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while waiting on my parts to come in for the fork rebuild,

i was wondering whats your choice of fork oil for the 1500, atf, 10wt, 15wt and why

also have you guys tried mixing oil weights for finer tuning?

thanks
 

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I guess it depends a lot on how you like it to feel. I like to use ATF. I like the suspension on the soft side and I like the ride using the ATF. It works well for me. Some other guys like a stiffer feel and they use something like the 15w fork oil. Just try one and if you don't like the ride try another. It is easy to change the fork oil if you have the air valves at the top.
 

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ATF is stock and it is @ 7.5 wt. Gives a mushy/very soft ride.
I put in the 15wt fork oil as progressive recommends it with their springs. It has worked well as I ride the twisties lots, and I ride hot and hard into the corners most rides.
I'm due again for a change of fork oil(yearly) and have been thinking of trying some 10 wt this time to check the ride difference on the wing myself, may have to change back but will find out anyhow.
 

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I found 15wt quite a hard ride with Progressives, but I was comparing this to my 1200 with stock (softer) springs. I replaced with 10wt for peace of mind, don't really feel a great deal of difference, but happy with the ride now anyway.
Cheers,
Peter.
 

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I put in ATF in my new to me 88 as that is what the shop manual called for. Way too soft with Progressive springs. The front end would bottom out on any sharp edge bump. Just changed over to 10W but have not had any time to take the bike out and give it a try.
 

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In the past on other Honda bikes with air suspension I tried different fork oil weights. I started with ATF, it was the least expensive and I figured I would dump it and move on. After trying different fork oils I found I couldn't get the ride and response I got I got from the ATF. I ended up refilling the forks with ATF and passing the unused fork oil on to a friend. I found the bike road to hard and was unforgiving. I like the smooth controlled ride I got from the ATF. That's just me.
 

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while waiting on my parts to come in for the fork rebuild,

i was wondering whats your choice of fork oil for the 1500, atf, 10wt, 15wt and why

also have you guys tried mixing oil weights for finer tuning?

thanks
... hhmmm fork-tuning... ? Lemme see, they take oil, right? :wink:

Mr Verdone has done a bit of digging on fork oil weights, including ATFs, which displays measurable properties for several brands; there's a handy refernce table on the bottom of the page here ( link ), which has been retyped here ( link ). I find this second like handy for quick lookups as it supports text searchin where MR. Verdone's original material is presented in a less-searchable format. (I carry this data in my cellphone as an Excel sheet for easy reference)

For myself, I've always been a worry-wart about how the various additives from different products would play together, so I try to avoid mixing. The more realistic part of me knows that creating some caustic foaming componant-etching, seal-eating mess inside my forks is really & truely unlikely, but if it's gonna happen, it'd be in my forks for certain :wink:. With the number of choices available, and the difficulty in exact reproduction of the mixes, I kinda stick to one bottle at a time for whatever fluid I fill with.

To me, all of the fork-oil tuning tricks relate more to understanding that overall fork rates (both compression and extension) are determined by the oil viscosity, and that ONLY the compression rate (and also anti-dive efficacy) are determined by the fill level (higher oil volume is stiffer).

You ask about what oil I would use - I run a few different oils base on the plan for the day, but generally I stay with something that I can find locally and reasonably well nationally. Personal preference is to have an oil that performs the same hot as it does cold (these are the higher values of "VI" on the linked data; I use the recalculated "VI" values).



In short (performance and availability considered):
  1. My 1st choice would be Silkolene Pro RSF (7.5w for touring, 15w for playing with a lower fill level)
  2. My 2nd choice would be Bel-Ray HVI (10w for touring, 15w is ok - but nothing to write home about)
This is on an '88 with Progressive Coils in the front (tight end up) and Progressive 416s with 4.5oz (normal is 2oz) of Mobil1 ATF

I hope that's of some help. It'd be great to hear back on what you found works well for you.
:?​
 

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Has anyone found any problems when changing from ATF to oil?....do they mix OK?

Ed
Do not mix ED. one or the other at one time, flush out the old with a little bit of ATF is OK.

The fork oil needs changing yearly.
 
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