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Discussion Starter #1
My bike is a 2005 zx10r.The suspension components are all stock.The fork has 20mm more oil.I was using at first 190/55 rear,raised the rear of the bike 10mm and lowered the front 10 mm.I ve later installed 200/55 rear,and lowered the rear of the bike by 5mm(to compensate for the new tire`s increased height).Was advised to use the tires at 27-30psi at the front(warmers)and the rear 24-27psi(warmers)The tires are Pirelli Diablo Supercorsa`s,SC2 front and SC1 rear.Have sag at 30mm front and rear.The track is short and a bit bumpy.Was bottoming out at braking,that`s why i m using more oil in the forks.I wanna get some secondhand shocks and fork at some point to send them for a fresh up and a revalve,but for now i m trying to adjust my stock parts as best as i can (until funds allow to buy the parts and send them overseas,cause i dont want to send mine and not be able to use the bike for a month or so)
Track temp was in the 30`s celsius.I`ve attached a pic of my rear tire,maybe you could shed some light :) REAR-1.jpg
 

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Sounds like you've got 2 problems. First your bottoming out issue. In your particular situation adding more oil wont really help you in your issue. You have a couple things you can play with; add more compression, add more preload to your forks so you travel higher in the stroke, change to a thicker oil, and/or change your valve stack.

As to your tire wear that looks like a spring problem with your shock. Usually when you get a V like that it's a spring issue.

Being that it sounds like you're having issues front and rear I would start by double checking that your sag is correct and go from there.
 

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Discussion Starter #3
I checked sag on Friday,cause i had practice on Saturday and race on Sunday.I got it at 30mm front and rear.At the front the preload is full in,but since i got the oil level higher i m not bottoming out.At the front i ll need springs at least,but the rear is more of a trouble,cause is killing the tire.The tire on the pics has 3 20min sessions practice,1 10min qualify and 20 min race
 

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Yeah by the picture your tire is doing all the work for the suspension. Did you measure sag with the suspension hot or cold? How much preload is on the shock? Whats your free sag look like? Also how is the bike exiting the turns? Are you getting any wheel spin?
 

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Discussion Starter #5
Checked sag with the shock cold.Free sag was a bit over 10mm.Exiting the turns,the bike spins,i have to get it upright to give good power to it.And on the bumpy parts its like the rear is dropping itself in the bump.Dont know how to explain it better
 

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where are you racing? there should be a suspension specialist at the track. go see him/her, your suspension is all sorts of jacked up just from what you say you did to it. your bike is unhappy cuz you fuckered with it incorrectly. the suspension guy will dial it in exactly how it needs to be and tell you exactly what to do to upgrade it for your riding style as well as be able to interpret what you're saying
 

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Like nakedinseattle said you might be better off taking it to tuner. 10mm is a lot of free sag. And the excess spin is probably too much anti squat from raising the bike too high in the rear. And your rebound looks a little off from your picture so your shock might be packing because of rebound OR you might have to bump your compression up.
 

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For expert advice on tire wear/suspension I recommend http://www.feelthetrack.com/ Between the videos & blog most of your questions should get answered. You could also email pictures of your tires to Dave and he'll respond with possible solutions to your problems.
 

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Ok you have 2 things see . The first is rebound tear and the second is Hot tear. Your temps are crazy. Start with setting sag. If you have 10mm of free sag, your spring is too hard. Secondly. The stock shock is garbage. Its not what people want to hear. I know I resisted for 3 years until I stopped me from getting faster and I chewed up enough tires that I threw up. Last hot off the warmer temps on the pirellis should be 28F 26R and after a lap or two you want to be around 30f 28R. This is only a base line. You may have better luck with slighty different numbers. To be honest I never liked the Pirelli's b/c the carcass was too soft for the 10r. They stick but I ate tires all day. Especially on stock suspension. The Bridgestones stood up way better. It may be time to spend $$$ on a proper suspension. The clearances in the stock shock are so large that once the shock heats up it will pogo even with the right valving.
 

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ps on my oem shock had rebound 1/4 turn out and compression was pretty far in too just to get ok damping and I had a mountain of shims. I had a 2nd gen.
 

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Discussion Starter #11
I`ve worked on with the tire wear,am using slicks now.i figured what was wrong,i remeasured sag with a hot shock and all the damping backed out all the way,set that,and did the same on the front.at the end i backed out the rear rebound adjuster,and made the front comp a bit slower.my slicks are really clean with 6 20min sessions so far.am riding in the fast group,keep getting the fastest lap times these tasl 2 trackdays,so i m happy with it for now 2012-09-29 12.44.58.jpg

2012-09-29 12.45.24.jpg
 
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