Are there any recommendations for fork oil viscosity?
The Gospel According to Honda says 5W, but I’ve read that 10W makes the front end a bit firmer, especially with Bibendum (ie me) on it.
Also, for various reasons I’m convinced that there’s next to no oil in them currently, so is there a figure for the oil volume required if it’s a drain and refil rather than a complete refill after a strip down?
I’m asking because I’ve seen conflicting answers on other sites, so I’d prefer the opinions of you experts on this site.
The left drain is at the base of the antidive unit on the rear of the fork.
10wt oil will certainly help with the bottoming out problem,as you have done your static sag already I would try the heavier oil first before changing anything else
If the forks are bottoming out I would strip them and make sure the valving is assembled correctly. On 3 of 3 sets of R forks ive stripped, the valving was assembled wrong. Felt like there was no oil in the fork legs.