YZF Suspension Midvalve??
Posted November 13, 2001 - 03:27 PM
As for oil, I think both forks take about 1.5 quarts.
Posted November 14, 2001 - 06:39 AM
Posted November 14, 2001 - 08:54 AM
My seals on my bike started leaking right after I got it. I changed the seals with trimmed ones and no problems since.
If it was me, I would.
How's the collor bone doing?
Posted November 18, 2001 - 01:14 PM
Yesterday I installed the Gold Valve and new rear spring in my shock and reassembled everything. It was much easier than I expected (alot easier than forks IMO). The hardest part was removing the circlips and figuring out which shim was which (the Race Tech video is really helpful)! I am going to a local suspension shop tomorrow to get it charged with Nitrogen.
I started on the forks today and I am almost done. I just finished removing the seal head. And boy was this a pain (literally)! I tried to remove the seal head by just gripping it with a leather glove and squeezing the hell out of it...it didnt work, and successfully gave me nice blisters I finally came up with the ingenious idea of using PVC pipe to unscrew the seal head. I got about a 3ft piece of PVC pipe that fit over the "+" shaped top and then I cut 4 grooves in it with a Dremel. I then drilled a hole (all the way through) midway up the pipe, and stuck a screwdriver in it (to give me leverage) This made it easy! Thanks for the tips on not drilling too far...you dont have to drill far at all!
Well I cant wait to test it out at the track! I am really glad I did this job myself...because in the process I have learned so much! The hardest part was convincing myself to take apart $1000+ suspension and risk screwing it up! I now realize how the shim's thickness and diameter affect the compression and rebound (it is actually really cool) I just thought I would let the guys who have taken their suspension completely apart know. Because everyone I try to tell what I am doing cant follow, because they havent seen the internals! Well thanks for all your help you guys are great. I will let you know when it is "completely" finished! Thanks,
[ November 18, 2001: Message edited by: motoman393 ]
Posted November 18, 2001 - 05:27 PM
[ November 18, 2001: Message edited by: BK14MX ]
Posted November 18, 2001 - 06:00 PM
I also read that in Dec. 01' Dirt Rider. I use a similar lubricant every time I ride my bike, it is a dry teflon lube, and it works very well. This is why my stock seals have lasted exactly 1yr and they still are good/non-leaking (but I am replacing them anyway since they are old) Later,
Posted November 19, 2001 - 09:29 AM
I havent changed the shims/installed the gold valve in my forks yet (they are still apart in my garage) I had to completely finish the shock and linkage (so I dont get parts confused/misplaced)! I am revalving them either tonight on tomorrow morning. I was going to use Race Tech's recommended setup (and change it if I dont like it) Here is what they call for:
Low Speed Compression Valving = cL6
High Speed Compression Valving= cH5
Oil Level= 90mm
Compression Adjuster= 10 out
Rebound Adjuster= 14 out
Fork spring preload= 8mm
Fork Spring set length= 453mm
My springs are .44's
and remember I weigh 168lbs w/o gear
(2) .15 x 21
.10 x 13
(2).10 x 21
.10 x 19
.10 x 17
.10 x 14
.10 x 13
.10 x 12
.10 x 11
You mentioned that Race Tech's valve setup will be too harsh? If you have a stack recommendation I would love to hear from you! Thanks a bunch,
Posted November 20, 2001 - 02:12 AM
Going with their stack will give a stiff ride (with a capital S). I've e-mailed you what I'd try.
Posted November 20, 2001 - 08:54 AM
I am almost through with my forks and I am stuck in a bind! How are you guys removing the Valve holder from the damping rod (#'s 19 and 21 in the race tech instructions, inside the cartridge) it says that if I dont install the cylinder seal then make the compression valving stiffer. But, I want to install the cylinder seal, because I dont want to take any shortcuts! I would really appreciate any help that you can give because I would like to get these forks done today! Thanks,
Posted November 20, 2001 - 03:38 PM
I'm not sure what you're talking about, but I can make some assumptions.
It sounds like you have already drilled the peens that are pressed into the top of the cartridge, and have removed the valve head (aka, seal head, or cylinder valve head).
When this comes out, you can slide out the rod, removing it from the cylinder. To install that Race Tech valve seal, you have to remove the piston and valve assembly from the end of the rod, (this assembly, is also the assembly that contains the mid-valve, in which you'll install the Race-Tech check-plate).
To remove this, you'll need a 15mm wrench, to fit over the cut width, just above the rebound spring (that short heavy spring that makes contact with the seal head when you extend the forks).
Since this assembly is loctited, you may have to heat it, but stay away from the rod since the heat can damage the rod coating. It's a toug process.
To hold the rod, you'll want two nuts to thread on the end of the rod. Lock them down on each other, then use a socket or wrench to hold them in place. Protect the rod with plenty of towels in case of slippage. By the way, those lock nuts are a common metric size and thread, so most hardware stores stock them.
Be careful not to damage the threads by allowing the nuts to shift or move during this process.
When the rebound piston assembly comes off, there will be a small spring that loves to escape into small corners of the garage. Keep your eyes and hands ready and don't forget to put it back in place on the re-assembly.
There's also a needle in the rod, but it's sealed so it seldom falls out.
Let me know if I'm way off from what you're looking for.
I'm sure ScottF and others may have some great tips as well.
Posted November 20, 2001 - 05:24 PM
Posted November 20, 2001 - 07:17 PM
The main reason that I need to remove the valve holder from the damping rod (these are the names race tech uses) because I need to install the cylinder seal that race tech gave me and I have to remove the valve holder first (this piece is at the very end of the damping rod and is the piece the mid valve, spring, and shims go on, it is Stainless steel like you said)) If I dont install the cylinder seal, (it will still work) But they say the cylinder seal, "makes the valving much more consistent, firmer and plusher as well" ...But if I dont install it I need to go up 3 on the low speed compression stack and 1 on the high speed compression stack due to "blowby" (which would mean a recommended stack of cL9 cH6). This is what Brad @ race tech told me. Have any of you guys installed gold valves w/o using the cylinder seal? Did you really have to go stiffer on the valving like race tech recommends?
So you are saying if I get 2 nuts and thread them on the end of the damping rod (and snug them up) I will be able to get the valve holder off to install the cylinder seal? Because that piece seems like it is in there pretty good! A socket wont fit the end piece either it is shpaed like this (it doesnt have 6 sides like normal, only 2 straight sides and 2 curved ends):
and a regular socket wont fit, only a crescent wrench would work or an 18mm (I think)
I already removed the midvalve and installed the check plate (this was real easy to do) and all I have to do is decide which stack I am going to use, and install the cylinder seal (only if I can get that piece off) and then reassemble everything! Thanks for your help...all my frustration Im sure will be worth it whenever I have a bike that rides like a "Cadillac" on the dirt because it as already as fast as a dragster LOL! Thanks,
Posted November 20, 2001 - 07:23 PM
Posted November 20, 2001 - 09:36 PM
First of all, DO NOT polish the compression rods. They are coated with a special soft material that is designed to work with the valve head bushing.
They are not meant to be shiny and smooth like you might expect. If they have any groves where you can see shiny material, they need to be replaced or smoothed and re-coated.
Good thing you said something because it's a costly process to fix this. Ignore any instructions that Race Tech provides recommending that you do this.
As for that valve assembly that you're trying to remove, you're right. It's really on there. You cannot hold the rod with anything other than a set of lock nuts. And I thought the only tool that fit this was an open-end 15mm. I could be wrong about the size.
I would recommend removing the valve shims and piston, then applying some concentrated heat to the area, but don't smoke the rod coating.
Place the assembly on the table, with plenty of towels and apply pressure evenly to avoid a tool slippage.
Now, should you install this plate that Race Tech is talking about?
If you remove the mid-valve I would install it. If you don't remove the mid-valve, I would leave it along. What I don't like about this plate is that works as a patch, running interference with the function of the seal head. It's a great combo if you run bottoming cones, but things seem to get goofy in the long run when this plate is used with the factory seal head.
Also, Race Tech made the plate too thick. Which means you'll most likely find that the seal head does not screw down as far as it did without the plate in there. Perhaps they fixed this compared to when I was last working with their stuff.
And I'm sure you have seen my earlier post about the drilled peen holes leaking post assembly.
Hope this helps.
Posted November 21, 2001 - 06:15 AM
To hold the damper rod, you can try double nutting it, or buy a damper rod holder. Like Paul said, if you clamp it up high where the spring spacer is, you won't risk damaging it where it slides through the bushing. This delicate rod is aluminum, anodized and teflon coated. As DaveJ knows all too well, you do not want to anything to harm the finish of this expensive part.
Posted November 21, 2001 - 07:14 AM
Yesterday, I thought of that same idea of using the lock nut to remove the end piece, but I thought it would damage the threads (if you only knew some of the things I tried to get it off LOL)! Well I just now removed the 2 pieces off both the damping rods and it was very easy to do with the 2 lock nuts method. I really appreciate it...well I better get back to putting my forks together I will let you know how it goes when I get finished! Thanks,
Posted November 21, 2001 - 07:29 PM
I went ahead and used RT's recommended valve stack, just so I could be at a "base". Whenever I ride it and after I break in the springs I will see how it is. If it is too harsh or stiff I will be swapping out shims to your specs! Thanks a bunch, I owe ya one! Later,
Whenever I go back to the track in Splendora in about 2 wks...I will take some pics of the triple I wrecked on, and post it up here!
[ November 21, 2001: Message edited by: motoman393 ]
Posted November 22, 2001 - 04:56 AM
I missed the explanation of how you wrecked. What happened and what did you injur?
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