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Old 04-22-2008, 03:33 PM   #1
Alstare_Gixxer
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Shimming rear shock

My 03 GSXR 600 has 05 front forks and 02 GSXR 750 Ohlins shock. After I put these parts in, my bike seems to be higher in the rear causing the steering to be quick may be due to change of the rake angle. The difference in length between the 600 and 750 according to spec is only .5 mm . Would shimming the rear shock brings the back end down a bit or do I have to use lowering links?
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Old 04-22-2008, 03:49 PM   #2
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eat more cheese Burgers that should drop the bike down
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Old 04-22-2008, 03:52 PM   #3
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ohlins shock has adjusters for ride height

no need for shims or lowering links
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Old 04-22-2008, 03:55 PM   #4
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Setting the shock absorber length
Sensitivity of the steering can be adjusted by altering the length of the shock absorber, without affecting other characteristics. The length is adjusted using two nuts down and the treaded clevis at the end of the piston rod (Fig.14). The shock absorber can be adjusted up to 12 mm.



Adjusting the shock absorber length
A long shock absorber results in steeper inclination of the front fork (steeper fork angle) and consequently sensitive, quicker steering. A short shock absorber gives a greater angle of the front fork (flat fork angle) and consequently slower and smoother steering. Each complete turn of the shock absorber gives one millimetre (Fig.15). The length may never be altered more than to where the groove (Fig.16) that is cut in the thread becomes just visible under the lower nut of the level brachet. Make small steps and test run.


straight from the ohlins site....http://www.ohlins.com/Motorcycle/Set...9/Default.aspx
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Old 04-22-2008, 10:33 PM   #5
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Quote:
Originally Posted by houseofpain View Post
ohlins shock has adjusters for ride height

no need for shims or lowering links
Thanks Tony, will look at it tomorrow.
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Old 04-22-2008, 10:34 PM   #6
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Quote:
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eat more cheese Burgers that should drop the bike down

I'm blessed to have fast metabolism...I eat all I want but gain not a pound
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Old 04-23-2008, 01:32 AM   #7
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Quote:
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Thanks Tony, will look at it tomorrow.
is it tomorrow yet? Cause I haven't seen you coming by the shop to work on it.
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Old 04-23-2008, 02:05 PM   #8
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Well, looked at the shock today and it doesn't have the shock length adjusting nuts other than the 2 rings on top of the spring that can be adjusted with a c-spanner wrench which I'm not sure will have any effect on the shock length other than the initial spring preload. I think my other option is to use lowering links to get my rear-end down 1-1 1/2 in. and get my steering slow down a bit and more stable. I think my last low-side was resulted from steep rake and tucked the front because I didn't think I was leaning that hard at the Carousel TWS (Texas World Speedway). I also jumped the curb on turn 3 several times because my bike turned in too quick... but that's my observation.
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Old 04-23-2008, 02:07 PM   #9
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try droppin the forks down on the triples yet? or are they flush on the triples already?
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Old 04-23-2008, 02:08 PM   #10
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if you lower the rear, you'll sacrifice some ground clearance as well.
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Old 04-23-2008, 02:35 PM   #11
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ummmm ok if you put a spacer in the back you will only raise the bike more in the back. if your front forks are all the way flush than your pretty much stuck with adjustments unless you put your back axle all the way to the back of the swingarm. you might have to put a bigger chain on it to do that. by doing that it will extend your wheel base which will give you more stability or you can tighten the steering damper if your is adjustable
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Old 04-23-2008, 02:37 PM   #12
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post pictures of the shock and of the forks on the bike
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Old 04-23-2008, 03:10 PM   #13
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Quote:
Originally Posted by Alstare_Gixxer View Post
My 03 GSXR 600 has 05 front forks and 02 GSXR 750 Ohlins shock. After I put these parts in, my bike seems to be higher in the rear causing the steering to be quick may be due to change of the rake angle. The difference in length between the 600 and 750 according to spec is only .5 mm . Would shimming the rear shock brings the back end down a bit or do I have to use lowering links?
I have the same forks on my 03 GSXR 600.(except there off an '04, same as '05) Did the bike feel stiffer to you when you made the change?

Mine did, the only thing I could think of was maybe the forks were too thick for this model's chassis, but I'm no engineer so I can't say for sure.:/:Maybe the rake was a little off? Maybe it was having to use the '04 wheel in the front and an '03 in the rear??

I just wanted to make sure it wasn't something serious like that and maybe just my concious trying to get the best of me.

I've since replaced the springs with a lower spring rate spring from traxxion and added some shims to the top of my shock to raise the rear and raised the tubes just a hair.(which probably fixed the rake problem because it's not so sluggish anymore) It feels fine now I suppose. I just wanted to see if you ever experienced any problems with making the switch on the forks?

It is comforting to know that someone with the same bike has the same forks, and judging by your avatar picture, you seem to be moving pretty well.

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Last edited by RoadracerNC; 04-23-2008 at 03:14 PM.
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Old 04-23-2008, 03:52 PM   #14
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The top of the forks have about 3/8 in. from being flush. I had the same year street bike (before it got stolen) with stock conventional forks and shock and I could flat feet sitting on it (stock seat height is 32 in.). This one with 05 front end and Ohlins shock, I have to tippy toe on both sides, suggesting the seat height must be around 34 in.

I could push the forks flush to the top triple and help solve the rake, but then the bike will be higher which will be a for me to back out of the pit area in a dignifying manner.

The suspension (front and rear) was adjusted by Roger (On Road Off Road) for sag, damping.... and overall still a bit stiff. Ohlins shock has .85 spring which suits my weight (145 lbs with suit on).

My bike is at Level5 shop, and if he reads this thread, he can take a few pics of the shock and post on here for Romeo.
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