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Author Topic: CB750 NON-progressive fork springs  (Read 923 times)

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Offline bcsssj

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CB750 NON-progressive fork springs
« on: July 15, 2015, 12:17:53 PM »
I need some help!
I have cartridge emulators for the stock tubs, but I am having trouble finding springs that are not progressive springs.
My understanding is that you are not supposed to use progressive springs with these.
I'm having a hard time finding a supplier that either has the stock size or shows the specs of what they have for sale.

Can anyone point me in the right direction?
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Bryan
Irmo, SC

74 CB750
05 Ninja 250

Offline flybox1

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Re: CB750 NON-progressive fork springs
« Reply #1 on: July 15, 2015, 12:33:07 PM »
racetech.com
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

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1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
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Offline calj737

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Re: CB750 NON-progressive fork springs
« Reply #2 on: July 15, 2015, 03:59:00 PM »
Ditto. They're called "single rate" springs and should be calibrated for your weight (plus passenger if desired).
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'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline bcsssj

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Re: CB750 NON-progressive fork springs
« Reply #3 on: July 15, 2015, 06:07:14 PM »
Thanks guys.
I saw racetech, but wasn't sure if they were the only option.
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Bryan
Irmo, SC

74 CB750
05 Ninja 250

Offline bcsssj

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Re: CB750 NON-progressive fork springs
« Reply #4 on: July 16, 2015, 08:17:32 PM »
One more follow-up question.

Racetech is suggesting 23.5x410mm springs.
I see in the manual that minimum acceptable length is about 19", but I can't find the original stock length.
Is 23.5 the right length?
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Bryan
Irmo, SC

74 CB750
05 Ninja 250

Offline calj737

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Re: CB750 NON-progressive fork springs
« Reply #5 on: July 17, 2015, 03:37:22 AM »
It will be correct for a single rate spring based upon the weight you gave them, and the bike model.
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'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline becken

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Re: CB750 NON-progressive fork springs
« Reply #6 on: July 17, 2015, 05:04:59 AM »
With Racetech springs you will get material to cut your own preload spacers. Check their website for the proper way to set sag using the right length spacers for your weight. Pretty easy to do and makes a difference.
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1976 CB550F bought new
1981 CM400A wife bought new
2004 GL1800
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