i have a yz125 and an 03 sx125, there is some difference in the pedal. One day after a clutch change in the yz, i left off the spring, accident of course, and i noticed a little better feel. I might try that with the sx. Or (scince i lost the original spring) i put on a very weak spring i found in the garage. I think its an govener spring off an honda pressure washer. It holds the pedel up, barely, and still has good feel. Try stuff!
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03 sx 125
00 yz 125