ballbearian
Veteran Member
Good info that I could use on the Betor forks on the HD SS175, if I ever get to that project.It doesn't really matter as oil should always be above level of the hole.
If you really want to orientate it though, have it towards back of slider because angle of forks will make sure it's 'further down' into oil.
Honda doesn't give a spec but I tend to do oil level from top of tube, springs out fork compressed.
Start at 5.5" then remove oil half inch at a time to where it feels best.
On some bikes (older Triumph's and many MX) you will often end up around 7".
Before I had a fork oil height gauge, I used a syringe and small diameter tube (pretty much what the oil gauge is except it's stainless tube marked in inches and mm)
The higher the oil level, the less air is in forks so it acts as a rising rate spring (something very few people ever think about or even realise)
These are still assembled tubes, springs and damper rods. Just the one bottom allen bolt holds the whole shebang together (pic on post #338 above). Not sure I want to uncork these springs from the damper rods