• 2 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     WR = 2st Enduro & CR = 2st Cross

  • Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

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125-200cc CR125 spring rate question

flyingbob

flyingbob

Administrator
Going to put my son on a 2012 125 and he only weighs 120 lbs. So, does anyone here have a recommendation on spring rates? Thanks.
 
I'm thinking stock will be about right. If it's for offroad people have been unhappy with the forks but for MX they work pretty darn good stock maybe a tad soft (I weigh 155). Let the static and race sag #'s guide you on the shock spring.
 
On my bike, I get Vinduro's sag numbers with the stock fork springs and a 6.3 rear spring. I weigh 215. I was thinking stock shock spring might get him there, but the forks have to need a lighter rate. It's for offroad use. Thanks.
 
flyingbob said:
On my bike, I get Vinduro's sag numbers with the stock fork springs and a 6.3 rear spring. I weigh 215. I was thinking stock shock spring might get him there, but the forks have to need a lighter rate. It's for offroad use. Thanks.
Click to expand...


didi i read that right? 6.2**************************************** I am 195 woods rider and 5.4 is perfect for me
 
This is from Vinduro's set up thread. Must be a difference in bike geometry.

I weigh about 180lbs neked. I am using a .40kg fork spring and a 6.0kg shock spring. That is on my 2011 WR150. Stock fork springs are .42kg.
Stock shock spring is 5.0kg. Hall's installed a 5.4 spring when they serviced my bike. It wasn't close. I had little to NO static sag. Hall's was great about working with me and exchanging springs ( I didn't ride with them till I had the correct one). My fork sag stock wasn't nearly enough. I went down to a .40 and got 40mm static and 75mm rider sag.... PERFECT ! On the rear I was baffled as I kept going up. Jay Hall did take out about 25% of the high speed compression valving. Barely enough. Jay weighs 215lbs and says he uses a 6.8kg. spring. I think that maybe a bit much but I don't know what his sags are. When I got up to 6kg my sags worked out perfect. 30mm static and 101mm rider sag. I don't know what the leverage ratio is on the old frame vs the new frame. But my bike handles SO good, I can hardly believe it. Turns on a dime. Is stable and the front end sticks like glue. You may need to cut a new preload spacer for the forks . It is BELOW the spring. I used a paint stir stick to get it out. Get a PVC Heavy wall to cut new spacer out of if needed.
 
flyingbob said:
Yes. I wonder if there are any linkage/swingarm differences between the 2004 and 2012...
Click to expand...


I ran a 5.4 on my 09 as well, was perfect. I think Vinduro like the stink bug affect (high int he rear) for the tight eastern woods. I also found .44 to be perfect for the front for me. To each his own.
 
Is it a CR or a WR? For clarity the 2012 CR has .43 springs, in KYB 48 twinchambers, stock.
edit: ok duh it's in the title.....

IMO you can't follow any sag formula for front forks. It's a completely different animal. Different operating principle, added burden of braking forces, different force vectors, way more seal surface area and drag and blah blah.

Anyway I think the best way to get there is off your own experience. If you like the .43's in your 2012 CR165 and want his bike to work similar without KNOWING from someone who's done it, I'd do this....

We'll say the bike is 215 and you weigh 215. 430 lbs on 0.43 springs. Kid's bike and body go 335 lbs. He's 78% of your weight , 22% difference. 11 % of which we'll say the fork is responsible for. .43 times .11 gives you .047. So Run .38's or .40's .
 
MotoMarc36 said:
Is it a CR or a WR? For clarity the 2012 CR has .43 springs, in KYB 48 twinchambers, stock.
edit: ok duh it's in the title.....

IMO you can't follow any sag formula for front forks. It's a completely different animal. Different operating principle, added burden of braking forces, different force vectors, way more seal surface area and drag and blah blah.

Anyway I think the best way to get there is off your own experience. If you like the .43's in your 2012 CR165 and want his bike to work similar without KNOWING from someone who's done it, I'd do this....

We'll say the bike is 215 and you weigh 215. 430 lbs on 0.43 springs. Kid's bike and body go 335 lbs. He's 78% of your weight , 22% difference. 11 % of which we'll say the fork is responsible for. .43 times .11 gives you .047. So Run .38's or .40's .
Click to expand...
We'll start there! Thanks for the effort!
 
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