you have a long vinter in norvay...and you use the time for some great procjekts...
Thanks Annyone know what would bee the best fork oil. Tried 10w 40 fork oil but the forks feel to hard and the return is to slow? Annyone had the same trouble?
As with all oil threads, "best' is in the eyes of the beholder. 10W-30 is in many manuals. A little stiff for my taste. ATF is in many manuals. That's about 7-8w depending on the source. I like it. It also has stuff in it to make it seal and anti-foam friendly. I guess, who knows.
I'd use ATF as a starting point, and experiment from there. There are dedicated fork oils available from on line or cycle shops mostly in the dirt bike section, that vary the weight in small increments above 10, like 12, 15, etc.
Remember that in our old forks the oil plays little part in compression damping. Some, just because its there. The spring does most, like 95%, so if its too stiff its either the spring or live with it.
The oil dampens the rebound. Too much damping and the wheel won't follow rapid succession bumps. And it feels bad in the bumpies. Too much damping rebound can make the com presion side feel stiff. Imagine, the wheel goes up nicely, goes back down slowly. doesn't get fully set before it hits another bump. Compression now suffers, and the rebound is once again too slow. Com presion suffers again. You can actually suck the front end down each bump this scenario, building in more and more preload into the spring, causing it to feel stiffer and stiffer.