sag

[peezy]

So i decided to set up my suspension, since last time i was riding my back end was bouncing everywhere.

So from a guide online, i came up with these numbers.

a= bike on stand
b= bike off stand, with rider
c= bike off stand, no rider

a= 635mm
b= 536.70
c= 622.3

so my race sag is = 98.3 and my static is 12?

does this mean i need a new spring? or should i try to re-charge my shock, and make sure its not blown? as my friend once told me it was..

any help, tips, advice would be great.

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[TecateRay]

So i decided to set up my suspension, since last time i was riding my back end was bouncing everywhere.

So from a guide online, i came up with these numbers.

a= bike on stand
b= bike off stand, with rider
c= bike off stand, no rider

a= 635mm
b= 536.70
c= 622.3
so my race sag is = 98.3 and my static is 12?
does this mean i need a new spring? or should i try to re-charge my shock, and make sure its not blown? as my friend once told me it was..

any help, tips, advice would be great.

Sounds like your sag is pretty close. You don't mention the make or model of bike, but 100 mm is pretty common. Have you tried the "clickers" on the shock to see if it makes any difference? If they don't, your shock probably needs to be serviced or rebuilt

[peezy]

sorry for not posting the other information. It is a 2003 yz250f, i am about 5' 9" and about 160 pounds.

i put all the clickers back to stock, ie: compression, rebound, hs compression.

i think there is something wrong with my shock, when my bike is just sitting there and i use my hands push on the rear fender, i can compress the bike pretty easy with out a lot of force.

should i take the shock off and take it in? maybe it just needs to be re-charged?

[TecateRay]

sorry for not posting the other information. It is a 2003 yz250f, i am about 5' 9" and about 160 pounds.

i put all the clickers back to stock, ie: compression, rebound, hs compression.

i think there is something wrong with my shock, when my bike is just sitting there and i use my hands push on the rear fender, i can compress the bike pretty easy with out a lot of force.

should i take the shock off and take it in? maybe it just needs to be re-charged?

Your bike is almost ten years old, so my guess is that a shock rebuild is in order. Hopefully it will just need an "oil change", new seals and then a new nitrogen charge. If any of the major parts are worn beyond specs it may cost a bit more. Call around to get some estimates, there are lots of folks who do quality suspension work. Just think how much more fun riding will be if the rear end isn't tossing you all over the place. Might save you a trip to the hospital as well.

[peezy]

i was thinking of doing it my self, and just taking it in to get it charged. Motor world wants like 86 plus parts. is this something i can do on my own? i already have rebuilt my engine, and the last think i need to learn is my shock. every where else wants like 100+ and they don't recharge the nitrogen ;/

[MXShea]

To get the correct sag you need to be adjusting your preload...there are spring preload wrenches or you can use a hammer and a punch (carefully). You need to set the sag before you mess with (and seperately) from your compression damping and rebound clickers.
If the rear end is "bouncing around", the rebound is more than likely too fast. If slowing down the rebound doesn't seem to do anything then have your shock serviced. Has it always been this way? Or is this a new problem...

If it's always been this way...the stock set up on these are a PITA. The fork springs and valving are too soft making the front end ride low in the stroke. The rear is just the opposite, rides too high in the stroke. I had to get stiffer fork springs and valving set up and lower the rear with a spacer in the shock. There's also a linkage arm but it's expensive. Stiffening the front and lowering the rear helped the stability. Do your best to do that and it will help.
Factory Connection is a good place to send it off to BTW.

[peezy]

it kinda has been a new problem i have been noticing more and more. i use to be able to go over the whoops at a decent speed. but now my back end likes to hop around way more. just now every time i do ride, i feel like i have less control then i did before.

what i did was adjusted the clickers to stock, and then set race sag to 98mm and my static sag came out to be 12mm, witch i read someone on thumpertalk it needs to be between 25-45mm so it would mean i need a stiffer spring?

my idea is since its 10 years old like ray said, it wont hurt putting new oil into it.

i don't want to spend a arm in the leg for labor, so would servicing it my self be a big problem? or just stay away from it? I am pretty good at teaching my self new things as i did with rebuilding my engine.

[cosmo]

Nitrogen should be (app.) 150 psi. Try adjusting the slow comp. adj. Try two clicks at a time. Any bike shop should be able to check the gas pressure,or a good off road (buggy/truck) shop. Usually about $10.00.

[peezy]

thanks for all the help. i think i will change the oil my self, and then just get it charged and take it from there.