setting race sag on 2003 kx 250

str8ripin
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str8ripin
Edited Date/Time 6/25/2014 2:02pm
I have a 2003 KX 250 and I need to set the sag on it. Can someone please tell me the Spec it needs to be between. I have the Service Manual but im not sure which numbers are correct.
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Paw Paw 271
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Paw Paw 271 6/25/2014 8:49am
6/25/2014 8:49am
As a rule of thumb the race sag should be between 100 and 105 mm. The bigger issue is after setting the proper race sag is to measure the static or free sag. That will tell you if your are sprung correctly. If that number is too big then the suspension will feel harsh and loose traction on acceleration and in stutter bumps. That number should be about 25mm.

Paw Paw
str8ripin
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str8ripin 6/25/2014 11:13am
6/25/2014 11:13am
Paw Paw 271 wrote:
As a rule of thumb the race sag should be between 100 and 105 mm. The bigger issue is after setting the proper race sag is...
As a rule of thumb the race sag should be between 100 and 105 mm. The bigger issue is after setting the proper race sag is to measure the static or free sag. That will tell you if your are sprung correctly. If that number is too big then the suspension will feel harsh and loose traction on acceleration and in stutter bumps. That number should be about 25mm.

Paw Paw
Isnt the way you get race sag is by measuring static measurment and then your weight on bike. & take the difference?
Mr Bean
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Mr Bean 6/25/2014 2:02pm
6/25/2014 2:02pm
str8ripin wrote:
Isnt the way you get race sag is by measuring static measurment and then your weight on bike. & take the difference?
No, race sag is the difference between the laden and unladen (on a stand, wheels off the ground) measurements.

What Paw Paw is referring to is the static sag. Too much indicates the spring is too stiff; too little means it's too soft. The rule of thumb I've seen is it needs to be in the 25-35mm range.

But remember, so much of suspension is personal preference, so don't get stuck on a number as being written stone. Use it as a guideline and experiment to learn what you like and don't like (and how the changes affect the performance).

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