Fork oil change recommendation - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 20 Old 10-24-2019, 12:38 PM Thread Starter
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Question Fork oil change recommendation

Hi everyone,

I have a novice question today, I was wondering when it's advisable to change the fork oil? I just bought a 09 650 V-strom (8k mileage) and was wondering whether the fork oil change is more related with the age of the motorcycle or the mileage (or both)?

Thanks in advance for your replies!
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post #2 of 20 Old 10-24-2019, 12:43 PM
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There are those that will recommend a few year interval. I don't get around to it often on my bikes. i know it can get right funky after a number of years.
It's a bit of a bother but it will help the bike ride better.
On my 04 wee I've done one side when I replaced a blown seal. Changing viscosity can help with how the fork feels too depending on your weight and riding style.
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post #3 of 20 Old 10-24-2019, 02:12 PM
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Notacop is right your old oil will stink and a change will help.

Now the problem is oils aren't oils, a 10w in one brand will be different to a 10w in another brand so you have some reading ahead of you.

I used (ATF) automatic transmission fluid in my 09 Wee and I was happy with the results.

All my farm bikes also get ATF, it lasts longer than fork oil and seems to stay behind the seals better, EG: less leaks past old seals.
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post #4 of 20 Old 10-24-2019, 02:15 PM
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If you have the skill set or a friend to with the skill set assist go for it.


It also a excellemnt time to upgrade the fork internals if you want too and have the guap to do so. Springs rated for your weigh and riding style coupled with some fork inserts (Ricor and/or Gold Valve) and matching fork oil and fork brace will greatly improve and somewhat modernize the front suspension. Be forewarned once done this will then expose how the rear shock and spring need reworked to match the front.
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post #5 of 20 Old 10-24-2019, 02:41 PM
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The forks are fairly well sealed. I find most contamination is metal from the springs rubbing on the tube walls. If water works its way past the seals that metal turns to rust and the oil goes funky. Small amounts of dirt and bug guts will work their way through and add to the soup. It is a bit of a project to do so I like to do it in the winter when I can. 8 thou is not that much mileage but 10 years is a lot of time. I would change it, if there is a bit of water in there other parts can rust. After changing, the oil will be at the correct level and weight, and your ride should improve.

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post #6 of 20 Old 10-24-2019, 04:17 PM
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Here's a fork oil comparison chart.
Attached Images
File Type: jpg Fork Oil 1.JPG (151.8 KB, 33 views)
File Type: jpg Fork Oil 2.JPG (125.6 KB, 21 views)
File Type: jpg Fork Oil 3.JPG (118.3 KB, 19 views)
File Type: jpg Fork Oil 4.JPG (121.9 KB, 19 views)
File Type: jpg Fork Oil 5.JPG (118.3 KB, 20 views)
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Last edited by Big Boy; 10-24-2019 at 04:21 PM.
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post #7 of 20 Old 11-20-2019, 08:25 AM Thread Starter
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Thank you everyone for your inputs!
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post #8 of 20 Old 11-21-2019, 02:59 AM
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Have you read https://blacklabadventures.com/2012/...nt-fork-seals/? Useful info even if you are not replacing the seals.
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post #9 of 20 Old 11-21-2019, 10:01 AM
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My Experience

When I changed/upgraded the fork springs on my ZRX, I went with 1.1 Kg springs and 15 weight oil. Massive improvement. Note: I weigh 265 lbs which is at least 275 lbs when I geared up.

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post #10 of 20 Old 11-21-2019, 04:45 PM
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I generally do it in conjunction with a front tire change. With the wheel off I'm already half way to have to having the forks in my hand, so it's the logical time to do it.

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'07 DL650, '01 DR-Z400S, '99 SV650 (race bike), '80 GS1000S, '85 RZ350, '08 Ducati 848
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