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Old 01-06-2011, 04:00 PM   #1
Chubby Racer
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tard suspension

I just picked up a SXV550, and want to know how to spring this for the track. There seems to be a fair amount of front end dive on the brakes. Is there any way to eliminate this, and still keep the suspension pliable for hitting jumps?
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Old 01-06-2011, 04:06 PM   #2
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Sweet bike, congrats dude!

I'll let one of the suspension guru's chime in on this one.
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Old 01-06-2011, 04:11 PM   #3
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I don't know much about the supermoto suspension set ups but for starters, you may need a stiffer set of springs up front and in the back.
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Old 01-06-2011, 04:19 PM   #4
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I don't know much about the supermoto suspension set ups but for starters, you may need a stiffer set of springs up front and in the back.
Call Hutch at SCRC.

281 703 0296

He's got Ohlins and I *hear* he's got RaceTech coming too...
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Old 01-06-2011, 04:32 PM   #5
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We can get your bike sorted for you.
We've got a lot of experience on the Aprilia.
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Old 01-06-2011, 04:36 PM   #6
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<- jealous
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Old 01-06-2011, 04:36 PM   #7
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Quote:
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We can get your bike sorted for you.
We've got a lot of experience on the Aprilia.

Almost forgot that Scott has a 550..
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Old 01-06-2011, 04:39 PM   #8
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I am too. I rode it yesterday and that thing is a beast. It is most definitely Italian, but all is forgiven the second you twist that throttle. It made me realize that I could never have a street legal tard as the words "license suspended" flashed across my mind everytime the front wheel came up.
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Old 01-06-2011, 05:32 PM   #9
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Quote:
Originally Posted by Patrick View Post
We can get your bike sorted for you.
We've got a lot of experience on the Aprilia.
+This+

keep the power to the ground
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Old 01-06-2011, 07:53 PM   #10
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Quote:
Originally Posted by smokinjoe View Post
+This+

keep the power to the ground
keeping the power to the ground is easy. Keeping the front wheel to the ground is a whole 'nother tale.
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Old 01-06-2011, 08:15 PM   #11
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Check the AF1 forum. They have a very substantial section on the SXV's.

http://www.apriliaforum.com/forums/f...splay.php?f=50
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Old 01-06-2011, 09:35 PM   #12
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Fun bike. Makes your hands go numb at street speeds, and short gas range. Track makes it all go away, and makes you smile.

You luckily have great choices for suspension gurus. Motorcycles Unlimited, John H, Andy at Metric, and of course AF-1 in New Braunfels. All good people.

Suspension science is all Greek to me, some sort of Black Magic hoodoo voodoo stuff. Mongo confused.


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Old 01-06-2011, 10:28 PM   #13
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you need to be realistic with yourself and what you really want out of that kick machine of yours! If it will see 95% street and 5% offroad, set it up with a little more street orientation. If it will see a lot more airtime than that, keep it kinda soft and learn to live with it on the streets. In all reality it's a dirtbike front end, even if it's set up for mostly track use, it'll still handle the offroad stuff just fine IMO.
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Old 01-06-2011, 11:29 PM   #14
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I don't know if this is your first tard or not so I may be telling you something you already know, but if it is you are experiencing what I did a few months back when I bought my first one. The front end dive shouldn't be too excessive but it dives a lot further than sportbikes. You've got 12" of suspension vs. 4". Even thought the suspension is stiffer than a full off road suspension, I think it's pretty much standard operating procedure on these. Takes some getting used to. Couldn't hurt to have someone tweak it, but the bike moves around a lot compared to a sportbike. Wiggles, a little head shake, front end dive, etc. I don't know if it is as bad on the twin cylinder SXV but on the Husky I got the compression braking takes some serious getting used to. My tuono had a lot of it but this Husky has even more.
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Old 01-07-2011, 10:48 AM   #15
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Quote:
Originally Posted by brandontx View Post
I don't know if this is your first tard or not so I may be telling you something you already know, but if it is you are experiencing what I did a few months back when I bought my first one. The front end dive shouldn't be too excessive but it dives a lot further than sportbikes. You've got 12" of suspension vs. 4". Even thought the suspension is stiffer than a full off road suspension, I think it's pretty much standard operating procedure on these. Takes some getting used to. Couldn't hurt to have someone tweak it, but the bike moves around a lot compared to a sportbike. Wiggles, a little head shake, front end dive, etc. I don't know if it is as bad on the twin cylinder SXV but on the Husky I got the compression braking takes some serious getting used to. My tuono had a lot of it but this Husky has even more.
This is my first tard, but not my first twin. The compression braking is minimal compared to my RSV.
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Old 01-07-2011, 01:37 PM   #16
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Watching the pro supermoto guys race, it seems their bikes dive just as much as a regular dirt bike.
I don't think there is a way around it if you want to keep it plush enough to handle jumps.
My bike dives quite a bit, but not as bad as after we put shorter springs and re-valved it.
You just learn to ride around it. Not a big deal once you get used to it.
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Old 01-07-2011, 01:46 PM   #17
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I'd have a little tuning done then just ride it for a bit to see if you can accomodate, like others have said.
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Old 01-07-2011, 01:58 PM   #18
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Quote:
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I just picked up a SXV550, and want to know how to spring this for the track. There seems to be a fair amount of front end dive on the brakes. Is there any way to eliminate this, and still keep the suspension pliable for hitting jumps?
So many questions buried in your simple inquiry. You should call Ted or Jon at AF1 and be done with it. Simple. But before that, I'd ride it and tune around it to get a good baseline. Not sure where you've been with it yet, but up and down a street doesn't usually paint a very good picture.

By the way, I have raced both Ted and Jon's 550s. I liked Jon's better - it was sprung stiffer - which was more to suited to riding style. Everyone is different, though. In the meantime, I know where I'll start with my own 550 when I take delivery of it next month.
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Old 01-07-2011, 02:21 PM   #19
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Thanks guys. I guess I'll do one trackday first.
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