The unofficial Z900 suspension tuning overview

[zed9]

Hi Jamie, it's Mark. I was the first to send a z900 suspension to you a few years ago. I never did touch any of the adjustments you pre-set for me as they were perfect.
I added a set of Continental Road Attack 3 tires and now have a bike I'll never be able to outride. The only thing that needs improvement is ME.
Still working on it.
Happy and healthy New Year to you and yours. 🍻

[kevperro]

I figured I'd update the info here because I referenced this for getting my suspension work done.

The 2017-2019 OEM fork spring rate is actually around 0.9 kg/mm.     It was actually about perfect for my weight (162 lbs. without gear).   

Jamie did change my rear spring to a 650 lb/in and re-valved both front and rear along with swapping out my bent fork tubes for a very reasonable price.   

Great service..... I'll update my impressions once I'm riding again.   

[zed9]

Originally Posted by kevperro

I figured I'd update the info here because I referenced this for getting my suspension work done.

The 2017-2019 OEM fork spring rate is actually around 0.9 kg/mm.     It was actually about perfect for my weight (162 lbs. without gear).   

Jamie did change my rear spring to a 650 lb/in and re-valved both front and rear along with swapping out my bent fork tubes for a very reasonable price.   

Great service..... I'll update my impressions once I'm riding again.

He does very nice work.
There’s no need of super high end suspension components unless you have the skills to exploit them. Few have those skills. Some do but not me, and I’m not alone.

[kevperro]

Originally Posted by zed9

He does very nice work.
There’s no need of super high end suspension components unless you have the skills to exploit them. Few have those skills. Some do but not me, and I’m not alone.

Well...I'm certainly not in the knee-dragger category nor do I want a bike set-up for that.   My explicit instructions were that I ride on the street and mostly at sane speeds.   I have no desire to trade off my 95% use for a 5% desire although I am hoping to do one track event this year.   It is more of a safety/skills class than a "how fast can I go" class.   

Just to put this in easy-to-understand terms with units that were used to start this thread. 

Stock OEM Fork Spring Rate:   0.9 kg/mm
Stock OEM Shock Spring Rate:   500-550 kg/mm (was not confirmed by Jamie so this info is based upon the earlier presented info)

[kevperro]

Having spent some time on my upgraded suspension, I'm 100% thrilled with it.    The bike just behaves totally predictably and is very manageable over bumps and imperfections in the road.   It is firm enough to inspire confidence when hitting corners and braking hard yet I don't feel beat up on bad roads.   

I'll add my recommendation for James Daugherty.   He was a pleasure to deal with an the results are superb.