Alternative shock linkages

There seems to be more and more members appearing that are racing the ZXR400 so i've created a special section just for you to show off results, discuss meets etc etc.

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zimm
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Re: Alternative shock linkages

Post by zimm »

just for reference,

NWS linkage (black) v H1 linkage (silver) v L linkage (grubby)

Image


little difference between NWS and H, L has quite different proportions
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banner001
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Re: Alternative shock linkages

Post by banner001 »

Hi Zimm, can you please post up the centre to centre distances of the bolt holes for these three, along with the single angle measurement if possible?

That should be all the geometry of the thing then.
UK ZXR400 L3 (1993) - Fully restored and on the roads, my green beast!
JPN ZXR250 A2 (1990) - Revs to 19,200rpm... 'nuff said :smt003
zimm
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Re: Alternative shock linkages

Post by zimm »

next time they are apart.. sure .. not stripping bikes just to measure though :)

all you really need to know is .. "try an H linkage", if you dont like it swap back .. there's little difference in feel between NWS and H
AFM327
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Re: Alternative shock linkages

Post by AFM327 »

Zimm is correct, I have an NWS and an H2 link and they are the same. Hold them up together and all the holes line up. I might have both in a spares box I'll take a look. I know I have an NWS handy that I can measure. :smt003
Leey
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Re: Alternative shock linkages

Post by Leey »

Zimm dropped around to me a H linkage to try out as he runs a nws linkage and they look quite the same.
Hopefully my tyre will stop blistering with the new linkage.
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banner001
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Re: Alternative shock linkages

Post by banner001 »

I've got a h linkage to put on my track bike, when I swap that for the l on there I'll measure them up and weigh them...is the nws one just lighter than the h then?
UK ZXR400 L3 (1993) - Fully restored and on the roads, my green beast!
JPN ZXR250 A2 (1990) - Revs to 19,200rpm... 'nuff said :smt003
zimm
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Re: Alternative shock linkages

Post by zimm »

No, quite a bit heavier if memory serves.. Although I've never actually weighed them.
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Re: Alternative shock linkages

Post by banner001 »

so whats the advantage? im sure that it was mentioned on here that the NWS was better, but if it weighs more, and the mounting points are all the same distance and angle, why would it be different/better?
UK ZXR400 L3 (1993) - Fully restored and on the roads, my green beast!
JPN ZXR250 A2 (1990) - Revs to 19,200rpm... 'nuff said :smt003
zimm
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Re: Alternative shock linkages

Post by zimm »

Better than an L.. H models never came here officially, and were incredibly rare here in the 90's.. so no cheap used linkages about, and no expensive new ones either.. hence the creation/existence of the nws linkage..
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banner001
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Re: Alternative shock linkages

Post by banner001 »

ah now i see.
UK ZXR400 L3 (1993) - Fully restored and on the roads, my green beast!
JPN ZXR250 A2 (1990) - Revs to 19,200rpm... 'nuff said :smt003
Leey
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Re: Alternative shock linkages

Post by Leey »

Just fitted my h linkage shall give it a test ride tomorrow
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banner001
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Re: Alternative shock linkages

Post by banner001 »

H2 linkage:
Distance from swingarm to dog bone bolts: 52mm
Distance from dog bone bolts to shock mount: 62.3mm
Angle equals 57°
All bolt holes are 12mm diameter.

All are center to center.
UK ZXR400 L3 (1993) - Fully restored and on the roads, my green beast!
JPN ZXR250 A2 (1990) - Revs to 19,200rpm... 'nuff said :smt003
zimm
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Re: Alternative shock linkages

Post by zimm »

actually all this is on here from a number of years back,

(does no-one use search anymore ? :smt017 )

AFM327 referencing the PB article on RMKD's bike a few years back

viewtopic.php?f=37&t=7930&hilit=linkage
AFM327 wrote:The PB article listed the differences on the standard linkages. 50/50 for H1, 65/45 for H2 and 60/40 for L.
which with some quick mental arithmetic matches the measurements in the previous post :)

Drew providing part number info on another thread,
Mori Man wrote:The Uni-trak linkage varies between models

39007-1156 for H1/J1 NLA

39007-1189 for H2/J2 NLA

39007-1087 for L1~9 / M1~9 (SP) 8,000 Yen

Dogbones are all the same across models

39111-1087
zimm
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Re: Alternative shock linkages

Post by zimm »

Just had a quick measure up,

H1 linkage:
Distance from swingarm to dog bone bolts: 60mm
Distance from dog bone bolts to shock mount: 60mm

H2 linkage:
Distance from swingarm to dog bone bolts: 52mm
Distance from dog bone bolts to shock mount: 62.3mm

L linkage:
Distance from swingarm to dog bone bolts: 50mm
Distance from dog bone bolts to shock mount: 65mm

NWS LInkage:
Distance from swingarm to dog bone bolts: 52.5mm
Distance from dog bone bolts to shock mount: 62.5mm

so, assuming all other things to be equal..

H1 most linear (and softest?)
L most progressive (rising rate)
NWS/H2 are essentially the same linkage and somewhere in between the other two.

wonder what the linkage on a ZX400G is .. I dont have any ZX4 bits anymore to check but i know they will interchange, and that my ZX4's rear end was a lot more compliant than any standard ZXR ive ridden..
Last edited by zimm on Sat Sep 06, 2014 11:13 pm, edited 1 time in total.
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banner001
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Re: Alternative shock linkages

Post by banner001 »

Cheers zimm, and no it appears that none of the previous 30+ posters checked old posts. Any idea on the angle as well, this affects the rate that the swingarm mover relative to the movement of the shock.
UK ZXR400 L3 (1993) - Fully restored and on the roads, my green beast!
JPN ZXR250 A2 (1990) - Revs to 19,200rpm... 'nuff said :smt003
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