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Enduro Suspension Tuning & maintenance of Enduro forks, shocks, etc |
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#1
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KYB SSS Valving Input Please
I put a full 2008 YZ450 Front end on my 2000 GasGas XC300. I am 51yrs old, (riding 42 yrs). 6' 4", 250lbs in street clothes.*I enjoy all kinds of riding but prefer difficult single track, trails and hills.*(probably*B-C Enduro). *
* I changed springs to Racetech 48 with 5mm of preload.* I have tried to soften the forks about 7 times so far and below is what I have now for a tune. The forks are still too stiff on trail trash even with the compression adjusters complete loose. They work great for big hits but they are too stiff most for most all else. * Midvalve * Nut Washer 11mm*(x1) 0.25mm 12mm (x1) 0.11mm 14mm (x1) 0.11mm 16mm (x1) 0.11mm 18mm (x1) 0.11mm 13mm (x1) 0.11mm 20mm x0.045 (x3)* 0.11mm (Stock had 4) Piston 20mm x 0.045" (x2)*0.11mm (Stock had 4) 17mm x 0.045" (x2) 0.11mm (Stock had 3) 11mm x 0.01" (x2) 0.25mm 17mm x 0.01" (x3) 0.3mm 17mm x 0.045" (x1) 0.11mm (moved from above) Collar * Estimated Midvalve Float* 0.5mm (as I removed*two*0.11mm shims) * Base Valve * Nut Cup Washer 4 holes Spring big silver washer with collar Piston 32mm (x9) 0.11mm 20mm (x1) 0.11mm (from*midvalve stack) 32mm (x6) 0.11mm* (stock was 18x 32mm) 30mm (x1) 0.11mm 28mm (x1) 0.11mm 26mm (x1) 0.11mm 24mm (x1) 0.11mm 22mm (x1) 0.11mm 20mm (x1) 0.11mm 18mm (x1) 0.11mm 16mm (x1) 0.11mm 20mm (x2) 1.58mm 11mm (x2) 0.25mm * 310cc 5w BelRay oil * * It seems that the compression screws do not have a big impact on the dampening.* Any input would be appreciated. |
#2
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I know sht about actual valving. I cheated and a mate revalved to KTech Club specs. Much betterer.
Opening to full open on the clickers can be more harsh as it blows through then gets stiff real quick. Best keep within several clicks of middle and find best comprise. Then revalve if that's not good enough. Any more clicks is out of range. Sorry can't give actual valving specs as I don't have them. But they can be made good for technical.
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'07 EC300 GG '14 TXT250 GG '? 496 CPI Cheetah RZ/RGV hybrid '22 765 Street Triple RS '21 XTrainer '69 Stinger T125 Suzuki '23 TRS 250RR (it's a Trials thing) |
#3
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Why all this lbs talk.. now I have to do conversions!
Being YZF450 forks, they'll probably have quite firm ICS rates. This adds quite a bit of firmness, especially when added with firmer preloaded springs as well. .5mm is quite a large float, and your mid very soft. I'd go back to around .4mm float, and a more traditional mid valve. Address the basevalve!! Piston 32mm (x9) 0.11mm 20mm (x1) 0.11mm (from*midvalve stack) --- I don't like crossovers this small. I'd be more around 26/28mm if using. 32mm (x6) 0.11mm* (stock was 18x 32mm) 30mm (x1) 0.11mm 28mm (x1) 0.11mm 26mm (x1) 0.11mm 24mm (x1) 0.11mm 22mm (x1) 0.11mm 20mm (x1) 0.11mm 18mm (x1) 0.11mm 16mm (x1) 0.11mm ----> this is your main issue. ----------add clamp 14mm x.3mm 20mm (x2) 1.58mm 11mm (x2) 0.25mm Simply changing the clamp to a 14/13mm shim x .3mm you'll soften the whole stack up. You may wish to pull a couple more face shims as well. Also, considering that you've upped spring rates, you may wish to add a bit more rebound control as well. |
#4
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Note, just checked spring rates, and they should be fine. Even if you have the firmer ICS springs.
So I'd add another face shim back to both sides of the mid valve. That will close your float to approx .39mm. Then soften the basevalve to something like the following. 32 (6) 26 32 (6) 30 28 .. 14.3 (or 13) Then test. |
#5
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Thank you both.
Jakobi -So to make sure I understand you correctly I should modify it like this? Midvalve * Nut Washer 11mm*(x1) 0.25mm 12mm (x1) 0.11mm 14mm (x1) 0.11mm 16mm (x1) 0.11mm 18mm (x1) 0.11mm 13mm (x1) 0.11mm 20mm x0.045 (x4)* 0.11mm (Stock had 4) Piston 20mm x 0.045" (x3)*0.11mm (Stock had 4) 17mm x 0.045" (x2) 0.11mm (Stock had 3) 11mm x 0.01" (x2) 0.25mm 17mm x 0.01" (x3) 0.3mm 17mm x 0.045" (x2) 0.11mm (moved from above) Collar * * Base Valve * Nut Cup Washer 4 holes Spring big silver washer with collar Piston 32mm (x6) 0.11mm 26mm or 28mm (x1) 0.11mm (I will see if I can find one in a set of WP43s) 32mm (x6) 0.11mm* (stock was 18x 32mm) 30mm (x1) 0.11mm 28mm (x1) 0.11mm 26mm (x1) 0.11mm 24mm (x1) 0.11mm 22mm (x1) 0.11mm 20mm (x1) 0.11mm 18mm (x1) 0.11mm 16mm (x1) 0.11mm 14mm or 13mm (x1) 0.3mm [U](I will see if I can find one in a set of WP43s) Do I remove both 20mm and the 11mm or do I keep the 11mm? Thank you for the help! |
#6
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The shims below the main stack are referred to as the bleed stack. By running as below they don't block any ports off, which isn't needed for off road so I'd keep them as is:
20mm (x2) 1.58mm 11mm (x2) 0.25mm Have a look at the assembly and where they sit and you'll see what I mean. Everything above looks pretty good. |
#7
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Ok so my Base Valve will look like this?
* Nut Cup Washer 4 holes Spring big silver washer with collar Piston 32mm (x6) 0.11mm 26mm or 28mm (x1) 0.11mm (I will see if I can find one in a set of WP43s) 32mm (x6) 0.11mm* (stock was 18x 32mm) 30mm (x1) 0.11mm 28mm (x1) 0.11mm 26mm (x1) 0.11mm 24mm (x1) 0.11mm 22mm (x1) 0.11mm 20mm (x1) 0.11mm 18mm (x1) 0.11mm 16mm (x1) 0.11mm 14mm or 13mm (x1) 0.3mm 20mm (x2) 1.58mm 11mm (x2) 0.25mm I see your point how adding the 13/14mm will soften the whole stack. So if I understand correctly, my present stack does not have a bleed shim because the 32mm shims are placed directly against the piston? A bleed shim in this stack might be an 11mm placed between the piston and the first 32mm of the main stack? This may be a silly question but if I can not get a single 13 or 14mm x 0.3mm thick can I build it from multiple thinner shims (adding up to 0.3mm) and get the same results? |
#8
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I found that I have a pair of 21mm and a 24mm. Will they work in place of the 26 or 28 or will that make it too soft?
I also have a pair of 12mm, 14mm and 16mm 0.11mm thick. Can I stack these to get close to the 13/14mm 0.3mm or would it be better if I just order the correct ones? If I am ordering shims should I get the metal free pistons too or don't replace them until they break? |
#9
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You can try the 14x.11mm clamp. Usually just aim for more to allow more room for the shims above to flex over the clamp if required.
You can try the 24mm crossover if you like as well, or simply leave the crossover right out and run a straight stack. With the KYB they have an option for a bleed stack. This essentially bypasses the clicker. By running your 11.25 (2) and the spacer at the bottom of your compression stack you are leaving the small ports open, and bypassing this. This is different to what is referred to as a bleed shim, and that is exactly what you have said above. It sits between the face shim and piston face to allow the ports to be partially open at all times, allowing bleed. The free pistons, if they aren't broken and look in good condition I would simply drill them to avoid the pressure build up that breaks them. Otherwise if you want to drop some coin you can get the metal ones. |
#10
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Thank you Sir!
So I could actually run the 12mm under the 14mm to make it a bit thicker and allow for more room for the compression stack to move. For my situation is there a benefit to leaving the bleed stack in place or should I invert it as shown below? Am I correct that the 24mm in the middle of the twelve 32mm will soften the initial part of the stroke when compared to the consecutive stack of 32mm? Nut Cup Washer 4 holes Spring big silver washer with collar Piston 32mm (x6) 0.11mm 24mm (x1) 0.11mm 32mm (x6) 0.11mm 30mm (x1) 0.11mm 28mm (x1) 0.11mm 26mm (x1) 0.11mm 24mm (x1) 0.11mm 22mm (x1) 0.11mm 20mm (x1) 0.11mm 18mm (x1) 0.11mm 16mm (x1) 0.11mm 14mm (x1) 0.11mm 12mm (x1) 0.11mm 11mm (x2) 0.25mm 20mm (x2) 1.58mm |
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