairing.

So I then decided to drop down the forks again to put some more pressure on the front. I read on here many are even dropping it by as much as 5mm so decided to give that a try (total 11mm drop).

Rider sag was now 20mm (total sag 31mm), still a bit low, guess it will be fine with full gear and tankbag etc.
Rear sag was OK at 30mm total so left that, changed compression/rebound a bit and went for a ride.

Well, for the first time since I have it the bike is stable! No longer that nervous front end.. such a difference.
Did have to tighten up the rebound both front and back; was very surprised how much the behavior was different after the oil in the suspension was warmed up. I guess it might need to be replaced ...

Not sure yet about compression damping. I've got the compression damping fully out now, but it's not bottoming out at all and still OK under full braking. Guess I'm good here?
Still not sure what to about getting a steering damper.. I'm a bit paranoid now that I remember it's supposed to be on the 1000.


You need to find out what springs are in the front. If they are the proper rate, you likely need to cut the spring shim down some to get you closer to your front sag value. Sliding the forks farther up is a band aid for not being able to properly set the front sag value.

If forks have a big change in performance as they warm up, you likely have a really low VI suspension fluid in them. I always try to run high VI fluids to mitigate this issue.

-ms
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post #9 of 10 (permalink) Old 30th March 2020, 08:17 AM Thread Starter
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Quote:
Originally Posted by schmidt314 View Post
You need to find out what springs are in the front. If they are the proper rate, you likely need to cut the spring shim down some to get you closer to your front sag value. Sliding the forks farther up is a band aid for not being able to properly set the front sag value.

If forks have a big change in performance as they warm up, you likely have a really low VI suspension fluid in them. I always try to run high VI fluids to mitigate this issue.

-ms
Yeah, you're right. However I wanted to try the lowering anyway to make it steer quicker. At first I didn't want to because it was already so unstable, but now that I've found the lowering was not the cause, I might stick with it.
After corona crisis I will probably go to Hyperpro for a proper 1 hour+ instead of 1min and see if they can lookup/determine what springs I have.
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post #10 of 10 (permalink) Old 30th March 2020, 11:33 AM
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You have done the basics, checked the headstock bearings and adjusted/greased as necessary? Same with the rear suspension bearings.
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