My suspension tuner said the 65's need less sag than big bikes. Maybe 2-3"? But I run a lot on my little guys KTM 65 since he is 6 and only weighs 55 lbs.
Sag should be set at 1/3 total wheel travel. The KX65 has 9.45 inches (240mm) of travel, so 1/3 of that is 3 inches. 80mm as suggested by Walt/Factory Connection, is right on the mark.
2 inches, as suggested above, would be way too stiff, throwing the balance of the front/rear suspension off.
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