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It costs too much to drill two holes, thread them and plug them with screws.
Aside from my 1991 BMW R100GS with Marzocchi forks, none of the bikes I've owned over the past several years have come with drain screws on the fork sliders. All of them have required removing the fork tubes, taking the springs out of them, and pumping them over a catch bucket until all the fork oil has been pumped out. What a PIA!What happened to these handy little fork oil drain plugs?
On my EV, I have just pulled the axle, taken the large bolt in the bottom out, pumped he fork tube, it is empty. Not much need of a drain screw.But, that still leaves a lot of sediment inside the tube that has snuck past the seal. You need to disassemble them to get to that.
My approach is to remove fork cap, pull the fork leg, invert to for a few minutes to drain the fork oil, then add a couple hundred cc of kerosene to the fork leg, replace cap, invert several times and drain. If the kerosene is not crystal clear, repeat again as needed.
I had several bikes in the distant past with the drain screws. After 2 or 3 removals to drain the oil, the threads on the aluminum sliders would strip out and I just ended up epoxying the holes and not messing with changing the oil again.
That’s exactly what I do every 20,000 k.Been changed 9 times and due again soon.Bike is still on original fork seals.