Good to see the old gray matter taking hold regarding drill hole diameters 
Although you guys are the first to get the emus, a gentleman in OZ previously contacted me via PMs about the mod (didn't know they sold the Fzs600 there). I am reproducing part of 'someonehappy' s correspondence with me, hopefully he won't object !
"Hi Kebab,
...I got the emulators installed.
it's a perfect fit to the damping rod.
I didn't get the chance to find a proper table drill so I ended up with just drilled two wholes, 10mm diameter.
I used 15wt castrol fork oil with about 120mm oil level.
The emulator preload spring is about 2 turns.
I didn't change anything else.
The initial feeling is quite strange. The low speed compression is quite high, which is not bad. But the small bumps on the road is hardly to be noticed which makes me feel a little bit lack of feeling. And it's a little bit too harsh when encountering real big bumps.
Then I did some change, I replace about half the oil to 10wt castrol fork oil to make it approximately 12.5 wt.
And I change the emulator preload spring to about 2.75 turns.
After these changes, the low speed compression is smaller, and still acceptable.
The feeling for small bumps is improved, but I felt the damping for big bumps is a little bit too small.
Then I did the another change.
I added about 10mm 10wt oil for each leg.
This improved the damping when hitting big bumps, seems no longer that easy to bottom up.
So my setup till now is roughly 12.5wt fork oil with 130mm oil level, and emulator preload spring is 2.75 turns.
I'm going to keep trying different settings to improve the feeling. It seems change oil level is really make some difference that you can feel, and it's quite easy to do. I'm going to withdraw about 5mm oil next time.
And I probably will change the rear shock and front spring later. I think stiffer spring could help to make it better.
In short, I think the improvement is very good, worth the money and effort.
Regards"
Looking at this report, I'm thinking that for Somonehappy, the 2 x 10mm holes he drilled just weren't quite enough, although with a lot of perseverance he still got what he felt was a decent result. I suspect that here the original compression circuit was still restricting the emulators from functioning fully.
If I was doing the mod again (and I am) I would consider starting either with four x 9mm holes, or the two lowest holes 10mm & the upper two either 9 or 9.5mm.
Regarding fork oil, apparently a lot of stuff is rounded up (or down) weight-wise. So oil that is 8w or 12w can be sold on as 10w. I *think* I remember reading somewhere that Yamalube oil weight values were quite close to what was on the label, although if your local dealer doesn't have any I guess you can go for other brands.
UPDATE: I have added a lot of updated pics to the Racetech / Debrix thread showing rods with lowest holes 10mm and upper holes 9.5mm
Although you guys are the first to get the emus, a gentleman in OZ previously contacted me via PMs about the mod (didn't know they sold the Fzs600 there). I am reproducing part of 'someonehappy' s correspondence with me, hopefully he won't object !
"Hi Kebab,
...I got the emulators installed.
it's a perfect fit to the damping rod.
I didn't get the chance to find a proper table drill so I ended up with just drilled two wholes, 10mm diameter.
I used 15wt castrol fork oil with about 120mm oil level.
The emulator preload spring is about 2 turns.
I didn't change anything else.
The initial feeling is quite strange. The low speed compression is quite high, which is not bad. But the small bumps on the road is hardly to be noticed which makes me feel a little bit lack of feeling. And it's a little bit too harsh when encountering real big bumps.
Then I did some change, I replace about half the oil to 10wt castrol fork oil to make it approximately 12.5 wt.
And I change the emulator preload spring to about 2.75 turns.
After these changes, the low speed compression is smaller, and still acceptable.
The feeling for small bumps is improved, but I felt the damping for big bumps is a little bit too small.
Then I did the another change.
I added about 10mm 10wt oil for each leg.
This improved the damping when hitting big bumps, seems no longer that easy to bottom up.
So my setup till now is roughly 12.5wt fork oil with 130mm oil level, and emulator preload spring is 2.75 turns.
I'm going to keep trying different settings to improve the feeling. It seems change oil level is really make some difference that you can feel, and it's quite easy to do. I'm going to withdraw about 5mm oil next time.
And I probably will change the rear shock and front spring later. I think stiffer spring could help to make it better.
In short, I think the improvement is very good, worth the money and effort.
Regards"
Looking at this report, I'm thinking that for Somonehappy, the 2 x 10mm holes he drilled just weren't quite enough, although with a lot of perseverance he still got what he felt was a decent result. I suspect that here the original compression circuit was still restricting the emulators from functioning fully.
If I was doing the mod again (and I am) I would consider starting either with four x 9mm holes, or the two lowest holes 10mm & the upper two either 9 or 9.5mm.
Regarding fork oil, apparently a lot of stuff is rounded up (or down) weight-wise. So oil that is 8w or 12w can be sold on as 10w. I *think* I remember reading somewhere that Yamalube oil weight values were quite close to what was on the label, although if your local dealer doesn't have any I guess you can go for other brands.
UPDATE: I have added a lot of updated pics to the Racetech / Debrix thread showing rods with lowest holes 10mm and upper holes 9.5mm