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post #1 of 18 (permalink) Old 06-23-2007, 11:18 AM Thread Starter
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Suspension porn - UPDATED - now with some Swedish

picked up a Matris fork kit from Department of Suspension

Having put Racetech emulators in bikes, let me say, this is MUCH MUCH MUCH less involved. No mods to the damper tube at all. The Matris valve has a nice fit to the ID of the fork tube and has an o-ringed portion that seals down in the damper tube. It controls oil damping via a seperate shim stack for compression and rebound. Basically, remove forks, drain oil, lube new valves push them in, install new spring, new spacer and cap. Done. The Matris valves appear machined to specific damper tube geometry per application. Racetech emulators are basically 'generic' for a given range of fork sizes. Also, with Racetech emultors, I've noticed they recommend 15wt for just about every bike with damper tubes as a starting point to get the rebound right. How can everybike need to start with 15wt if the individual stock damper tube in each bike still controls rebound?

Anyway, the Matris kit comes with everything you need including oil. I put one together first and it was noticably firmer that the stock one when pushed down together side by side. My kit came with .85 kg/mm springs. The stock Yamaha springs are progressives that go from .75 to 1.2kg/mm during their stroke. Now I gotta go ride it.

Next month, Ohlins shock.....


Received thw shock yesterday from Jason at Department of Suspension He gave me a damn good price. Paid a few bucks under $700 shipped. The correct part number for the '07 and up bikes is a YA723. This part number is ONLY listed on Ohlins main site as it is a brand new part. I received the first one shipped to America. For the '07 and up bikes, the shock body is now aluminum and the reservoir goes under the seat and is held down by the spare rubber hold down. The reservoir will fit in a pocket under the seat PEFECTLY. Hmmmm, Yamaha does own Ohlins. I wonder if they planned for this? The '04-'06 shock is steel bodied and mounts the reservoir on the outside left of the seat subframe. It would not fit '07 bikes without grinding off the mouting tab for the helmet lock and butting teh reservoir tight against the passenger pegs. I will have it put on later today or tomorrow with installation pics. Too bad it is only 49 degrees here today.

The Matris fork kit has worked very well this summer on the backroads of West Virginia and Ohio. Front end feedback is very good and confidence is high. I pushed the bike so hard after one 500 mile day (all twisties, no highway!) that I blued the sides of the front tire.
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Last edited by jeff in ohio; 10-12-2007 at 09:09 AM.
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post #2 of 18 (permalink) Old 06-23-2007, 12:06 PM
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dam... thats awesome looking... how much???

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post #3 of 18 (permalink) Old 06-23-2007, 03:33 PM
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http://www.departmentofsuspension.co...plications.pdf

looks like you are in luck with 06' stuff as they dont have any o7

check the main page they got some pretty nice sale shiza which would prolly fit my bike but I will wait till its "officially" for the 07's

and if Jeff in Ohio would be kind enough to give us some review type info that woudl get my one step closer to buying...
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post #4 of 18 (permalink) Old 06-23-2007, 04:57 PM Thread Starter
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Quote:
Originally Posted by doc_simple
http://www.departmentofsuspension.co...plications.pdf

looks like you are in luck with 06' stuff as they dont have any o7

check the main page they got some pretty nice sale shiza which would prolly fit my bike but I will wait till its "officially" for the 07's

and if Jeff in Ohio would be kind enough to give us some review type info that woudl get my one step closer to buying...

welllll...

The '04-'06 forks are identical. For '07, they changed the fork tube bushings and the upper spring seat and the lower sliders (black and with new caliper mounts) and that is it. All the guts of the forks are identical, thus the '04 fork kits fit my '07. Plus, I also e-mailed matrisdampers.it to confirm this. They said no problem with using that kit in an '07. Do NOT believe some of the write ups that say the 2007 FZ6 has carttridge forks. The USA 2007 models for sure do not! Same damper tube setup as previous years. Same spring rates, same everything. The Canadian website and some of the Euro Yamaha factory websites mention 'cartridge forks' as a new for 2007 feature. The recent write-up in Motorcycle Consumer News also mentioned cartridge forks as new for 2007. A quick check of the parts diagrams AND the 2007 factory service manual shows the exact same guts as '04-'06 - good ol plain jane cheap damper rods. Might have been a case of Yamaha marketing doing a press writeups before finish production specs were determined.


As for a review, I gotta some kinda intestinal flu thing here since slapping that stuff on yesterday. I think I've hit the shitter like 20+ times since 1:00am this morning. Any riding will have to wait....
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post #5 of 18 (permalink) Old 06-24-2007, 07:03 PM Thread Starter
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Thumbs up

well, went for a quick ride today with the new front suspenders. Had to play pit crew and photog for a friend at Nelson Ledges raceway today but got in a ride afterward on the way home. Front is firmer and seems more in control. Not as much brake dive. The stock springs are .75kg/mm for the first 2.5" or or so and then 1.2 kg/mm for the next 2.5" or so. Problem is, the front end dives so rapidly under heavy braking that the forward monetum quickly eats up the .75 and takes you into the 1.2 range with pretty good force. Stock preload is 17mm. Stupid me did not measure stock sag though. Anyway, the Matris springs are .85 kg/mm. With the Matris adusters all the way out, they are preloaded 17mm. I spun the adjuster into the first ring which preloads them about 19mm. With this setting we did a quick (very quick) sag measurement after returning from the track day. Sag with just the bike was about 19mm. With my geared 175lb body on it, sag was just about 36mm. The revised front end really highlights the bounciness of the stock rear shock now. Now time to adress that problem. All in all, the front is very good.
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post #6 of 18 (permalink) Old 06-24-2007, 08:03 PM
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thanks for all the info, hope your over the , eh, err whole shitter thing
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post #7 of 18 (permalink) Old 06-27-2007, 03:37 PM
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Yeah I need to do something to my forks they are way to soft I noticed they seem to get harder the more they compress so I got them lowered like 1/2inch and the back is as stiff as it gets I barely have any sag in the back as i am about 145lbs but it seems to help make the front more planted. I will defiantly look into this mod as I was gonna go with Racetechs. Another mod is the to put a R6 rear shockin the back it is alittle short and kinda soft for the weight of the bike but it could be made stiffer and there might be a way to shim up the back back to factory height.
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post #8 of 18 (permalink) Old 10-12-2007, 09:24 AM Thread Starter
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bumped to top to show update of shock addition
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post #9 of 18 (permalink) Old 10-12-2007, 02:16 PM
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Could you post some pics with the new fork kit and rear shock?

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post #10 of 18 (permalink) Old 10-16-2007, 12:02 AM
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Matris fork spring selection

Jeff in Ohio,
Thanks for the info on the fork kit. I just got back from a 2up ride and NEED something on the front end as any sudden braking gives me a wheel-barrell type feeling. Do you know if the kit can be ordered with heavier springs than you recieved? 230 with gear + passenger of half again as much.
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post #11 of 18 (permalink) Old 10-16-2007, 06:45 PM Thread Starter
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Quote:
Originally Posted by wagontrain
Jeff in Ohio,
Thanks for the info on the fork kit. I just got back from a 2up ride and NEED something on the front end as any sudden braking gives me a wheel-barrell type feeling. Do you know if the kit can be ordered with heavier springs than you recieved? 230 with gear + passenger of half again as much.
The instructions mention .85, .90 and .95 springs. Get a hold of Jason at Department of Suspension


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post #12 of 18 (permalink) Old 01-23-2009, 09:05 PM
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Does any one know if the Department of suspension still around. I tried the links and get nothing. Figures when I am finally ready to do some mods on the bike I cant find the parts.
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post #13 of 18 (permalink) Old 01-24-2009, 06:29 AM
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you dont need 500 miles to blue the sides of your tires, it can be done on 1 pass of your favorite road, and the blue is just the different heat cycle the tire has gone through, after it sits cold for a few days it will turn blue.

srm1371, just get racetech emulators and springs. or for the same cost swap to r6s front ends.
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post #14 of 18 (permalink) Old 01-25-2009, 09:20 PM
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looks like its going to be the racetech emulators and springs. Apparently there is no source for the shims to mod to r6 forks
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post #15 of 18 (permalink) Old 01-25-2009, 09:58 PM
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if you want to spend some money you can get AK-20's from traxxion dynamics.


Traxxion Dynamics - AK-20 Axxion Cartridge Kit Product Detail
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