Stock GSX-R 600 k8 suspension help

[dipshit]

Have been having a bit more of a tweak on my 600's suspension today. It is all stock apart from re-springing the rear shock from a 9.4kg down to a 8.5kg spring to suit my 78kg weight better. The change in spring certainly improved things and i no longer get my backside launched out of the seat on any decent bumps.

I have backed off compression damping a bit at both ends too (more so the rear) to see if any improvement again can be had. The bike now feels more stuck to the road than the harsh skipping/floating along the top of the road surface feeling it had before.

But there is still a harsh feeling from the rear shock that doesn't seem quite right yet. I have been backing off rebound on the rear quite a bit, but it doesn't seem to be making much of a difference yet. There is still a feeling the rear end is pumping down over a quick series of bumps.

My question is should i keep reducing rear rebound... or is this some limitation in the standard shock and i should look at getting a re-valve... or am i on the wrong track altogether with my settings..???

Any advice would be appreciated.

[Pussy]

I can't really give you any advice on the stock shock, dipshit.
I would advise, however.... a TTX36. They are very compliant and controlled.
I think RT has revalved a stock K6-K9 600/750 shock, but I don't know how it performed.
I have only done about 400km on a stock shock in my 750, and I didn't like it that much


Edit: The bike felt "wooden" with the as delivered shock on it

[Morcs]

I hate the fact im helping you but...

Drop the forks so about 5mm sits above the top clamp.
Front preload - about 8 turns out from fully in (from stiff end of scale)
Front rebound - 1 turn out from fully in (from stiff end of scale)
Front compression - 2 turns out from fully in (from stiff end of scale)

Rear, given the change of springs, have about 6mm of thread showing.
Rear rebound - about 2 and a half turns out from fully in (from stiff end of scale)
Rear low speed compression - 1 and a half turns out from fully in (from stiff end of scale)
Rear high speed compression - 3 turns out from fully in (from stiff end of scale)

Dial those settings in and see how it goes. Its a definate good starting point for fine tweaking

[dipshit]

I can't really give you any advice on the stock shock, dipshit.
I would advise, however.... a TTX36. They are very compliant and controlled.

That would be an option before i threw too much money at the standard shock.

Edit: The bike felt "wooden" with the as delivered shock on it

That's a very good description of the feeling i'm experiencing too. It's not responding very well to damping changes.

[dipshit]

Dial those settings in and see how it goes. Its a definate good starting point for fine tweaking

Thanks. At least i can compeer these against standard settings and what i have done to see if i have ended up going down the wrong path.

However it looks like my settings are quite close or heading in the same direction as those.

[dipshit]

I hate the fact im helping you but...

Drop the forks so about 5mm sits above the top clamp.
Front preload - about 8 turns out from fully in (from stiff end of scale)
Front rebound - 1 turn out from fully in (from stiff end of scale)
Front compression - 2 turns out from fully in (from stiff end of scale)

Rear, given the change of springs, have about 6mm of thread showing.
Rear rebound - about 2 and a half turns out from fully in (from stiff end of scale)
Rear low speed compression - 1 and a half turns out from fully in (from stiff end of scale)
Rear high speed compression - 3 turns out from fully in (from stiff end of scale)

Dial those settings in and see how it goes. Its a definate good starting point for fine tweaking

Actually it looks like these are just Sport Rider's suggested settings ... but thanks anyhow.

[Morcs]

Actually it looks like these are just Sport Rider's suggested settings ... but thanks anyhow.

Heheh smart guy

They have a tendancy to work...

[crazyhorse]

Morepower helped me set my suspension up. We took it back to factory standard, and I've wound in the front abit (don't think we ended up touching the rear on it)

But yeah I still occassionally have my arse leave the seat over some bumps (but you get that at over 200 km/h), but nothing like it used to. PM him for advice, he's fairly good at that sort of guff.

[Toot Toot]

Just PM Shaun (thats his name on here) of Motodymamix. I have a K8 750, and he sorted it sweet as.

[Pussy]

It's not responding very well to damping changes.

I think a lot of the "adjustment" you can do to the stock shock is more a cosmetic thing. The adjusters look good!

The stock shock has a rubber bladder type thingie for separating the gas and the oil in the reservoir.... and the gas ends up emulsifying itself in to the oil. This can make adjustments null and void too

[dipshit]

The stock shock has a rubber bladder type thingie for separating the gas and the oil in the reservoir.... and the gas ends up emulsifying itself in to the oil. This can make adjustments null and void too

This wouldn't be the case on a shock with olny 2000 kms on it, would it?

[Pussy]

This wouldn't be the case on a shock with olny 2000 kms on it, would it?

Yep, it can be!
RT would be worth a call, dipshit.
Not just to buy a new TTX, either

[Shaun]

This wouldn't be the case on a shock with olny 2000 kms on it, would it?

When is your next track day< I may be able to lend you a set of modofoed forks as well as a modified Shock? Might be able to! PM me details please

[Pussy]

With any luck, dipshit, RT may pipe up and give you the gen on the internals of the stock shock

[Robert Taylor]

The shock is likely riding too low in its stroke so its getting to the rising rate part of the rear linkage curve too readily. Also the stock piston inside that shock maxes out in port area flow rate at relatively low velocities so revalving is not going to 100% successfully fix that issue. A Race Tech piston will make a huge difference as the port area flow rate closely mimics the more liberal flow characteristics of an Ohlins piston. It will also end up that the external clickers will end up with a half decent response range.
The front end seriously lacks high speed rebound damping control and we have modified in excess of 20 sets of these now. Id take up Shauns offer to try a set.
Be wary of suggested external settings from especially US mags, they ride on predominantly smooth roads and dont so much get the same frequency of suspension control issues that we do here on our rugged poorly maintained roads