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[RMZ 250 08] Gold Valves in Base Valve

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hey guys!

I'm doing a Showa out of a 250 RMZ 08 and its got gold valves instead of the original base valves.

I'm not familiar with GVs but its impressive how they come to daylight out of dirty black oil:banana:

So I need some help now.

Here we go:

Rider weight: 74 kg in street clothing

Skill: novice

spring is 4 mm preloaded

wasnt able to test spring yet, I'll do it tomorrow

Base Valve (gold valve)

6x30.15

21.1

2x30.15

2x30.1

28.1

26.1

24.1

21.1

19.1

17.1

Baseplate

Reb and MV are stock (peening was still there)

MV

6x20.1

float: appr. 0.2 mm

Reb

2x20.1

10.12

19.1

18.1

17.1

16.1

15.15

14.15

13.15

12.2

Rider complaints its incredibly stiff.

So, like I said, I'm not familiar with GVs.

I tought RT recommends to form the MV to a checkvalve?! Or just for specific GV styles?!

I know there are lists with different settings for GVs. The guy didnt get this list (he didnt get the stock pistons too form the preowner...).

I found some lists for download at the RT homepage http://www.racetech.com/page/id/100

But I dont know which valve I got.

Here are some pics:

p1040122m.jpg

By vietze at 2011-11-11

p1040121q.jpg

By vietze at 2011-11-11

Could anyone enlighten me?

If you ask me, I would rather go on stock pistons and tune them.

But now I have to deal with the GVs...

My thoughts on this stack:

I would remove a couple of faceshims and the crossover, perhaps also go softer on the MV.

Thanks for helping!

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not familiar with showa stacks and gold valves, the biggest difference I see is a 17 clamp (BV) compared to the 15 clamp of a 2011 RMZ250

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I think they changed some major things for 2010 or 2011, I just got 08 and 09 stacks.

Stock stack for RMZ 250 08:

Base

30x0.11-6

19x0.11

29x0.11

28x0.15

27x0.15

26x0.15

25x0.15

24x0.15

23x0.15

22x0.15

21x0.15

20x0.15 <-- clamp

24x0.2-2

30,5x2

16x0.3-3

RMZ 250 09

BV

30-0.1 (6)

19-0.1

29-0.1 (4)*

28-0.15*

27-0.15

26-0.15*

25-0.15*

24-0.15*

23-0.15

22-0.15

21-0.15

20-0.2 <-- clamp

24-0.2 (2)

plate

16-0.3 (3)

compared to 2011

22 - 30.1

28.1

26.1

24.1

22.1

20.1

18.1

16.1

15.2 b

So we cant compare them I guess.

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You have mid check valve in base valve now, different spring and you also have both plates there, RT and stock= not good. RT doesn't recommend to use it in BV, in some cases you should convert stock mid valve to check valve (personally I never do that). How much you have BV check valve lift?

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You have mid check valve in base valve now, different spring and you also have both plates there, RT and stock= not good

. RT doesn't recommend to use it in BV, in some cases you should convert stock mid valve to check valve (personally I never do that).

Sorry, I dont get what you wanna telling me:excuseme:

"How much you have BV check valve lift?"

I havent meassured it, but it was a lot. I assume more then 1,5 mm.

I can do it tomorrow!

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I am telling you that at the moment you have RT mid valve spring and valve stopper in BV. RT spring is much lighter than stock and slide collar is longer. That effect to reb stroke and can make the fork feel firm.

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I am telling you that at the moment you have RT mid valve spring and valve stopper in BV. RT spring is much lighter than stock and slide collar is longer. That effect to reb stroke and can make the fork feel firm.

Okay, now I understand what you're saying but not what you mean.

I got a MV spring as Checkvalve spring on the base?!

But look at the diameter of the springs!

The MV spring got a much bigger diameter compared to the bv spring.

So are you sure?

Which part is the "valve stopper" you are referring to?

The golden washer or the part right next to it?

How does the BV checkvalve affect the performance this much?

I always thought this CV gains so much flow so it hasnt any influence to the reb stroke?!

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Okay, here the missing information:

Springs: 4,4 N/mm (stock) should be fine for the rider

float Check Valve Base: 1,5 mm

mounted like this:

p1040130pq.jpg

By vietze at 2011-11-12

p1040131.jpg

By vietze at 2011-11-12

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Thats too much lift and that RT spring is too light also. Now I am not sure how much is stock lift but I think it is something around 0.2mm. That valve stopper is (golden part) smaller than stock with longer sleeve.

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Ah, I see!

The stock valve stopper should look like this:

base_oem.jpg

Source: dogger thread

Well, what do you recommend me to do?

Buy stock parts...?! I think the owner doenst like this idea much.:busted:

So I have to shorten the sleeve or is there any other possibility?

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So I have to shorten the sleeve or is there any other possibility?

1. try to get the information of the stock float

2. use ID8mm shims or a washer to reduce float with the GV sleeve

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1. try to get the information of the stock float

2. use ID8mm shims or a washer to reduce float with the GV sleeve

1. If I'm lucky I will the the information soon

2. I got it, thanks!

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what information do you want to know ?

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As Jusa and kawahama said, the stock lift of the BaseValve Checkvalve!

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the 2010 stacks are very stiff , you don't want those , the 08 std is pretty plush ,on the Gv I would remove half the low speed and the 30.15 shims in the hs

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I have never altered one sorry , but if it's stiff I can't see the correlation with the return path on the base ?

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I have never altered one sorry , but if it's stiff I can't see the correlation with the return path on the base ?

Well, me either. But I agree that it is a huge gap compared to kayaba.

I dont know the stock showa float. Surely that wont fix the problem of harshness but it will be a small step in the direction of improving the fork as a whole I think!

The harshness is caused by the stiff valving of the Base, perhaps in combination of the MV which didnt fit to a novice rider.

But I dont have experience with showa forks (dont have much experience at all), its just was I think about it.

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you could put the std shim stack on the Gv as I don't think the port size is much different

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Those are Type 1 Gold Valves. Someone put them together wrong- they should have the stock check plates, springs and stoppers. Like others said, that shouldn't affect the harshness. The stack you have listed is a bit on the stiff side for the Gold Valves. By the look of the stack, it is for a *much* heavier rider. What type riding is your rider doing? Woods or moto? Have you had a chance to test the fork spring rate yet?

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