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Old August 19th, 2019, 05:19 AM   #1
Frank06
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[2015 Ninja 300 ABS] Fork Oil?

What are folks doing for fork oil in these bikes? I don't think mine has ever been changed, ~2800 miles race/track day only so it's been used and abused. I'd appreciate thoughts on oil weight/viscosity, level, etc.

TIA
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Old August 19th, 2019, 06:38 AM   #2
jkv45
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I'd look into replacing the stock springs also. Get the proper rate for your weight and application and you'll be a happy camper.

Normally the spring manufacturer will have a suggestion as to the viscosity and brand they like. Surprisingly, the actual viscosity of the same weight fork oil can differ significantly from one manufacturer to another. Typically it's 15 or 20 weight, measuring from the top of the tube with the forks empty and compressed instead of using a measured amount.

If you find someone that really know how to set-up the forks I'd follow their recommendation for springs/oil/amount.
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Old August 19th, 2019, 10:22 AM   #3
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Thanks - the bike was set up originally as a spec racer for a Kawasaki Canada lightweight series and has a Accelerated Technologies K-Tech kit. I'm right at the limit for the springs but I can't detect any bottoming so it seems to be okay. I'm trying to reach out to A.T. but so far no response. I was wondering if going a bit lighter (10?) but more oil than stock wouldn't be a good thing to try. I'll keep trying I guess...
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Old August 19th, 2019, 11:01 AM   #4
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Quote:
Originally Posted by Frank06 View Post
Thanks - the bike was set up originally as a spec racer for a Kawasaki Canada lightweight series and has a Accelerated Technologies K-Tech kit. I'm right at the limit for the springs but I can't detect any bottoming so it seems to be okay. I'm trying to reach out to A.T. but so far no response. I was wondering if going a bit lighter (10?) but more oil than stock wouldn't be a good thing to try. I'll keep trying I guess...
I wouldn't think you would want anything less than 15 wt, and more likely 20 for the track, but not sure. We have always run 15 wt on the street.

I'm sure someone will chime in with a recommendation for oil weight and height.
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Old August 19th, 2019, 02:21 PM   #5
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I have K-tech fork-springs and Razor-R rear shock on my race bike. I change fork-oil in winter between seasons (about 50 days @ track per year). I could probably go 2 seasons per change as the rate of decay is not very quick.

Factory fork-oil is 15w and rebound-holes in damping rod is designed for that. If you have stiffer springs than stock, heavier oil should used. Especially if you use more oil volume (less air) than stock as this adds to "springiness". I use 0.85k springs and settled on 17.5w oil.
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Old August 19th, 2019, 03:49 PM   #6
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.9 racetech spring and 20wt with a 200# rider
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Old September 1st, 2019, 05:11 AM   #7
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If it has a Ktech cartridge kit DO NOT put 20w oil in it as it is probably a 10w oil needed. Call Orient Express and ask them as they sell the kit for your bike:

https://www.orientexpress.com/p-2031...artridges.aspx
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Old September 1st, 2019, 01:16 PM   #8
Frank06
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Quote:
Originally Posted by tgold View Post
If it has a Ktech cartridge kit DO NOT put 20w oil in it as it is probably a 10w oil needed.

To confirm this, I did get in touch with K-Tech and they confirmed the use of 5W oil.

Thanks everyone!
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