I’ve had the KTM RC390 from almost new, and it’s been an outstanding bike even if it has a few quirks…
The fork seals started leaking about 1000km ago (800 miles), so I replaced them with whatever I could get in the middle of a lockdown. This meant getting some cheap ones online, sight unseen.
It was only when I pulled the bike apart to replace them that I found that the replacement dust seals were the wrong size! This meant reusing the old dust seals again.
I used 425mls of oil (7W) in each fork, instead of the standard 450ml (4W). Less oil gives it less compression damping, and a thicker oil gives more rebound damping.
This improved the handling quite a lot, and made the front end feel really planted.
Alas, those cheap seals didn’t last long, and one of them let go while cranked over in a corner, which means I’ve had to replace them again.
I was intending to sit on this job, and leave it for, if and when I end up self-isolating for Omicron (yes I know that is insane, but I live in NZ, and they took the blue pill).
However, circumstances have changed, and I need the bike available for travelling to Wellington.
(Luckily I already had some replacement SKF brand seals, which I had brought between the lockdowns.)
It took me @ 5 hours hours to take all the fairings off, jack up the bike, remove the front wheel, and remove the forks to get to the seals, and then put it all back together again.
So it’s all back together again for the next adventure…
Uncoffined 
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