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Offline DaveySprocket

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z900 on track
on: January 04, 2021, 08:51:52 AM
Anyone race the z900 or tackle the suspension. So many comments on the z900 forum but I'm just as confused as I was when I started.. Basically I've set the sag and tried to dial in the rebound but I dont really know what I'm doing.. given the state of my rear tyre after the track school I'm sure a drastic change in tyre pressure is required.. but according to Dave Moss.. rebound might also be a problem. (rear rebound too fast - See raised edges on tread.) Ps. I'm around 90kgs kitted..


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Re: z900 on track
Reply #1 on: January 04, 2021, 01:33:35 PM
It does look like too much tire pressure. But you never mentioned what it is so....  :027: (cold and hot)

You are also not using enough of the tire and possibly too hard on gas early. Again, high psi will contribute to it if all other areas are set correctly. lastly, lay it down last 40-degrees  :192:

Offline DaveySprocket

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Re: z900 on track
Reply #2 on: January 05, 2021, 01:45:45 AM
Running Michelin power 5's start of day cold at 30 psi front and rear... didn't check hot.. will confirm next track day.

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Re: z900 on track
Reply #3 on: January 05, 2021, 03:31:17 AM
That's actually lower psi than I was expecting you to say. No longer sounds like a PSI issue.

So yeah, if re-bound is very fast, the tire will beat itself. Just make the rear return slower with the adjustment screw.

Online 3alfa3

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Re: z900 on track
Reply #4 on: January 05, 2021, 02:22:34 PM
You're coasting in leans (no acceleration, maybe even losing speed) , and  strong on throttle when almost straight. This kind of wear is typical for street riding, but yes, rebound is probably  too fast (sipes wear and debris on sipes trailing edge). Different riding style (opening throttle when still in leans) would make sipes wear looks more uniform, especially with slower rebound.
Last Edit: January 05, 2021, 02:27:55 PM by 3alfa3

Offline vdog99

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Re: z900 on track
Reply #5 on: January 18, 2021, 09:50:11 PM
At your next track day, go to the suspension vendor at trackside and ask him to do a baseline setup. It will probably cost around $60. He'll set your sag and clickers. After each session, you can go to him and he'll make adjustments based on your feedback. Definitely worth it.

My suspension guy set my rebound to max (or very close to max) at both ends for track riding. I'm getting an upgraded suspension in a few weeks (Andreani front, K-Tech rear) and will let you know how that turns out.

Offline zed9

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Re: z900 on track
Reply #6 on: January 19, 2021, 04:56:16 AM
Keep in mind the rebound adjusters on the factory suspension do very little over their range. This will change when you upgrade.
When you remove your forks, try forcing your left fork (where the rebound adjustment is) against the floor. Then turn the clicker. You'll see for yourself how ineffective it is.
Then try it after the upgrade. It will become clear.