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09+ fork oil

3912 Views 20 Replies 10 Participants Last post by  Shadyaj3
Hello all,
I am going to be changing the fork oil (bushings, seals, etc) on my 2009 zx6r. Forks internals are stock, current oil is stock weight. Curious as to know what weight some other racers recommend? Stock 5w or something heavier? I'm 150lbs soaking wet and racing tracks on the east coast so weather is up and down.
Also what do you guys set the foil oil height at and are you measuring before or after ther piston is installed? I have the manual here but trying to try a sense of what some others are doing.
Thanks!
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Here is a thread asking this question last week.

http://zx6r.com/new-users/62564-zx6r-fork-oil.html

Use 5wt oil. Modern forks shouldn't be tuned with oil viscosity. They all work correctly with 5wt oil.

Unless you have some complaint your trying to address, the stock oil height is fine.

Before making any changes from stock you need to evaluate what you have, identify the characteristics you would like to change and then ask specific questions about how to address specific problems. What I like in suspension action may not be what you like. I weight 60 lbs more than you so my settings are going to be different. But, if you have a specific condition you would like to changes, we could point you in the right direction. But, suspension tuning is always going to require testing and trying different settings until you arrive at the ones that best suit you, you track/roads and your riding style.

I just spent last Saturday working on the suspension of my dirt bike. I had a specific condition I had identified (bike wanted to follow the contour of whoops and didn't want to get on top and stay on top of them). I exchanged some emails with the guy that re-valved my suspension, got some suggestions of things to try and went out and tested them for about 3 hours. Ride the loop I like to use for testing, make a change, ride it again, note the difference, make another change, ride it again, not the difference, repeat until you get the best settings. Made big improvement in the condition I was trying to address without doing to much negative to the other aspects of the bikes handling. But, after 3 hours, I'm still not totally satisfied with it. I'm going to exchange some more emails with my runner and then go back out next weekend and work on it some more.

Point being, unless you have some specific condition your trying to address, it's just turning clickers for some blind luck setting you find better.
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Thanks for the response Natbrown, but not really the answer I am looking for.

Any racers or suspension guys feel free to chime in. I'm not looking to tune the forks, that will be done trackside and by a professional. Just looking to see what oil level guys are setting their BPF on the 09+ zx6rs after fully disassembled and if you are setting the level before or after the piston is inserted. Also what fork oil weight you are using.
Thanks all!
bump.
Stock 5w or something heavier?
what do you guys set the foil oil height at

You asked.


Use 5wt oil. Modern forks shouldn't be tuned with oil viscosity. They all work correctly with 5wt oil.

Unless you have some complaint your trying to address, the stock oil height is fine.

He answered.

Is there any particular reason you have a problem with his answer, or are you purposely being obtuse?

Also - why don't you attempt reading the manual that you said you have.
Is there any particular reason you have a problem with his answer, or are you purposely being obtuse?
Duh!

He wanted an answer from a racer or a suspension guy. Read the question properly, Sandy!

/sarcasm
Sandman thanks for the reply.

NatBrown, did partially answer my question, that is why I said thank you for the response.
I am asking other racers and pro suspension guys to chime in because that is what I plan on doing with the bike, race it. I do not know many racers that run their bikes at stock specs / set ups if they can afford not to. Not being obtuse, and yes I know what the manual says, that is the reason for my questions. I am trying to get a sense of how some other racers are setting up their bikes.

thanks again.
thanks badgerninja, I tried to make the " racer or a suspension guy" stand out but I guess I should have made it bold like you did.

thanks again.
Racing since 1986
Racers setup: change fork spring for your weight, you can buy single springs from
Kawaski.
Download the race manual and you will find the part numbers for the alternate springs.
You can install two different springs, they don't d
need to match. Do the math if you have a stock 9.5 in one fork and install a 9.0 in the other you will have 9.25.
The forks in the triple, drop them level with the triple. This is still not enough for this bike.
Installing an aftermarket kit will lengthen the fork. so never use another racers fork height measured from the top of the triple to the top of the fork. Always measure centre of front axel to bottom of triple. Thats the number that matters.
Fork Fluid use maxima 5wt. measure oil height with spring in and sealed out and outer fork is collapsed on inner.
Start at 100mm or 110mm. Go ride, keep notes. adjust. This is a learning experience, it may take you the entire race season before you get it where you want it. Be safe have fun!
thanks 66proof.
Wait, you thank him for telling you exactly what I told you because he prefaced it by saying he has racing experience. You don't even know if it's true or not. Nor did you ever ask if I had racing experience or had worked on race bikes.

What a knob.

Your welcome by the way.
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Wait, you thank him for telling you exactly what I told you because he prefaced it by saying he has racing experience. You don't even know if it's true or not. Nor did you ever ask if I had racing experience or had worked on race bikes.

What a knob.

Your welcome by the way.
Yeah, well, what do you know?!?!? :nana:

All I know is how to print a shipping label and send mine to Thermosman. :D
Natbrown, my first words in respone to you was thank you for the response. Wether you have racing experience or not, I have no idea, I still would have replied that wasn't the answer I was looking for. I even said thank you to Sandman because you did partially answer the question.
I am looking for specific numbers in which the oil level is applied and how others are measuring in which 66proof gave.
That doesn't make him right or wrong but more of what I am looking for.
But thanks for the reply, again.

Me, knob, oh well. Thanks.

Low cel, thanks for you response too.
Racing since 1986
Racers setup: change fork spring for your weight, you can buy single springs from
Kawaski.
Download the race manual and you will find the part numbers for the alternate springs.
You can install two different springs, they don't d
need to match. Do the math if you have a stock 9.5 in one fork and install a 9.0 in the other you will have 9.25.
The forks in the triple, drop them level with the triple. This is still not enough for this bike.
Installing an aftermarket kit will lengthen the fork. so never use another racers fork height measured from the top of the triple to the top of the fork. Always measure centre of front axel to bottom of triple. Thats the number that matters.
Fork Fluid use maxima 5wt. measure oil height with spring in and sealed out and outer fork is collapsed on inner.
Start at 100mm or 110mm. Go ride, keep notes. adjust. This is a learning experience, it may take you the entire race season before you get it where you want it. Be safe have fun!
Why would you want to raise the front end of the bike by lowering the fork or installing longer forks!? This would make turn in slower. Dave Moss recommended raising the forks in the triple by 5mm for this bike to quicken turn in.
I use 10 weight. I think the 2013+ went to 10 wt.
Why would you want to raise the front end of the bike by lowering the fork or installing longer forks!? This would make turn in slower. Dave Moss recommended raising the forks in the triple by 5mm for this bike to quicken turn in.
Dave is correct raise the forks in the triple and entry to a turn will be quicker.
Dropping the forks in the triple would be best for the original poster, he is going racing. The forks will be fully compressed on braking and will remain compressed while trail braking (although not as compressed).
The fork compresion under braking gives you quicker turn in.
I have tried what Dave Moss has suggested on my own 09 ZX6R. On the race track it turned in great but had trouble finishing a turn on exit. Once the bike was stood up and on the gas exiting a turn it was twitchy somewhat unrideable at speed, therefore providing no confidence and terrible lap times.
But everybody has choices to make, everyone needs to decide what they like.
I like the bike tall in the front, 2 mm of shock length added and a massive 200/55/17 rear tire with a diameter of 657 mm (the tire itself raises the back).
That makes me happy.
If you are racing and what me to post a nice flow chart for tuning suspension let me know, i will post it here.
See less See more
Dave is correct raise the forks in the triple and entry to a turn will be quicker.
Dropping the forks in the triple would be best for the original poster, he is going racing. The forks will be fully compressed on braking and will remain compressed while trail braking (although not as compressed).
The fork compresion under braking gives you quicker turn in.
I have tried what Dave Moss has suggested on my own 09 ZX6R. On the race track it turned in great but had trouble finishing a turn on exit. Once the bike was stood up and on the gas exiting a turn it was twitchy somewhat unrideable at speed, therefore providing no confidence and terrible lap times.
But everybody has choices to make, everyone needs to decide what they like.
I like the bike tall in the front, 2 mm of shock length added and a massive 200/55/17 with a diameter of 657 mm (the tire itself raises the back).
That makes me happy.
If you are racing and what me to post a nice flow chart for tuning suspension let me know, i will post it here.
I'm not racing but always interested to see what works for others, please post.
Why would you want to raise the front end of the bike by lowering the fork or installing longer forks!? This would make turn in slower. Dave Moss recommended raising the forks in the triple by 5mm for this bike to quicken turn in.
While traditional logic with race bikes is to raise the rear and drop the front, the kawi is different/weird.

As a practical example, when I was riding at Summit Point last year, I had my forks set at 4-5mm (I forget, I'd have to look at notes). I was getting headache causing head shake out of every damn corner. I had to run them flush just to ride the bike with any sort of pace. It was better...until I started going even faster and the shake was back. Luckily, I found cartridges for dirt cheap (thanks WERA classifieds). It is internally lengthened now.

At OP, our bikes respond well to suspension upgrades. Throw a shock on and gold valves and you will be the only limiting factor.
Dave is correct raise the forks in the triple and entry to a turn will be quicker.
Dropping the forks in the triple would be best for the original poster, he is going racing. The forks will be fully compressed on braking and will remain compressed while trail braking (although not as compressed).
The fork compresion under braking gives you quicker turn in.
I have tried what Dave Moss has suggested on my own 09 ZX6R. On the race track it turned in great but had trouble finishing a turn on exit. Once the bike was stood up and on the gas exiting a turn it was twitchy somewhat unrideable at speed, therefore providing no confidence and terrible lap times.
But everybody has choices to make, everyone needs to decide what they like.
I like the bike tall in the front, 2 mm of shock length added and a massive 200/55/17 rear tire with a diameter of 657 mm (the tire itself raises the back).
That makes me happy.
If you are racing and what me to post a nice flow chart for tuning suspension let me know, i will post it here.
This.

I did try once what an expert racer suggested that had the same bike. Shit felt god awful.
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