What weight fork oil for our bikes? - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 7 (permalink) Old 04-30-2019, 07:43 AM Thread Starter
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What weight fork oil for our bikes?

Anyone know what the manual calls for?
Are you running a different weight?

I am about 280 pounds so I wonder if going a little thicker than the book would be better.
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post #2 of 7 (permalink) Old 04-30-2019, 09:40 AM
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Hello Zzman the manual says you should use Showa SS-8 oil , which is SAE 10 and 36.5 [email protected] or an equivalent , about using a heavier oil it sounds logical that it will flow slower thus damping more , but I'm not sure how it will affect the overall ride .
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post #3 of 7 (permalink) Old 04-30-2019, 10:18 AM
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I did 5 weight, but you can also use 10 weight

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post #4 of 7 (permalink) Old 04-30-2019, 10:49 AM
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Heavier oils will slow the damping and rebound, and adding or subtracting oil level (changing the air gap) will effectively change damping progression and bottoming out. Not a deal breaker for a cruiser.

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post #5 of 7 (permalink) Old 04-30-2019, 02:06 PM
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if you feel that yhe front is "too mushy" a heavier oil will stiffen it up. i like the front to be a little more responsive. there is no standard for fork oil wt. one mfg 10 wt may be the same viscosity as another mfg 5 or 15.

i use maxima brand (be sure to use the non-racing line!!) only just because i know their 10 wt is approx showa ss-8. i like maxima 15 wt.

google "fork oil viscosity comparison" several charts should come up that you can use if you want to compare brands and their various viscosities.

i strongly recommend taking the forks off, turning them upside down to drain and pump them to get ALL of the old, acidic oil out. fill w/ a small amount of new oil, pump, and turn over/pump again to get all of the sludge out. i know kawi does not even have it on the maint schedule, but i do this every 2 - 3 yrs.
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post #6 of 7 (permalink) Old 04-30-2019, 03:21 PM Thread Starter
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Yes, I think my is a little mushy. I put on the front brake and can easily compress the shocks.

That is what I was looking for. I want at least a 10 weight and maybe a 15 weight it sounds like.

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post #7 of 7 (permalink) Old 05-01-2019, 06:52 AM
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You can buy progressive front fork springs as well for about $150 if you want to stiffen up the front

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