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FJR Motorcycle Forums
FJR Parts & Accessories Discussions
Correct fork oil for 2008 ?
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<blockquote data-quote="Fred W" data-source="post: 853808" data-attributes="member: 3828"><p>Doing a little searching for what the "right stuff" is to be putting into the stock Yamaha FJR forks and came upon this thread. Then I did a little googling outside the forum and made a significant find: Here is a <a href="https://home.comcast.net/~FJR-NERDS/Files/Suspension_Oil_Comparisons.pdf" target="_blank">viscosity comparison graph</a> for a whole bunch of different brands and weights of suspension fluids. The graph shows the viscosity (in centistokes) at both 100 degrees C and (more significantly) at 40 degrees C.</p><p></p><p>You can see the wide viscosity ranges that are called the same "weight" oil by various manufacturers.</p><p></p><p>What is particularly interesting is that the Yamaha 01 fork oil is very low down on the list. It falls between the area that most other manufacturers are calling 5W and 3W. I have printed off the lower portion of this chart and will use it to select an oil that is nearest to the Yamaha 01 oil as possible.</p><p></p><p>I have a feeling that the PO put some sort of 10W oil in when he replaced the fork springs, as my dampening has always been very stiff. I have tried dialing in the ball-park number of clicks as suggested by other forum members and have been way off the mark. I think I now understand why.</p><p></p><p>FWIW - most ATF comes in at ~ 30 centistokes @ 40 deg C and 7-8 centistokes @ 100 deg C, so would fall into the middle of the chart.</p><p></p><p>Anyway, thought I would share my discovery.</p></blockquote><p></p>
[QUOTE="Fred W, post: 853808, member: 3828"] Doing a little searching for what the "right stuff" is to be putting into the stock Yamaha FJR forks and came upon this thread. Then I did a little googling outside the forum and made a significant find: Here is a [URL="https://home.comcast.net/~FJR-NERDS/Files/Suspension_Oil_Comparisons.pdf"]viscosity comparison graph[/URL] for a whole bunch of different brands and weights of suspension fluids. The graph shows the viscosity (in centistokes) at both 100 degrees C and (more significantly) at 40 degrees C. You can see the wide viscosity ranges that are called the same "weight" oil by various manufacturers. What is particularly interesting is that the Yamaha 01 fork oil is very low down on the list. It falls between the area that most other manufacturers are calling 5W and 3W. I have printed off the lower portion of this chart and will use it to select an oil that is nearest to the Yamaha 01 oil as possible. I have a feeling that the PO put some sort of 10W oil in when he replaced the fork springs, as my dampening has always been very stiff. I have tried dialing in the ball-park number of clicks as suggested by other forum members and have been way off the mark. I think I now understand why. FWIW - most ATF comes in at ~ 30 centistokes @ 40 deg C and 7-8 centistokes @ 100 deg C, so would fall into the middle of the chart. Anyway, thought I would share my discovery. [/QUOTE]
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Correct fork oil for 2008 ?
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