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'89 JS550 SBN Carb upgrade?

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I just got an '89 JS550 with the Mikuni BN44 carburetor. I'm thinking of upgrading to the SBN carb.
Will it fit right in? Will I need an adaptor plate? Does the spark arrestor bolt right to the SBN? Do I need to change the cable routing? What else will I need buy or consider?
I'll be grateful for any guidance...
 
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