Rider sag

[Gaz66]

Many thanks unfazed

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Hey Gaz66,does the r6 shock have to be drilled out to fit the fazer thou?

3 options that I'm aware of to date that are known to work:

Yrs ago these were plentiful new/cheap on eBay, R6 was a much sort after track/race bike.

1) From memory (2017) R6 shock with ramped preload ring, 2x1mm stainless washers & drill top bush 130mm x2 dog bones.
Fazers top bolt won't fit R6 bush, bush needs drilling to suit, new bit & drill slowly using lots of water, cook it, you'll spin the centre then you're up shit creak, there will be a bush that'll fit, but not from Yamaha, use a pillar type drill if poss, drill half way from both sides to keep drill centered, add a 1mm thick stainless washer either side of R6 bush to pack it out to in frame (swear box required) some glue washers to shock bush, I used battery drill & no glue, I like a challenge.
Bottom end needs no mods, just dog bone length changes to get ride height back, 130mm centres if memory serves?
Don't tighten top bolt up fully until bike's sat on it's tyres, bottom end's on bearings so u can tighten all these regardless.
Using thicker OEM bolt is a wise move, Fazer's way heavier than an R6, plus Fazer will potentially have a heftier rider/pillion combo.
I pre-bought a selection of used K-tech springs to play around with if required.
I'm 17st in full gear, OEM R6 spring is fine, preload set to 2 from max.

This R6 shock with ramped pre-load adjuster, you'll need to file off a few mill from the hump on top casting, it catches the FZS1000 frame rail above it, top bush rubber is rock hard, all bushes need room to flex, 5mm is plenty.
Be aware, OEM top shock bolt will be tight, pre-soak with penetrating fluid days before, bolt head's self locking in frame, 6 sided socket on a wobble drive works best, nut is a bit offset, it's doable with a U/J but u risk slipping & scratching frame, plenty of masking tape if you value your frames paint.
By all means do your own research 1st, all the above is from my now 60yr old memory, I never wrote it down, which looking back, I should have.

2) R6 shock with threaded preload rings, I believe these are 2018/2019 shocks? 
These came available after I did mine, personally I'd choose this shock over the ramped version, I believe all dimensions are the same, spring too, never had one to confirm measurements so I don't know if it'll need filing like the earlier R6 shock? do your own research 1st.

3) Certain S1000RR shocks will fit apparently, spring will be no use unless you weigh 10st, some fit step down bushes to use BMW top bolt, I believe this is done on the R6 too, due to Fazers weight, personally I'd rather use OEM heavier bolt & drill the bush.
Be mindful that using any shock designed for a lighter bike will very likely require rebound shim stack sorting to control a heavier load & spring, approx £100 from a suspension specialist for dyno/strip/mod shim stack/rebuild/top up oil/regas/dyno etc.