Fork modifications - Gen 1 ZX10R - Page 4 - Kawasaki ZX-10R.net
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post #31 of 45 Old 10-24-2018, 10:56 AM
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This came today. Looks good quality. Oil is 5W !!!
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post #32 of 45 Old 10-24-2018, 01:44 PM
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Nice.

Post how the install goes and how it changes the feel of the forks.
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post #33 of 45 Old 10-26-2018, 04:29 PM
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Some pics.... Bitubo KFORK005 valve kit. Comes with 1L 5W oil , but is NOT enough !!!

I test forks revalve vs stock (same preload, same compression, LESS rebound for stock fork ) : much better respons from Bitubo version. I will do in Sunday a test drive.
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post #34 of 45 Old 10-28-2018, 11:38 AM
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Today I ride ~250km of flat roads, bumpy roads, twisted roads , bumpy twisted roads . Hire coming winter and I will test on the track next year .
Settings : same low speed COMP (-6) , 1 turn more front preload (4+1) .

BIG differences !!! More smooth on the bumps. When trail braking holding the line just perfect. Even when braking in the corner just holding the line, not going wide . On the exit out of the corner can put so much more power without going wide or front go unstable .


In a stock suspension shock was sooo bad . When I change it (with Elka) , front was weak link . Now ..... everything is OK .

For me this kit worth every cent.
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post #35 of 45 Old 10-29-2018, 04:18 PM
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Now reverse engineering

Stock REB shim stack (size in mm ):
1- 16 / 0.12
2- 16 / 0.12
3- 16 / 0.12
4- 16 / 0.12
5- 16 / 0.12
6- 14 / 0.12
7- 14 / 0.12
8- 12 / 0.12
9- 12 / 0.12
10- 9 / 0.315
11- 9 / 0.315
12- 9 / 0.315
13- 9 / 0.315


Stock COMP shim stack (size in mm ):
1- 16 / 0.12
2- 16 / 0.12
3- 15 / 0.12
4- 14 / 0.12
5- 13 / 0.12
6- 12 / 0.12
7- 11 / 0.16
8- 10 / 0.26
9- 10 / 0.26

Bitubo REB shim stack (size in mm ):
1- 17 / 0.15
2- 17 / 0.15
3- 14 / 0.15
4- 14 / 0.15
5- 8 / 0.20
6- 8 / 0.20
7- 8 / 0.20

Bitubo COMP shim stack (size in mm ):
1- 17 / 0.15
2- 16 / 0.15
3- 15 / 0.15
4- 8 / 0.20
5- 8 / 0.20
6- 8 / 0.20


Now U can go for a some changes on shim stacks . It will be better if U use 5W oil , and go for less HI speed REB and COMP . Even low speed REB is to much on stock shim stack.

Of course it will not be like bitubo setup because pistons have different size holes , and have 2nd COMP shim stack on rebound piston. But will be much better from a stock.

Last edited by teror1sta; 10-29-2018 at 04:34 PM.
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post #36 of 45 Old 10-29-2018, 04:36 PM
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What's humorous for those of us in the know is that there is a high probability that you would have experienced a similar result with the stock internals WITHOUT buying the 20mm piston kit... We were putting 5wt Synthetic oil into OEM 1000RR forks for a quick & dirty fix back in 2004 with the same basic results.

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post #37 of 45 Old 10-29-2018, 05:33 PM
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What a guro , who said it will be not a difference when change the shim stack :D Yep very funny ....
Why people porting head ??? It is stupid ! Why people change the pistons for more or less compression - It is a joke ! Why people change the cam shafts ... no point to do this ... :D Why to have REB and COMP adj , u only need "50mm cartridge" with some shims inside or even without shims (they do nothing :D).

Or maybe you tell me when put 5W u will change damping curve like when u change shim stack and pistons ????

Dude , stop type bullshits pls ....

Last edited by teror1sta; 10-29-2018 at 05:51 PM.
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post #38 of 45 Old 10-29-2018, 07:15 PM
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Quote:
Originally Posted by teror1sta View Post
What a guro , who said it will be not a difference when change the shim stack :D Yep very funny ....
Why people porting head ??? It is stupid ! Why people change the pistons for more or less compression - It is a joke ! Why people change the cam shafts ... no point to do this ... :D Why to have REB and COMP adj , u only need "50mm cartridge" with some shims inside or even without shims (they do nothing :D).

Or maybe you tell me when put 5W u will change damping curve like when u change shim stack and pistons ????

Dude , stop type bullshits pls ....

& that is why I hate these fukin forums... Nobody is objective at all. It never occurs to anyone that a fresh oil change or a different oil would alter the damping curves because they have never tried it. Instead of properly testing a theory you get seat of the pants observations at best which are completely subjective. Meanwhile people like myself who actually have a shock dyno, know how these things really work and try telling people the truth only get discounted on both sides or worse. It never stops and being honest with the consumer gets us absolutely nowhere...



For the record and only since you bring up head porting. I have seen MANY porting jobs actually lose horsepower. The problem is most people do port work when they are also doing cams, pistons maybe even a different exhaust or whatever mods they have decided to spend their hard earned money on. When they are done they have a dyno chart that shows an improvement, but cannot pinpoint to one specific mod that gave them the horsepower gains, but they will come on a forum and profess it works. Lastly everything on a motorcycle is a compromise. You improve one area another area will suffer doesn't matter if we are talking about cam phasing, induction tract length, exhaust, suspension, horsepower, geometry etc for every improvement there is a loss somewhere. All we do is chase the best possible compromise for the riders needs.
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post #39 of 45 Old 10-29-2018, 08:21 PM
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Quote:
Originally Posted by teror1sta View Post
Now reverse engineering

Stock REB shim stack (size in mm ):
1- 16 / 0.12
2- 16 / 0.12
3- 16 / 0.12
4- 16 / 0.12
5- 16 / 0.12
6- 14 / 0.12
7- 14 / 0.12
8- 12 / 0.12
9- 12 / 0.12
10- 9 / 0.315
11- 9 / 0.315
12- 9 / 0.315
13- 9 / 0.315


Stock COMP shim stack (size in mm ):
1- 16 / 0.12
2- 16 / 0.12
3- 15 / 0.12
4- 14 / 0.12
5- 13 / 0.12
6- 12 / 0.12
7- 11 / 0.16
8- 10 / 0.26
9- 10 / 0.26

Bitubo REB shim stack (size in mm ):
1- 17 / 0.15
2- 17 / 0.15
3- 14 / 0.15
4- 14 / 0.15
5- 8 / 0.20
6- 8 / 0.20
7- 8 / 0.20

Bitubo COMP shim stack (size in mm ):
1- 17 / 0.15
2- 16 / 0.15
3- 15 / 0.15
4- 8 / 0.20
5- 8 / 0.20
6- 8 / 0.20


Now U can go for a some changes on shim stacks . It will be better if U use 5W oil , and go for less HI speed REB and COMP . Even low speed REB is to much on stock shim stack.

Of course it will not be like bitubo setup because pistons have different size holes , and have 2nd COMP shim stack on rebound piston. But will be much better from a stock.

Couple things for you. First, this "2nd comp stack" is called a midvalve, and if you dont know how it works in relation to the main stack you're going to cause cavitation and other problems, and by leaving it out you are creating a VERY different picture than what comes on Bitubo. And second, you're using the Bitubo kit to base changes on the OEM stack. This is going to lead you down a very confusing and frustrating path. It is extremely clear you are trying to help and provide information to the masses, and for that I thank you! But it may be worth understanding the whole picture before making recommendations.
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post #40 of 45 Old 10-30-2018, 12:17 PM
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"which are completely subjective" Yep , very .... going thru one corner with 180 km/h and front go unstable , and after i change the pistons go thru the same corner with 200 km/h without front go unstable . OK it is subjective . It is my imagination. I love someone to tell me "can not happen " . Before many years , Gurus like U tell me that.... " U cant use a D15 honda engine (1.5l SOHC 90 hp stok) to build , a time atack car! " . And many years from then fastest car in class 1.6 is my honda civic with D15 engine and I laugh on this Gurus how bad they are ..... If u can do something this not mean it is impossible !


evallarta1 , I will be glad if I learn something new from you ! I not telling " I know everything ". And I not telling to copy / paste shims size from bitubo kit. I don't make recommendations , I make suggestions ! And if I am whiteryno111 , I will do some changes on shim stack and tests .
I will go for bigger pistons holes + 0.2 . 5W oil

REB :
1- 16 / 0.12
2- 16 / 0.12
3- 16 / 0.12
6- 14 / 0.12
7- 14 / 0.12
9- 12 / 0.12
10- 9 / 0.315
11- 9 / 0.315
12- 9 / 0.315

COMP
1- 16 / 0.12
2- 16 / 0.12
3- 15 / 0.12
4- 14 / 0.12
5- 13 / 0.12
8- 10 / 0.26
9- 10 / 0.26


What U think ? For me this will give more fast REB (hi and low) and more fast HI COMP .
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