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post #1 of 7 Old 09-06-2014, 05:56 AM Thread Starter
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Fork springs

I have reverted back to OEM fork springs (2007 650 ) which are, as we now all know, on the soft side for most riders. The .90kg springs I had installed are far too heavy for my 82 kgs, little luggage and always solo. I have emulators which work well but for the sake of more fiddling I ponder with the thought of replacing some or all of the spacers with cut sections from the .90 kg springs.
This would act as a dual stage spring even tho the OEMs are progressive and the .90kgs are straight wound.
Has anyone here already played with this type of setup and if so was it successful? I'm thinking of adding the cut sections to the top of the originals.
Although I plan to sell the bike this summer I'd still enjoy the exercise for someone else to benefit from.
What thoughts out there?

Saturn 5
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post #2 of 7 Old 09-06-2014, 08:54 AM
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Quote:
Originally Posted by saturn 5 View Post
I have reverted back to OEM fork springs (2007 650 ) which are, as we now all know, on the soft side for most riders. The .90kg springs I had installed are far too heavy for my 82 kgs, little luggage and always solo. I have emulators which work well but for the sake of more fiddling I ponder with the thought of replacing some or all of the spacers with cut sections from the .90 kg springs.
This would act as a dual stage spring even tho the OEMs are progressive and the .90kgs are straight wound.
Has anyone here already played with this type of setup and if so was it successful? I'm thinking of adding the cut sections to the top of the originals.
Although I plan to sell the bike this summer I'd still enjoy the exercise for someone else to benefit from.
What thoughts out there?

Saturn 5

Replacing spacers with sections of springs will make your overall rate softer, not stiffer. It also won't be dual rate, it with be exactly like the stock springs, just a bit softer.
To do what you're envisioning, put the 0.90s in and replace sections of spacer with cut sections of the stock springs.

It's not the springs though causing what you feel as stiffness. I'm lighter than you (72kg) and run 0.90s, the ride is nice and comfy.
There are a few things that can cause that stiff feeling. Too much preload (to little sag), too high an oil level, oil that's too thick, bad emulator setup...

Rich Desmond
'07 DL650, '01 DR-Z400S, '99 SV650 (race bike), '80 GS1000S, '85 RZ350, '08 Ducati 848

Last edited by RichDesmond; 09-06-2014 at 09:00 AM.
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post #3 of 7 Old 09-06-2014, 10:14 AM
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I have to agree with previous post. I weigh 85kg, ride solo with no luggage and have 0.90 springs. Front is perfect. I have 10 wt oil and recommended oil height.

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post #4 of 7 Old 09-06-2014, 02:19 PM
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180#...82kg...and 0.90 are just right. Set the sag to about 40 mm, front & rear, test ride. If that's still too stiff, adjust the emulators. The cartidge emulators are valves which regulate how fast the damper can compress. That's what you need to adjust. The fork oil viscosity is part of the whole package--oil, valves, springs all work together.

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post #5 of 7 Old 09-07-2014, 02:37 AM Thread Starter
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Thanks for the replies and that all makes sense to me now. When I added the .9kg springs I didn't alter the emulators or oil viscosity from what I'd had with the Oem springs. Forgotten now .48kgs? I had previously changed the oil to a shandy (mix) of approx 12 wt looking for 'perfect'. I had tried many combinations and had gotten close to what I was looking for ( compliant but still sure footed) but was not happy, it could be better even for damper rod design. I added the .9 kgs and it was worse and walked away to look at it another day.
So now with a clearer head I know what to do. Ha! I think.
Many thanks.
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post #6 of 7 Old 09-07-2014, 10:29 AM
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Quote:
Originally Posted by saturn 5 View Post
Thanks for the replies and that all makes sense to me now. When I added the .9kg springs I didn't alter the emulators or oil viscosity from what I'd had with the Oem springs. Forgotten now .48kgs? I had previously changed the oil to a shandy (mix) of approx 12 wt looking for 'perfect'. I had tried many combinations and had gotten close to what I was looking for ( compliant but still sure footed) but was not happy, it could be better even for damper rod design. I added the .9 kgs and it was worse and walked away to look at it another day.
So now with a clearer head I know what to do. Ha! I think.
Many thanks.
Stock springs are ~0.75. I'd put the 0.90s back in, go to 10w fork oil and take a turn out of the emulator preload.

Rich Desmond
'07 DL650, '01 DR-Z400S, '99 SV650 (race bike), '80 GS1000S, '85 RZ350, '08 Ducati 848
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post #7 of 7 Old 09-08-2014, 08:55 AM Thread Starter
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Thanks Rich Desmond, that was to be my plan of attack. It's time I got back to working on the Wee again. I have hardly turned a wheel on it since before last Christmas, I have had too many other things happening and I plan to finally get away this weekend for a nice long ride but will be taking the Beemer this time.

I'm in the mood again to fiddle with the forks so some shed time coming up, great way of relaxing, well most times.

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