Two Stroke Motocross
Two Stroke Motocross Forum => Technical => Topic started by: Braap257 on July 29, 2010, 07:11:38 PM
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Im lookin to stiffen the rear shock a bit on my yz250. i heard it can be adjusted but how??? The front forks seem okay...
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There are 2 rings around the top of your rear shock tube, lossen the top one with a shock spanner wrench (or equivelent). Spin the lower one down to actually stiffen the rear spring, then spin the top one back down to it to 'lock' it. That is for a basic 'stiff' rear, that does not effect rebound damping.
Easy job, only takes a few minutes.
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Thanks, I'm gunna try playin with it and see what i can do.
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Powerplay is right. Really if it's too soft you should consider getting the proper springs and valving for your weight. Those compression nuts are really for setting your sag, if you crank them down a lot I bet your sag numbers will be way off.
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Where can i find new springs coop?
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race tech i think, they have a conversion chart to tell you what springs you need for your weight. If you check your ride height and stuff you will know whether the spring is too heavy or light for you.
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Sorry I forgot all about this thread.
Like Scotty said Race-tech. Or MX-Texh, Pro-Action, RG3, are a few more companies.
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You should measure your sag before you order a new spring.If you're no heftier than 170 or so you may be ok and may just need to crank up the compression a little.
Have you ever measured sag,bike sag and extended before?
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Motosport.com has Factory Connection springs, $90ish for fork springs, $110ish for rear.
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Ford, Yes I'm actually like 5'11 210lbs. and im workin on droppin about 15lbs. And no, Never measured the sag. How is it done?
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Just arrived at work >:(so I'll post it up later if someone else doesn't.Set close,even with your weight it won't be too bad.YZ's are quite tolerant.
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Ford, Yes I'm actually like 5'11 210lbs. and im workin on droppin about 15lbs. And no, Never measured the sag. How is it done?
Here ya go:
http://www.procircuit.com/installation_instructions/Setting%20the%20Sag.pdf (http://www.procircuit.com/installation_instructions/Setting%20the%20Sag.pdf)
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Ford, Yes I'm actually like 5'11 210lbs. and im workin on droppin about 15lbs. And no, Never measured the sag. How is it done?
Here ya go:
http://www.procircuit.com/installation_instructions/Setting%20the%20Sag.pdf (http://www.procircuit.com/installation_instructions/Setting%20the%20Sag.pdf)
Thanks Coop,
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No problem. That's a good article, the procedure is the same for your YZ.
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My apologies if clicker settings are covered in Coops links but I didn't look.Living in the boonies means I can ride from my back door-it also means I can't get high speed.Anyhoo,once you set the sag it's critical you set the clickers properly.I assume you have an owners manual?Someone before you may have adjusted them and have them way off.Yamaha's recommended settings are pretty darned close.My bro in law was about your weight and eventually went to a stiffer spring-BUT-for two years he rode stock and it worked very well.
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I'm pretty sure that article just covers static and race sag Ford.
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My apologies if clicker settings are covered in Coops links but I didn't look.Living in the boonies means I can ride from my back door-it also means I can't get high speed.Anyhoo,once you set the sag it's critical you set the clickers properly.I assume you have an owners manual?Someone before you may have adjusted them and have them way off.Yamaha's recommended settings are pretty darned close.My bro in law was about your weight and eventually went to a stiffer spring-BUT-for two years he rode stock and it worked very well.
*Update* Okay, So today I worked on getting my YZ's suspension dialed in for my weight, I'm starting with the shock then the forks. So today I tried setting the sag and got the exact results i figured i would get. First I adjusted the suspension to get the proper Race sag. I adjusted the shock until I got 4 inches of Race sag measuring from the middle of the back wheel to the rear fender. Then after that I checked Static sag. So I put the Bike on the stand and then put it on the ground and got little to no Static sag at all. So that means new spring with a higher spring rate. My question is How do i know which spring is right for me??? BTW I'm thinking of ordering a spring from MotoSport.
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Moto$$$$port :)
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Most sites have a spring calculator. Here's Race-Tech's:
2004 YZ250 Spring Calculator (http://old.racetech.com/evalving/SpringRateCalculation/dirtspring.asp?brand=Yamaha&yr=2004&ml=YZ250&formuse=form1&SpringType=Fork&bikeid=1653)
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Moto$$$$port :)
Whats that supposed to mean? ???
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Most sites have a spring calculator. Here's Race-Tech's:
2004 YZ250 Spring Calculator (http://old.racetech.com/evalving/SpringRateCalculation/dirtspring.asp?brand=Yamaha&yr=2004&ml=YZ250&formuse=form1&SpringType=Fork&bikeid=1653)
Coop, Do you think this calculator is accurate enough? And btw it takes me to a blank page... :(
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Moto$port is the Circuit City of motorcycle parts, generally things are 10x more expensive there. Maybe not all the time, but a lot of the time :)
I would see if Rocky Mountain ATV has the item also and how much they charge. They are generally cheaper and they ship very fast.
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I don't know about the whole "Things are 10x more expensive there" I mean. I just bought an Aluminum stand for 58 bucks. But am irritated to find out its back ordered and i most likely wont see it till September.. :(
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Coop, Do you think this calculator is accurate enough? And btw it takes me to a blank page... :(
I think it's close enough, and it works on my laptop and I tried it on my wife's Not sure why it's blank for you??
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Just brings up a blank page. Maybe you could put the info in for me and tell me what it says ;D
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Coop, Do you think this calculator is accurate enough? And btw it takes me to a blank page... :(
I think it's close enough, and it works on my laptop and I tried it on my wife's Not sure why it's blank for you??
+1 on accurate enough, I have used it for most of my bikes, and it is very good.
Most small suspension shops use the racetech calculator as well.
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Most good suspension shops would already know what rate spring suits your weight for that model, as they have probably already done a million before.
Another rough guide is to check your manual, it will tell you what rate spring is standard, and what weight rider that suits. So for 10 kgs you are over the standard weight add .2 kg to the standard spring rate.
Remember to add about 10kgs to you body weight to allow for your riding gear (or as in Jetz case, don't worry about it) ;)
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Most good suspension shops would already know what rate spring suits your weight for that model, as they have probably already done a million before.
Most Small shops only do a few bikes a week. Locally here in SoCal (where all of the good stuff happens) Racetech is the leader and the small shops use them for tech support and parts.
If you think a mom and pop shop has set up all bikes for riders from 100lbs to 300lbs you are dreaming. They use a calculator. Most of them use Racetech's calculator.
Why are you trying to lead this guy off course? You got nothing better to do?
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Most good suspension shops would already know what rate spring suits your weight for that model, as they have probably already done a million before.
Most Small shops only do a few bikes a week. Locally here in SoCal (where all of the good stuff happens) Racetech is the leader and the small shops use them for tech support and parts.
If you think a mom and pop shop has set up all bikes for riders from 100lbs to 300lbs you are dreaming. They use a calculator. Most of them use Racetech's calculator.
Why are you trying to lead this guy off course? You got nothing better to do?
What????
Where in my post did I say anything about small or Mom and Pop shops ???
In fact it says "Most good suspension shops" ie Race Tech, RG3, Pro Circuit.
Leading this guy off course ? Noting better to do ?
Stay of the weed, whilst posting on a forum pal.
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Just brings up a blank page. Maybe you could put the info in for me and tell me what it says ;D
Try this. Go here and enter you bike info and it will take you to the calculator I posted.
http://old.racetech.com/evalving/menu/searchdirt.asp (http://old.racetech.com/evalving/menu/searchdirt.asp)
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Just brings up a blank page. Maybe you could put the info in for me and tell me what it says ;D
Try this. Go here and enter you bike info and it will take you to the calculator I posted.
http://old.racetech.com/evalving/menu/searchdirt.asp (http://old.racetech.com/evalving/menu/searchdirt.asp)
Okay it worked that time, Thanks Coop.
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Okay it says The stock spring for my bike is 4.7 kg/mm. And it recommends a 5.28 kg/mm for me. Does that sound about right?
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Yep. I did the spring calculator also on MX-Tec's site and it said stock was 4.7 and they recommended a 5.0, that was using 210, not sure what weight you used at Race Tech.
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i put an extra 10lbs for gear.. Even though it says without gear. I dont want get a spring thats too soft.
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i put an extra 10lbs for gear.. Even though it says without gear. I dont want get a spring thats too soft.
I don't add any weight for gear, and Racetech is on the stiff side. I use 210 for my base line and I fluctuate from 210-225 without gear.
Unlike some of my brothers here, I wear a lot of gear :D
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Well I'm gunna be wearing Helmet, goggles, boots , Jersey and Pants, oh and gloves ;D
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Gear is important. I just got the nephew that lives here with us that rides the CR80 some of that armor that's a jacket style, with the chest, back, shoulders and elbow cups plus kidney belt. I wouldn't mind having one of those for myself now.
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I see you decided not to take the JETZ route ;D
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Haha yeah I don't agree with the theory that kids ride more reckless with gear. :)