How much nitrogen on rear shock ?

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How much nitrogen on rear shock ?

Post  XAmériX on Sun Jan 04, 2015 3:50 pm

Hello everybody

I hesitate to prepare my suspension by a professionnal.
But for the moment maybe I would just rehabilitate my rear shock absorber
I make supermoto on track only.
I have already remade my fork last year

For the shock I can't find how much need for nitrogen inside?

If someone have already make a rehabilitation and have advice it's could be great Smile

Great ride and happy new year for all
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XAmériX
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Re: How much nitrogen on rear shock ?

Post  Mauser on Sun Jan 04, 2015 4:19 pm

From internet so no guarantee...
"The 650R rear shock can accept pressures up to 250psi in the desert - I run 200 with the 10.5kg spring bc the spring is too strong for me but the 200 helps reduce the rebound. Otherwise I would use 230 if I weighed 30lbs more. Obviously low oil viscosity contributes to the leak. "
Happ New Year

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Re: How much nitrogen on rear shock ?

Post  XAmériX on Sun Jan 04, 2015 4:51 pm

Thanks for your quickly answer and your search
I had found nothing on Google... I had make a bad search, sorry

On your bike Mauser you have the OEM parts ?

I forget to tell my weight, I am 80 kg for 1 meter 80
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Re: How much nitrogen on rear shock ?

Post  Pathfinder on Sun Jan 04, 2015 5:04 pm

Someone on this very forum mentions a book value of 142P.S.I.
IIRC, I put 150 P.SI. in mine when I rebuilt it


http://www.xr650rforum.com/t2224-ghey-thunder-build
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Re: How much nitrogen on rear shock ?

Post  XAmériX on Sun Jan 04, 2015 7:00 pm

Thank your for the link
You have put the nitrogen you or a professionnal ?

I had found this on Google
http://www.thumpertalk.com/topic/158516-nitrogen-charging/
Maybe 200 for SM and track ?
300 is to much :O
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Re: How much nitrogen on rear shock ?

Post  XAmériX on Wed Jan 07, 2015 2:53 pm

I've found the information on the shop manual.
The rear shock need :

981 kPa (1O kgf/cm2) of nitrogen
So 142 PSI

For the oil they said 'fork oil' ...
Fork capacity : 637 cm3
Fork level : 120 mm

I've found an other technical file.
They said SAE 5W.
I've put 10W, but for a harder suspension maybe 20W no ?
Kayaba is apparently very good. A guy who work for Ohlins had said this on a forum like a lot of members.
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