Hmm. Can't seem to find any guidelines on how to set the Preload on my RST Capa front fork. But trying to use common logic in it. This was what I did below.
p.s: Before following the steps below, remember that these steps were just something I thought up and should probably not be used as professional reference.
1 - I know that the fork had a maximum of 80mm travel. Meaning 80mm starting from the oil seal (indicated by the lower white line shown in the picture).
2 - Set the Preload adjuster to the hardest setting possible (keep turning towards the "+" sign until can't anymore)
Preload Adjuster
3 - Use a clean piece of tissue to wipe away the Oil Line (shown in yellow in the picture above). The oil line is the mark made by the oil seal as your fork gets compressed. It works as a good indicator of how far your fork travels up and down.
4 - Take your bike out for a ride, maybe do some jumps. Remember to get use to the bike and the suspension before doing any major jumps. Ideally try to do some jumps or hops which you would expect to go through on your trail ride. So that you can mimic trail riding as much as possible. When done, check on the Oil Line and see how far up your fork went. If your Oil Line is within 70~80% of your Travel (in this case 70~80% of 80mm) then you are good. If not, soften your forks by adjusting to the Preload towards the "-" direction and go again for a ride.
5 - Repeat until you find a compression percentage which you like. Remember that every trail would have it's own prefered setting, so every now and then, check on the Oil Line to see how far your fork compresses after each ride. If it reaches the maximum travel of your fork. Then it is probably too soft.
Alternatively, at step 2. You can adjust the preload setting to minus "-" instead and slowly work your way up. But I worry about bottoming out the forks, so I went with the "+" way instead.
Few days later, and I found an article on the correct way to setting your fork and shocks. Please view here instead. :p
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