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Sportster Motorcycle Suspension, Frame, Forks, Handlebars, Fuel Tank, Oil Tank, Fenders Discuss Sportster Motorcycle Suspension, Frame, Forks, Handlebars, Fuel Tank, Oil Tank, Fenders problems, advice, and/or how tos.

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View Poll Results: What weight fork oil do you use
5w 39 9.44%
10w 87 21.07%
15w 113 27.36%
20w 40 9.69%
30w 16 3.87%
standard weight HD 76 18.40%
Screamin eagle HD 52 12.59%
Multiple Choice Poll. Voters: 413. You may not vote on this poll

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  #121  
Old 19th June 2019
boomerguy boomerguy is offline
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Quote:
Originally Posted by rezchug View Post
It's about mid weight viscosity & lasts longer than fork oil before breaking down.
It lasts longer probably because it's formulated to work in running transmission under constant stress, added bonus is ATF is sold by the gallon.
Good info. Thanks. Since I plan to change my fork oil more often than recommended by the owner's manual (30K mile intrvals) because mine broke down apparently long before 10K miles, I will probably try the ATF.

Interesting fact: Ford car and light truck manual transmissions have been using ATF for decades with no problems and recommended change intervals of 30K. This speaks for itself. I have ATF in my 2002 F-150 5-speed manual right now.
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  #122  
Old 19th June 2019
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Quote:
Originally Posted by boomerguy View Post
Good info. Thanks. Since I plan to change my fork oil more often than recommended by the owner's manual (30K mile intrvals) because mine broke down apparently long before 10K miles, I will probably try the ATF.

Interesting fact: Ford car and light truck manual transmissions have been using ATF for decades with no problems and recommended change intervals of 30K. This speaks for itself. I have ATF in my 2002 F-150 5-speed manual right now.
Yeah ATF is a great fluid that stealerships & even shops hate.
I've been to bike shows where some socallled "experts" would go off on rants about its no good blah blah & I NEED to pay their shop for this $20 per baby bottle or my bike will disintegrate never realizing I'm a mechanic who's used ATF countless times lol
The ATF can withstand heavy pressures repeatedly as I've seen it take from motocross racing, usually when you make a change it seems to have the same viscosity as it did going in.
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  #123  
Old 14th July 2019
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I just changed my fork oil to HD Type "E" Fork oil. It looks, suspiciously like ATF. I wanted to use Mobil 1 Synthetic ATF, but none was readily available in my area. M1 is rated at 7.5W and I thought this would be about the best weight to run, the way I ride.
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  #124  
Old 2nd August 2019
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I just changed my fork oil with the screaming eagle
heavy performance oil. Doesn’t say on the bottle what
the weight is but it was under $8 a pint and readily available
so I bought it. I need to change it more often though.
Last time I changed it was in 2010!
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  #125  
Old 2nd August 2019
boomerguy boomerguy is offline
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Since I change my fork oil @ 10K mile intervals and each one only takes 10 oz - and I only have one bike, I don't consider the price to be a major factor. If I need the money, I'll just skip a trip or two to the local coffee shop or fast food place. (No, I don't skimp on my beer or the brand, so don't even go there.)
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  #126  
Old 20th August 2019
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LOL, you have to love all the threads about "Fluids".... ok ok...

Lets roll...

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  #127  
Old 5th September 2019
51 New West 51 New West is offline
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I fitted Ricor Intiminators so I'm using 5W oil as recommended. Hands down the single best mod I have to any of my bikes, ever. The front end is super planted and comfortable.
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  #128  
Old 4 Weeks Ago
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Quote:
Originally Posted by 51 New West View Post
I fitted Ricor Intiminators so I'm using 5W oil as recommended. Hands down the single best mod I have to any of my bikes, ever. The front end is super planted and comfortable.
This is the key point to this thread. The weight of oil depends on the type of damping you use and what load it is under. 5wt is what is used in Ricor Intiminators because the 5wt oil can flow right through the stock dampener holes without any real restriction and the Intiminators are then able to control damping through smaller orifices. So, using 5wt in stock forks is a really bad idea because it just passes through without giving anywhere near as much damping.

The electronic shocks they designed for Hummers change the viscosity on the fly and the damping immediately adjusts to conditions. Since we can't do that (unless you have hundreds of thousands of free cash laying around) we need to tune the shocks by manually adjusting damping against viscosity in both directions of travel. It's as important as tuning an engine, so I would not recommend just using what someone else has used blindly. Test anything you use over washboards, braking, hard bumps, etc. Be sure for yourself that it's a good choice.
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  #129  
Old 4 Weeks Ago
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For sure, the more sophisticated the damper, the more critical the oil is to achieve a given damping performance.
Damper rods are crude dampers so it is less critical what you use. Shims stacks are another matter.

Bear in mind that going by oil weight is not a very accurate way to determining damping performance.
This is because there is a huge variation in viscosities and Viscosity Indices between different manufacturers
offerings. Far better to use the quoted viscosity to determine which oil you want which is normally in units like Cst
at 40C. Ideally use an oil with a high Viscosity Index (VI) so the damping is more constistent over differing temperatures.
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  #130  
Old 4 Weeks Ago
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Quote:
Originally Posted by Four Speed View Post
Bear in mind that going by oil weight is not a very accurate way to determining damping performance.
This is because there is a huge variation in viscosities and Viscosity Indices between different manufacturers offerings.
ATF viscosity varies even more as there is no standard ATF viscosity. Different types will have considerably different viscosities by design.
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