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Cosmic_Jumper
Terry Smith
cello33
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cello33
Maxi-Scooter Rider
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PostSubject: For Forks Sake!   For Forks Sake! I_icon_minitimeThu Nov 03, 2022 6:28 pm

So I last did a fork oil change about 2 years ago and 15000 miles or so hence it's time to do it again. I used 10w before and this helped with my saggy forks but thinking of increasing the weight to 12.5 , is this a good idea do you think?

Just to reiterate I am 80KG and have always cited the forks as the Swings main issue as it bottoms out on all but the smallest of bumps , drain access covers and sleeping policeman, yes its that bad check out my Youtube video if you think i'm exagertaing.

So this time I will measure the springs for the service limit as I guess after 21 years of carrying that bulk the oe springs are bound to shorten a little ......I just measured my forks for travel and this is what i found ...

Off the ground. no weight - 130mm
On the ground, bike weight -95mm
On the ground, bike and rider - 90mm

Houston do we have a problem? I'm not sure but the next time it bottoms out (tomorrow) I will measure the bottom out limit of the forks but I guess its going to be about 40mm and not much more.

I have already tried stacking some washers under the spring and probably around the 10mm so I guess I am taking away some travel for some increased compression so the bottoming out could be even worse.

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cello33
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PostSubject: Re: For Forks Sake!   For Forks Sake! I_icon_minitimeThu Nov 03, 2022 6:32 pm

the vid link, apologies for the profanity but this as before I serviced the forks..

https://www.youtube.com/watch?v=BYCUgyXfeJs
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Terry Smith
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PostSubject: Re: For Forks Sake!   For Forks Sake! I_icon_minitimeThu Nov 03, 2022 11:32 pm

According to the service manual the fork travel is 120mm, and a reasonable rule of thumb is for the bike to use 25-33% of the travel supporting itself and you, so that would be up to 40mm of travel. If I have understood your numbers, you have exactly 40mm travel used so that's a decent start and gives 40mm of extension for the wheel to fall into negatives like dips and holes.

The spring rate plus preload is what will determine whether you bottom out or not on bumps, and you can add more preload (and lose some of that 40mm travel), or you can install stiffer springs, or you can also increase the volume of oil in the leg (or any combination).

The air over the oil inside the leg gets compressed when the fork travels and you can harness more of that compression by reducing the air volume, which will increase bottoming resistance.  The standard oil level is 97mm (forks compressed, springs out) from the top of the tube, but by way of a contrast my ST1300 specifies 62mm air gap.

Boosting the oil weight will provide some more bottoming resistance but you run the risk of harshness if you take that too far.
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Cosmic_Jumper
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PostSubject: Re: For Forks Sake!   For Forks Sake! I_icon_minitimeFri Nov 04, 2022 4:29 am

Here’s a link to a very informative recent discussion regarding front suspension mods you might find helpful.

https://www.silverwing600.com/t12580-fork-springs-mod-poor-mans-hyperpros?highlight=Front+suspension
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GHM-PM
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PostSubject: Re: For Forks Sake!   For Forks Sake! I_icon_minitimeFri Nov 04, 2022 8:25 am

I redid my fork seals a couple of years ago and used 10w oil and it was terrible... That is what the book called for but it was way too soft. I weigh in the 240 lb range. I switched to 15w fork oil and it works OK. Not great as the forks have never been the best but certainly works for me. Good luck.
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terrier
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PostSubject: Re: For Forks Sake!   For Forks Sake! I_icon_minitimeFri Nov 04, 2022 3:01 pm

In the link that Tim posted above, I had asked a couple of questions before going ahead with the Stefan Bonacasa front fork mod. Since then I've done the mod with the extra springs and used 15w Motul fork oil as advised by Stefan. I'ts made a noticeable difference. The front suspension doesn't crash into or bottom out on potholes like it used to. My Swing is now more pleasurable to ride.
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cello33
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PostSubject: Re: For Forks Sake!   For Forks Sake! I_icon_minitimeSun Nov 06, 2022 7:37 pm

cheers will source a spring or make a spacer i think, the washer in the link looks quite expensive all things considered and i guess you could get a 25 pack for the same money at a hardware store...
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K-Hill
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PostSubject: Fork springs    For Forks Sake! I_icon_minitimeMon Nov 21, 2022 9:29 pm

I bought these, I’m 260lbs, love them!
https://epmperf.com/product/fork-spring-kit-honda-fjbs-600-silverwing
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SWingSteve
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PostSubject: Re: For Forks Sake!   For Forks Sake! I_icon_minitimeWed Nov 23, 2022 10:09 pm

K-Hill wrote:
I bought these, I’m 260lbs, love them!
https://epmperf.com/product/fork-spring-kit-honda-fjbs-600-silverwing

Would these be the same for a 2011 FSC600A? I weigh about the same and have had a couple of bottom outs as a single rider. I have no idea if the forks have been touchedby the PO. And if I am going to crack them open I might as well adjust them to my size.
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