Make sure all linkage and swing arm bearings are serviced and free from rust!!!
Setting your SAG is pretty simple and can be done with your friends in about 10 minutes or less.
It's the first starting point when getting your bike suspension tuned. The toughest part to setting your rear SAG is finding friends to help you and to be sure you do the math right.
Once you set the SAG accurately you can then begin adjusting your rebound and compression adjusters to get your bike perfectly dialled in and handling well.
Measurement A: First Measurement
Place the bike on a stand, wheels unweighted. If you do not own a SAG scale use a measuring tape. Use a piece of race tape and fix the end of the measuring tape to the rear fender so the same point is used everytime. Measure down to an accurate point on the rear axel nut. Record this as measurement A.
Have the rider gear up, remove the bike off the stand. Whilst one person holds the handle bars have the rider sit in a normal riding position and bounce on the seat to settle the bike. Record this measurement to the same point on the axel.
With the bike off the stand and the rider off the bike push down on the back end and let the bike come up by itself. Measure to the same point on the axel and record as C/1.
Now lift the rear of the bike and let it settle. Measure the same point to the axel and record as C/2.
Now add C/1 and C/2 together and divide by 2. This is your true and accurate measurement of C. If you have any more than 5mm between C/1 and C/2 chances are your linkages require servicing.
Bike SAG = A - C
635mm - 600mm = 35mm
Rider SAG = A - B
635mm - 530mm = 105mm