I hit 10 000km on my gen4 cx last week (in 1,5 year),it was getting bit noisier on the rough stuff, i decided to open it up, and re grease it. Looks like it got a little bit water ingress. Didn't took any picture afterwards, but I used a hefty amount Motorex white grease on the cogs, and the clunking noise is barely noticeable anymore. Also replaced the bearing protection rings.
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Since i bought the used Kenevo, i felt the overrun was inconsistent, and too long in Turbo mode, ordered new sprag bearings, and replaced them. It feels pretty normal now.
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