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primary chain, help needed

Henrik

CB750 New member
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Hi all, I am in the process off renovating a cb750 custom
after a broken cam to crank chain, I have taken the engine apart, and wanted to change all 3 chains, the new chains are here now BUT!!!!!
the primary chain is not as wide as the new one, contain the chain links my chain have 6-7-6-7 and so on links, the new replacement chain have 8-9-8-9 and so on links, I have looked alll over and only find the 8-9 link chain to the cb750 custom, I did see that the cb550 and 650 have the same chain as mine 6-7 links
do any off you know why? did some one change my crank to a 650 or????
 
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