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here is an article on cb550 suspension tuning:

http://sohc4.us/?q=node/143

they say 200ccs of fork oil but those are for forks with their suspension mods. I am away from my service manual but 145ccs sounds close. If it can wait till tomorrow I will be by my manual then.
 

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manual says for a 78 550K it should be 145-150ccs (4.8 to 4.9 ounces)for 5wt tranny fuild. The manual specifies tranny fluid because of its anti foaming properties.

Some of the SOHC4.com guys 10wt fork oil in the same amount to stiffen up their suspensions.

does that help?
 
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