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Offline Rexelstar

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Re: cbr600f4 rear shock spring thoughts
« Reply #20 on: March 06, 2019, 11:44:16 AM »
*Originally Posted by Rexelstar [+]
Specs oem CBR600f4 spring info.

Free total length =  155mm /156mm (oem length new?)
Position 1 loaded =  139.2mm
16.8mm oem preload

The Eibach spring will be 152.4mm free length, a difference of 3.6mm shorter.

152.4mm minus 10mm(?) = 142.4mm preload (fixed)

Left total difference 3.2mm which will be compensated by newly machined seat's...I think.
 :087:


Bottom inner diameter spring =  59.5mm
Bottom outer diameter spring =  85mm

Bottom inner seat diameter =  58mm
Bottom outer seat diameter =  75mm

-------------
Top inner diameter spring =  52 mm
Top outer diameter spring =  77 mm

Top inner seat diameter =  50.5 mm
Top outer seat diameter =  70 mm

« Last Edit: March 06, 2019, 12:09:10 PM by Rexelstar »
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Offline Rexelstar

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Re: cbr600f4 rear shock spring thoughts
« Reply #21 on: March 06, 2019, 01:51:08 PM »
Some pics of parts and tools.

To remove top seat the eye bracket needs to be removed. Not yet, first wait for the Eibach spring and thoughts;)



« Last Edit: March 06, 2019, 01:54:18 PM by Rexelstar »
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Offline EscCtrl

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Re: cbr600f4 rear shock spring thoughts
« Reply #22 on: March 06, 2019, 08:00:14 PM »
Good info. Thanks for posting this for the record.

Offline Rexelstar

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Re: cbr600f4 rear shock spring thoughts
« Reply #23 on: March 07, 2019, 07:01:39 PM »
Does somebody knows the unloaded length and (fixed) position 1 loaded length of the standard cb500x spring?

Thanks.
« Last Edit: March 07, 2019, 07:03:27 PM by Rexelstar »
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Offline gregjet

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Re: cbr600f4 rear shock spring thoughts
« Reply #24 on: March 07, 2019, 07:17:04 PM »
I have the 2013 model. If I remember I will take the spring off today and measure it.

Offline Rexelstar

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Re: cbr600f4 rear shock spring thoughts
« Reply #25 on: March 07, 2019, 07:28:05 PM »
*Originally Posted by gregjet [+]
I have the 2013 model. If I remember I will take the spring off today and measure it.

Is much appreciated !
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Offline gregjet

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Re: cbr600f4 rear shock spring thoughts
« Reply #26 on: March 07, 2019, 08:24:52 PM »
OK some caveats. The spring is on a bike that has done 34000km. There is a more than reasonable chance that it is sacked to some extent. That would be typical of Japanese springs. The upper spring retainer is an aluminium one I turned myself and is almost certainly a different seat height. Measure your seated length as it will be more accurate.
Free length of my spring from a 2013 CB500X with 34000km is 203mm. Wire diameter is 11.50mm ( with paint). My loaded length is 189mm (min preload), but that is with a custom made  aluminium upper spring retainer and a modified and machined lower retainer/adjuster.
BTW the spring is a quite tapered design, so none of the usual spring rate calculators will work accurately. You may have to measure every "coil" width and make a rolling average to get closer to the real value. Or see if you can find Honda's factory value if you want to use that as a base.
« Last Edit: March 07, 2019, 08:25:51 PM by gregjet »

Offline Rexelstar

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Re: cbr600f4 rear shock spring thoughts
« Reply #27 on: March 08, 2019, 04:59:46 PM »
may have to measure every "coil" width and make a rolling average to get closer to the real value. Or see if you can find Honda's factory value if you want to use that as a base.


Without the necessary calculation programs and the problem by getting 'inside' information from manufactures, suspension dealers etc. this is will take a lot of effort...for all reasons.


Just thinking out loud;
Find the fixed preload info of the racetech rebuild cbr600f4 spring and seat set ?
This could give the correct and missing information..
Now finding someone who owns the racetech cbr600 shock adjusted for use on the cb500x.

I thought I have read some info from Oyabun that the racetech spring comes from eibach? Don't know for sure..
« Last Edit: March 08, 2019, 05:26:00 PM by Rexelstar »
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Offline gregjet

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Re: cbr600f4 rear shock spring thoughts
« Reply #28 on: March 08, 2019, 07:26:52 PM »
I am pretty sure that at least some of the online spring/shock calculators will give value of spring they recommend for you and your bike. That value will be the same for any other shock, SO LONG AS they all use the same travel in the shock for your bike, irrespective of the physical dimensions of the spring. Usually a slightly longer stroke will use a softer spring rate.
If you buy a spring, so long as the rate is the same, and the spring will fit safely on the shock, you just have to adjust the retainer/adjuster to fit .
If you can't do it your self, if you have the dimensions a local machine shop will turn some spacers or new retainer/spacers relatively cheaply. Can be worth it to get a quality spring to fit.

Offline Rexelstar

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Re: cbr600f4 rear shock spring thoughts
« Reply #29 on: March 08, 2019, 08:12:15 PM »
Much appreciate your advice!

The eibach spring is on it's way and will be monday for delivery. I will take the specs first.
Just made the appointment with my mate Jay who has the business and machinery to turn some spacers or new retainer/spacers.
 
I would prefer to have some extra info about the fixed preload of the bike or common type's.
I now have the 16.8mm cbr600f4 and your cb500x +/- 14.0mm  fixed (min) preload. The more info to be found gives me less nerves;)

Found some online calculators to do my research now.

Thanks for the replies!
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