The setup is very similar to the 250; the back of the 125 pulley housing does the same job as the steel backplate on the 250. The backplate holds the oil seal in place, the E-clip pulls up lightly against the oil seal and stop the shaft from pulling out. Once the backplate is off, the shaft is (relatively) free to slide out. The amount of carbon deposit on the shaft/Valves will determine just how hard it is to get the shaft out.
I imagine the retaining nut (part 13) is left-hand (reverse) thread, so take care when removing it... many a 250 owner has broken an RC Valve shaft by inadvertantly tightening the nut when they think they are loosening it!
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Andy.
NSR-WORLD.COM
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