JamesW
JamesW
What weight/viscosity fork oil. Any particular brand.
fork oil
- Thread starter JamesW
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10w ...I think this is in FAQ.
If not, it might be on the FJRTech "Maintenance" writeup.
If not, it might be on the FJRTech "Maintenance" writeup.
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MCRIDER007
Well-known member
Honda SS-7, same viscosity (5 wt) as the Yamaha 01 but only costs $6.00 a pint....you will need 3 pints.
However, if you have the GP Suspension fork rebuild then you should use a heavier oil, something closer to a 7 wt because that is what Dave used when he developed the damping pistons.
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Might be, but that would be wrong. It's much closer to a 3 weight oil. But, if one is looking to bias their damping in that direction, it might be a good choice. It all depends on your goals.
The SS-7 is a bit heavier than the Yamaha 01, but not horribly so. Here's the chart of cold and hot viscosities that will allow you to make a more educated choice. clicky
MCRIDER007
Well-known member
I haven't seen that chart, the one I use is at the bottom of this page:
https://www.peterverdone.com/archive/lowspeed.htm
GP Suspension used 5wt Motorex fork oil to develop their damping kits and recommended something close to that viscosity for fork oil replacement.
It's the same guy, so it should be similar data.
The main take-away, if there is one, is that "weight ratings" are totally ambiguous, so you should not pay too much credence to them. IOW, one company's 5W is another's 10W, is another's 3W.
The main reason it is at all important to select carefully is that not all suspension parameters are adjustable, so as an example: on the FJR forks we can adjust the compression and rebound on our forks, but that is only the slow speed damping. High speed adjustments will be more or less selected by the fork oil you choose.
The main take-away, if there is one, is that "weight ratings" are totally ambiguous, so you should not pay too much credence to them. IOW, one company's 5W is another's 10W, is another's 3W.
The main reason it is at all important to select carefully is that not all suspension parameters are adjustable, so as an example: on the FJR forks we can adjust the compression and rebound on our forks, but that is only the slow speed damping. High speed adjustments will be more or less selected by the fork oil you choose.
Afast03nNJ
Well-known member
Go with heavier oil then stock. Makes the bike feel more planted, absorbed bumps better without any noticeable decrease in ride comfort. Actually I think the ride on the highway improved a bit with the heavier oil. I'm running sae 15
Wow thanks for the chart... that's great. Good timing on this thread. I am going to do a fork oil change next month. Stock is 5W? Wow. What's the right weight oil for 200# rider? 7-10W?
Stock is technically a 3 weight oil. If you choose one of the lower viscosity oils somewhere a bit higher on the chart than the Yamaha oil, you;ll be fine. You'll have to back the clickers out to compensate for the heavier oil, but you should still be able to find a happy place. . If you put a REAL 10W oil in it will feel like a brick with the clickers backed all the way out.
Of course some people like bricks
Of course some people like bricks
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