Check out RC Scooters. He does a big bore kit which seems pretty popular. The zuma is very similar to the Cygnus, or if you have the later model here in NZ it might even be exactly the same. Cylinder and head wise i'm sure they are the same. Crankshafts are different. RC Scooters are on Facebook and a link to the web site and the kit is here:
https://www.rcscooters.com/product-p...-jqTh9DNm6n49Q.
I have a bunch of his stuff in my Yamaha Cygnus at the moment. Very nice gear and good service. Chris Cey is his name.
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