August 19th, 2019, 05:19 AM | #1 |
ninjette.org member
Name: Frank
Location: Maine/Nova Scotia
Join Date: Sep 2016 Motorcycle(s): many! Posts: 107
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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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August 19th, 2019, 06:38 AM | #2 |
Rev Limiter
Name: Jay
Location: WI
Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot.
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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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August 19th, 2019, 10:22 AM | #3 |
ninjette.org member
Name: Frank
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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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August 19th, 2019, 11:01 AM | #4 | |
Rev Limiter
Name: Jay
Location: WI
Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot.
MOTM - Jun '18, Oct '16
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Quote:
I'm sure someone will chime in with a recommendation for oil weight and height. |
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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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August 19th, 2019, 03:49 PM | #6 |
ninjette.org guru
Name: Pat
Location: SW VA
Join Date: Feb 2015 Motorcycle(s): 286, 296, 599, 799 Posts: 436
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.9 racetech spring and 20wt with a 200# rider
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September 1st, 2019, 05:11 AM | #7 |
ninjette.org sage
Name: Timm
Location: West Seneca, NY
Join Date: Oct 2015 Motorcycle(s): 2006 1050 Speed Triple, 2010 250 Ninja racebike, YZF320RR? Racebike Posts: 556
MOTM - Nov '15
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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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September 1st, 2019, 01:16 PM | #8 |
ninjette.org member
Name: Frank
Location: Maine/Nova Scotia
Join Date: Sep 2016 Motorcycle(s): many! Posts: 107
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