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Author Topic: Another shock question  (Read 981 times)
Spurlock
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« on: December 30, 2017, 12:19:01 PM »

I've read through many of the posts here on replacement shocks and am leaning toward the '73-'75 CBR900R shock w/CB-1 spring. But I see that it is a few mm longer and I would rather not raise the back of the bike. So I'm wondering if there is any option for shortening the eye to eye length of the 900 shock a bit. Possibly making an eccentric bushing for the upper eye out of Delrin or similar material. Or is that a solution looking for a problem? I like the seat height just the way it is, but I suppose leaving the spring preload a bit soft would help maintain the same ride height.

Thanks for any suggestions, and happy new year!

-Bill
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1975 Honda CB125S2, 1989 Honda NX250, 1989 Honda GB500, 1989 Honda CB-1
a_morti
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« Reply #1 on: December 30, 2017, 01:00:09 PM »

The best budget option seems to be CBR shock and cb-1 spring, with the CBR sidestand to balance the standing angle back out. The cbr1100x shock is also a pretty good performer for the money and can be slotted straight in, a new stand will still be required. The CBR shock is fully threaded so if you got a weight specific aftermarket spring, you could easily change it at home.

With the CBR shock you'll be needing to have someone swap the springs unless you can do it yourself. They would be able to just the length. But the bike really doesn't suffer for a bit of extra length on the shock.
« Last Edit: December 30, 2017, 01:01:49 PM by a_morti » Logged

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Spurlock
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« Reply #2 on: December 30, 2017, 01:35:06 PM »

The best budget option seems to be CBR shock and cb-1 spring, with the CBR sidestand to balance the standing angle back out. The cbr1100x shock is also a pretty good performer for the money and can be slotted straight in, a new stand will still be required. The CBR shock is fully threaded so if you got a weight specific aftermarket spring, you could easily change it at home.

With the CBR shock you'll be needing to have someone swap the springs unless you can do it yourself. They would be able to just the length. But the bike really doesn't suffer for a bit of extra length on the shock.

Thanks morti,
The original shock has lost all damping through much of the stroke, then it begins to damp suddenly about 1/2" from full extension. I might just look for a working OEM shock for now so I can take more time to research options.

-Bill
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a_morti
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« Reply #3 on: December 30, 2017, 01:41:29 PM »

There's a great thread on here covering a couple of known good options. It doesn't cover the blackbird shock but spacetiger said if someone sent him one, he'd test it.

For me the BB shock (I have one) is a good option as you can pick them up real cheap and they just work, no swapping springs or special tools required. The CBR stand is a must though.
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Spurlock
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« Reply #4 on: December 30, 2017, 01:51:01 PM »

There's a great thread on here covering a couple of known good options. It doesn't cover the blackbird shock but spacetiger said if someone sent him one, he'd test it.

For me the BB shock (I have one) is a good option as you can pick them up real cheap and they just work, no swapping springs or special tools required. The CBR stand is a must though.

Good info, thanks. Is there a particular model CBR side stand to look for? And same question, any particular year BB shock?

-Bill
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Spurlock
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« Reply #5 on: December 30, 2017, 01:53:26 PM »

Also, I see from this chart that the 2004-2006 CBR1000RR shock is about the same length as the CB-1. Is that not an option?

-Bill
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« Reply #6 on: December 30, 2017, 03:25:20 PM »

Not sure about cbr1k shocks. The problem is spring rate as well as length. Probably better stick with known options at this point.

CBR stand is 92-99. You need the spring with it but nothing else.
Blackbird shock is any year, buy by compromise between condition and price rather than year.

Grab the blackbird shock and stand. Probably cost 50$ and gets you to a point you can decide if it's worth spending more.
« Last Edit: December 30, 2017, 03:27:04 PM by a_morti » Logged

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Spurlock
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« Reply #7 on: January 02, 2018, 09:51:21 AM »

....CBR stand is 92-99. You need the spring with it but nothing else.
Blackbird shock is any year....

Morti, just one more question - am I after a stand from a specific model of '92-'99 CBR (600, 900. 929, 1000, etc)?

Thanks,

-Bill
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« Reply #8 on: January 02, 2018, 04:28:26 PM »

As far as I know the stand from any 92-99 CBR900rr all can be used. There is a difference in the spring length/mounting point from one year to another (not sure when it changed), but i believe the length of the stand is the same. So be sure to get spring and stand together as the Cb spring won't work, only the corresponding spring to the stand. However your Cb bolt and switch will work fine.
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Spurlock
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« Reply #9 on: January 02, 2018, 06:07:01 PM »

As far as I know the stand from any 92-99 CBR900rr all can be used. There is a difference in the spring length/mounting point from one year to another (not sure when it changed), but i believe the length of the stand is the same. So be sure to get spring and stand together as the Cb spring won't work, only the corresponding spring to the stand. However your Cb bolt and switch will work fine.

OK thanks, I will post back with what I find out.

-Bill
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Dash
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« Reply #10 on: January 06, 2018, 06:23:22 AM »

As far as I know the stand from any 92-99 CBR900rr all can be used. There is a difference in the spring length/mounting point from one year to another (not sure when it changed), but i believe the length of the stand is the same. So be sure to get spring and stand together as the Cb spring won't work, only the corresponding spring to the stand. However your Cb bolt and switch will work fine.

OK thanks, I will post back with what I find out.

-Bill

You could also extend your original sidestand.

I fused 2 CB-1 stands into 1 long one. Works like a charm and no issues with mounting points etc.
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« Reply #11 on: January 06, 2018, 06:39:21 AM »

Fine if you can weld, but the Cbr stand fitment is spot on, and they can be bought very cheap. Because it's a hollow tube, you could also cut, slug, and weld (or maybe thread internally and make it extendable, idk the size) even easier Smiley
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Spurlock
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« Reply #12 on: January 06, 2018, 08:55:02 PM »

Since I shortened the Blackbird shock to just slightly longer than stock and I have a slightly oversized rear tire, I decided the side stand could best be 3/4" longer. A CBR600 stand from ebay was about 1" longer which was OK but the rod for pushing with the heel was in the wrong place plus the spring hook on the stand was also in the wrong place for correct spring tension (the CB-1 and CBR600 springs were the same length). So rather than cut and weld on the CBR600 stand I decided to add a foot to the stock stand. It is 1" thick Delrin, with the stand recessed 1/4" into it for a net increase in stand length of 3/4". Plus it gives a bigger footprint for standing securely on soft ground. Tested in damp road shoulders today and it works great!



-Bill
« Last Edit: January 07, 2018, 02:29:21 PM by Spurlock » Logged

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« Reply #13 on: January 07, 2018, 02:23:51 PM »

Nice!  I've thought about doing something similar with rubber.  I would've thought delrin was a little on the slippery side.
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