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Old 03-25-2014, 01:45 PM   #1
FZeno1 OP
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Joined: Oct 2010
Location: Grand Rapids, MI
Oddometer: 65
XR650L Big guy Suspension help

So here is the skinny(punn intended)

Annnnd I have indeed done a ton of searching this and other forums for an answer before I get the standard, "Use the search" Response

I have a 2001 XR650L I bought it towards the end of last season. I have so far enjoyed it but time to get serious cause spring is supposedly coming.

I am about 320-335 pounds without gear. (Depends if I ate like a Boa that day and have a whole pig in my belly) Yup, Thats not a typo I am of a big breed. Built like a linemen, But never stopped me from getting a knee to the pavement, or Roosting a Pal.

I have owned many bikes and have always resprung the suspension and even revalved a couple of my track bikes so I have a decent amount of expierience. Here is my problem...

So according to the Ractech spring rate calcuator I need

FRONT FORK SPRINGS
Recommended Fork Spring Rate: 0.588 kg/mm (use closest available)
Stock Fork Spring Rate: 0.44 kg/mm(stock)


REAR SHOCK SPRINGS
Recommended Shock Spring Rate: 16.2 kg/mm (use closest available)
Stock Shock Spring Rate: 10.5 kg/mm (stock)


http://www.racetech.com/

So here is the problem. In a couple different places such as racetech, http://www.xrsonly.com/, and http://www.procycle.us/ I can get a multitude of fork springs. Some as heavy rate as 8.0KG(Now that's a big Dude!) but the strongest shock spring I can find is 12.5KG Made by Eibach. Part#890.0125.1 Which I cannot find in stock anywhere.

So I have a tough call..I can either :
A. Buy the 12.5KG spring and buy the matching .50kg rate fork springs so the the bike is balanced and the bike is sprung 14% stronger then stock. But still very much undersprung for my weight.
B. Buy the correct front fork springs and get a 12.5KG shock spring and crank up the preload and have the bike out of balance.
Orrrrrrrrrr
C. Someone magically Share with me where I can get a stronger rear spring.

I have called racetech and no such luck. Called Cannon racecraft and they can custom make me a shock spring at a really really high Cost$$$$$. Annnnd I am not looking to buy a whole after market shock

Your thoughts?

In addition if someone has a rear shock spring laying around that they can give the the OD, ID, and length measurements that woudl be greatly appreciated so I can call traxxion dynamics to see if they can have something close. This really would helpful

AS you can see I am use to being a Gigantor on a bike and dealing with suspension, just never had thing many problems sourcing springs.

I am a pretty agresive rider that has expierience with dirt, pavement, track, and supermoto. So I am trying to avoid having the bike being really undersprung so that I don't get overconfident and wadd it up.

Thanks for the help

I have also posted this at TT but not really got a lot of response. So far a lot of guys have stated they are also looking for the same thing and are following my other post so this cannot be that rare of a BRP issue.

http://www.thumpertalk.com/topic/107...spension-help/
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Old 03-25-2014, 03:06 PM   #2
mcma111
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Not sure if you found this thread that covers the subject:

http://advrider.com/forums/showthrea...50l+suspension

Or you can do what I did. CRF450 forks and a custom made spring for the O'hlins shock. It's only money...
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Old 03-26-2014, 05:53 AM   #3
FZeno1 OP
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Quote:
Originally Posted by mcma111 View Post
Not sure if you found this thread that covers the subject:

http://advrider.com/forums/showthrea...50l+suspension

Or you can do what I did. CRF450 forks and a custom made spring for the O'hlins shock. It's only money...
I have not seen that thread yet thank you. But he is in the same place I am and spent the money on the cannon spring

"It's only money huh" then do you want to fund my inverted forks and ohlins transformation? hahahaha I am way too cheap for that
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2008 Aprilia SXV550 - 01 Yamaha FZ1 -- 02 KTM 520 exc -- 02 Yamaha R1 -- 09 Aprilia Dorsoduro- 04 Yamah RS Warrior --03 Yamaha WR450 w/ Supermoto -- 2000 Honda XR650L- 02 Kawi ZX12R
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Old 03-26-2014, 07:10 AM   #4
crypto666
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It seems to me that the racetech calculator often over-springs setups, or am I thinking of compression. Anyhow, they are on the stiff side.

How about running the tightest springs you can get, run higher PSI in the shock, and keep some pressure in the forks to compensate? Just a thought, and probably a bad one.

Don't go inverted on the forks until you have all the Klim gear to go with it and patches to show you are a world champion ADV rider.
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Old 03-26-2014, 01:45 PM   #5
FZeno1 OP
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Well I am in Luck...

I just called CannonRacecraft again

They recently lowered their prie on rear custom springs to $139.00 So I am ordering that up and can get myself all squared away.

Thanks
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2008 Aprilia SXV550 - 01 Yamaha FZ1 -- 02 KTM 520 exc -- 02 Yamaha R1 -- 09 Aprilia Dorsoduro- 04 Yamah RS Warrior --03 Yamaha WR450 w/ Supermoto -- 2000 Honda XR650L- 02 Kawi ZX12R
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Old 03-26-2014, 04:19 PM   #6
crypto666
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Quote:
Originally Posted by FZeno1 View Post
Well I am in Luck...

I just called CannonRacecraft again

They recently lowered their prie on rear custom springs to $139.00 So I am ordering that up and can get myself all squared away.

Thanks

Cool, sounds like a fair deal. IN fact, I am not sure my non-custom cannon was much cheaper.
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