Jetting for a 70cc Airsal

This is my first attempt at kitting a moped so I'm curious if anyone with a similar setup can help me figure out what the jetting should be. Here's the best stuff out of the pile of components I have:

motor: rebuilt e50, 18t front sprocket

kit: Airsal 70cc (45mm bore), still looking for a piston ring

carb: Dellorto 19mm

pipe: Biturbo, but I'm open to suggestions

My goal is to get my Newport to reach 40mph reliably without blowing itself up. Any advice is welcome.

Piston rings are especially welcome. I've been asking around and the best chance I've found yet is that MHR can maybe special order some for me.

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