Anyone get inconsistent race sag numbers?

Johndeere506
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274
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2/24/2017
Location
Fenton, MI, USA
Im trying put the time in to set my suspension up properly, but im getting inconsistent measurements on race sag. I think I'm just not sitting in the exact same spot everytime, at least thats all that makes sense to me. Im about 205 and trying to get my base setup on my CRF, and it just seems like my race sag numbers are back and forth even without changing preload. Im measuring from axle hole to the seam of the side panel and rear fender. If I move my weight even 1 inch back on the seat the number is way different. Ive read not to stand up, so Im sitting where i ride up front on the seat.
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ML512
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Wildomar, CA, USA
Fantasy
4/8/2019 10:24am Edited Date/Time 4/8/2019 10:26am
How level the ground you are in effects it and where you sit. Here’s the thing, the number isn’t magic. The number only really matters if you like it/it works for you. Some people say don’t stand up but I know other suspension guys who live by it because as a ride you can stand up straight without your hands on the bars (you need another person to hold the bike of course) and now you’re in spot where you can’t effect the balance or weight distribution as easily.

To see how the standing number coincides to what you’re used to, check your sag sitting in your normal position (if that’s a sag number you’re happy with) and then compare it to your standing number. Then you can use that number as your base.

When standing, don’t grip the bike with your legs, just contact the bike through the pegs and leave your legs loose /away from the bike.

Personally I don’t stand myself often, but I’m pretty good about sitting in the same spot everytime but I have recommended standing to riders that struggle.

A couple years back I was working with a Supercross rider and I changed his shock preload without explaining what I was doing. He went out, ride and liked the balance/change. He then asked me what I did and I explained. Once the shock cooled we checked the sag and it was 101-102ish. He freaked out because that was “stinkbug” but that was never apart of his original comments. He was convinced that the number was just too high because he had always run 104-106...so he changed it back...
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aees
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4/8/2019 11:23am Edited Date/Time 4/8/2019 11:25am
Check so the rear frame bolts are not loose. Also if you have a linkage that are done you will get different results.

I use a moto slacker digital scale. Sag for me basically never varies unless something is busted up.

With the Moto slacker I get constant numbers on race sag, that was an issue before with friends measuring slightly different.

Now I never look at the digital display before I'm properly seated, and I can go on and off 5 times without it differing. I use also static more then race sag, and unless I change weight I don't check race sag. Otherwise only static sag.
4/8/2019 11:32am
It's hard to get the exact same within 1-2mm

I measure 5 times and take the average...as there is some stiction involved - body position, shock nitrogen temp plays a role adn fluid temp - a cold shock fluid (and nitro) measure diff than hot.

I also suggest the riding bouncing a few times on the bike to get the shock to settle in it's happy place.

I suggest the stand up method with hands off the bars and rider straight up and down (have to trust your bike holder assisstant) hands by their side

It takes a host of variables out
4/8/2019 11:34am
and ML is correct

Run the sag that works best - not what your told to. Depending on the valving and clicker settings, spring rates, fork height, rider style and body positioning - no two riders will like the exact same same number if tested blind on a set bike.

When the 14 yz450f came out we found it worked best with the forks way up in the clamps adn sag 100 or 98

People called me crazy and then fast forward to 17 and it was pretty common for all places to do it. But we just went off feedback and didn't go off numbers - and that worked for us

The Shop

4/8/2019 11:52am
and ML is correct Run the sag that works best - not what your told to. Depending on the valving and clicker settings, spring rates, fork...
and ML is correct

Run the sag that works best - not what your told to. Depending on the valving and clicker settings, spring rates, fork height, rider style and body positioning - no two riders will like the exact same same number if tested blind on a set bike.

When the 14 yz450f came out we found it worked best with the forks way up in the clamps adn sag 100 or 98

People called me crazy and then fast forward to 17 and it was pretty common for all places to do it. But we just went off feedback and didn't go off numbers - and that worked for us
That's exactly how I ran it on my 14. Forks slid up a ways, more than I ever normally would, Enzo added the lowering plate in the shock and recommended 100mm of sag. It handled and turned pretty good!

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