Shock compression question

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06 Dec 2016 12:27 #749667 by davido
Shock compression question was created by davido
I need to calculate the maximum compression of my rear shocks ( chain clearance issues). I was thinking to measure the spaces between the springs and subtract that from the overall length. Does that sound about right or is there a better way?
Thanks

P.s. YSS shocks (E302T)

www.kzrider.com/forum/11-projects/594313-csr1000-project-build
CB550 (1978)
CB500/4 (1972)*
KZ1000CSR (1981)
XT 600E (1999)
TDM900 (2003)

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06 Dec 2016 14:29 #749674 by zed1015
Replied by zed1015 on topic Shock compression question

davido wrote: I need to calculate the maximum compression of my rear shocks ( chain clearance issues). I was thinking to measure the spaces between the springs and subtract that from the overall length. Does that sound about right or is there a better way?
Thanks

P.s. YSS shocks (E302T)


Subtracting the spaces will give the maximum compression to coil bind but the damper should bottom out on its rubber bump stop before that happens.
The best way is to have the bike on it's main stand or sat on a crate and fit the shocks ( or just one shock) with the springs removed .
That way you can easily move the arm though its full travel to see where the problem lies.

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06 Dec 2016 15:12 - 06 Dec 2016 15:13 #749676 by Nerdy
Replied by Nerdy on topic Shock compression question

zed1015 wrote: Subtracting the spaces will give the maximum compression to coil bind but the damper should bottom out on its rubber bump stop before that happens.
The best way is to have the bike on it's main stand or sat on a crate and fit the shocks ( or just one shock) with the springs removed .
That way you can easily move the arm though its full travel to see where the problem lies.


One could also (I suspect) measure the distance from the shock body to the rubber damper to arrive at the same measurement without the need to remove the springs. If all you're looking for is a rough order of magnitude (ROM) this should be fine, but what zed1015 would be more accurate.

If the rubber damper is very soft you might want to add a few mm to see what would happen if you bottom the shocks out hard.

1979 KZ400 Gifted to a couple of nephews
1967 Yamaha YCS1 Bonanza
1980 KZ440B
1981 Yamaha XT250H
1981 KZ440 LTD project bike
1981 GPz550
2013 Yamaha FZ6R
Last edit: 06 Dec 2016 15:13 by Nerdy.
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07 Dec 2016 00:02 #749715 by davido
Replied by davido on topic Shock compression question
Ok, thanks. Ill give that a go.

www.kzrider.com/forum/11-projects/594313-csr1000-project-build
CB550 (1978)
CB500/4 (1972)*
KZ1000CSR (1981)
XT 600E (1999)
TDM900 (2003)

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