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SV650 Gen2 (03-15) Tech Info, advice or questions specific to the 2003-2015 model SV650.

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Old 09-21-2019, 10:57 PM   #1
peso piuma 696
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SV650 Geometry fix

Hi all. Like so many, I've got an SV650 with a k5 gixxer front end. Mine's been 'streetfightered' with with tapered bars mounted into the top clamp.
My problem is the bike sacrificing instability for cornering performance. As much as I enjoy the 'flickability' of this bike, it's too unstable to really push the bike through fast sweepers on road or track. The bike literally turns too fast even with the stock heavy wheels; I'm more than happy to sacrifice some turning speed for stability. I don't know enough about geometry to go about fixing the problem the best way. I know I can remove the triple tree and mill out the centre and fit a gixxer 750 k6 up (06-09 are the same fork right?) bottom clamp and forks which will net me an extra 13mm in length. That plus the 70 profile front tyre will get me pretty close to the stock SV fork lengths. But it doesn't fix my rake issue. Judging by how much closer the forks are to the radiator, I'm guessing Iv'e lost some wheelbase, could I consider extending the swingarm an inch? I haven't pulled the trigger on a decision as I'm worried of screwing the whole bike up!
Thanks for any help!
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Old 09-23-2019, 01:04 PM   #2
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Re: SV650 Geometry fix

Lowering the rear a touch with either a slightly shorter shock or lowering links would give it a bit more rake and slow the turning a bit. Not sure if you're tall or short or if that would have other undesirable effects for your riding style. Something else to consider is a GSXR rear wheel, with a wider tire, is reported to slow turning a bit. I put one on mine, but I didn't ride it before so I can't comment on how much it changed.
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Old 09-23-2019, 01:59 PM   #3
busdriver
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Re: SV650 Geometry fix

Look into extended fork caps. That will give you an additional 20mm or so of length on the fork tubes. You haven't mentioned what shock is on the rear, but that could be affecting things as well.

Assuming you have a stock length rear shock, the 20mm longer fork tubes and a 70 front tire should put your geometry back to stock.
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Old 09-23-2019, 02:19 PM   #4
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Re: SV650 Geometry fix

as stated, extended caps are a decent option but I'm not sure they're still available for 04/05 forks

06/07 are comp/rebound while 08/09 have separate high and low speed comp, plus rebound. in both cases 600 is gold and .90 fork springs/softer valving and 750 is black with 1.0/firmer valving.

I wouldn't want to extend the wheelbase any more than you get from correcting fork length.
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Old 09-28-2019, 03:49 AM   #5
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Re: SV650 Geometry fix

Quote:
Originally Posted by Junkie View Post
as stated, extended caps are a decent option but I'm not sure they're still available for 04/05 forks

06/07 are comp/rebound while 08/09 have separate high and low speed comp, plus rebound. in both cases 600 is gold and .90 fork springs/softer valving and 750 is black with 1.0/firmer valving.

I wouldn't want to extend the wheelbase any more than you get from correcting fork length.
I don't think they are, I tried everywhere..

I see, so 06/07 and 08/09 and 600/750 are all interchangeable, just different internals?

Yes, that is what I intend. The problem is, all is not all the same. For example, raising the rear 10mm, dropping the front 10mm, decreasing wheelbase by 10mm, are all the same measurement and all in favour of increasing turning speed, but the size of the effect will vary with each individual adjustment... So I have no idea how much extra wheelbase to give it..
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Old 09-30-2019, 10:07 AM   #6
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Re: SV650 Geometry fix

Quote:
Originally Posted by peso piuma 696 View Post
I don't think they are, I tried everywhere..

I see, so 06/07 and 08/09 and 600/750 are all interchangeable, just different internals?

Yes, that is what I intend. The problem is, all is not all the same. For example, raising the rear 10mm, dropping the front 10mm, decreasing wheelbase by 10mm, are all the same measurement and all in favour of increasing turning speed, but the size of the effect will vary with each individual adjustment... So I have no idea how much extra wheelbase to give it..
you can put any matched set from that age range in any of those triples, yes. I wouldn't want to mix and match left vs right fork though.

also the 06/07 vs 08/09 use a different size hole in the bottom of the stem if you use that style front stand
Quote:
Originally Posted by peso piuma 696 View Post
The k4/5 gixxer forks that are on there, are the same diameter in the top clamp as the 06-09. But the newer fork is 1mm slimmer on the bottom clamp. I've heard you can mill out the hole running through the centre tree from 22mm to 25mm which will allow the newer bottom clamp to slide in and then I can put the newer forks in. This will gain me 13mm in length, plus fork cap extenders are common for this fork which will net me up to 30mm in adjustment. With a 70 profile tyre, I should be right. Right?
I believe it's 25mm to 28mm but I could be remembering wrong.

if you're taking it to a machine shop they'll want you to bring the new lower triple so they can get the fit right.

I'd start off just running those forks at stock length and spending money on a decent shock, as that's your weak point.

and as long as you don't pull the forks through the triples I don't think you need to worry about the fender hitting the radiator etc
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Old 10-02-2019, 06:58 PM   #7
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Re: SV650 Geometry fix

Quote:
Originally Posted by Junkie View Post
you can put any matched set from that age range in any of those triples, yes. I wouldn't want to mix and match left vs right fork though.

also the 06/07 vs 08/09 use a different size hole in the bottom of the stem if you use that style front stand. I believe it's 25mm to 28mm but I could be remembering wrong.

if you're taking it to a machine shop they'll want you to bring the new lower triple so they can get the fit right.

I'd start off just running those forks at stock length and spending money on a decent shock, as that's your weak point.

and as long as you don't pull the forks through the triples I don't think you need to worry about the fender hitting the radiator etc
Sweet, that's good. I see, I'll try keep left on left and right on right!

I think your right, I remembered it was a 3mm increase and there was a 25 in there. Couldn't remember if it was 22-25 or 25-28.

Thanks for the heads up.

Yeah, the rear shock is the next priority.

Also, will the new forks bolt up to the current wheels and brakes, or do I need to swap the whole front end again?

Thanks for your help dude!
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Old 09-24-2019, 02:01 AM   #8
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Re: SV650 Geometry fix

Those forks can be extended 10mm internally.
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Old 09-27-2019, 04:42 AM   #9
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Re: SV650 Geometry fix

Yes, as stated, going longer on the forks slightly, plus the 70 profile tyre will get my forks to stock length, but it won't fix the acute rake. Extending the forks isn't easy, as fork caps weren't sold for the k4 k5 gixxer as the forks had to be lifted in the clamps on the gixxer to better the geometry. Extending the forks is not a cost effective solution considering a small 10mm increase. I am not going to lower the rear, if anything I was going to go from stock to the zx10r swap and raise it a little bit as I'm cramped on the bike, especially after I put aftermarket rearsets on it.
No-one has mentioned extending the swingarm a lil bit, does anyone know a rough distance vs effect as a guide?
Thanks for your replies everyone, cheers.
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Old 09-27-2019, 08:10 AM   #10
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Re: SV650 Geometry fix

Quote:
Originally Posted by peso piuma 696 View Post
Yes, as stated, going longer on the forks slightly, plus the 70 profile tyre will get my forks to stock length, but it won't fix the acute rake. Extending the forks isn't easy, as fork caps weren't sold for the k4 k5 gixxer as the forks had to be lifted in the clamps on the gixxer to better the geometry. Extending the forks is not a cost effective solution considering a small 10mm increase. I am not going to lower the rear, if anything I was going to go from stock to the zx10r swap and raise it a little bit as I'm cramped on the bike, especially after I put aftermarket rearsets on it.
No-one has mentioned extending the swingarm a lil bit, does anyone know a rough distance vs effect as a guide?
Thanks for your replies everyone, cheers.
If the front end is at stock height, why do you think the rake changed? Short of cutting and rewelding the steering head to change the rake angle, the only thing that affects rake is ride height. (Both front and rear).

Trail is what you really need to be concerned about, rake is only important in as much as it affects trail. One problem with the GSXR swaps is that GSXR triples have more offset (how much more depends on year/model) and more offset reduces trail.
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