I'm over in Orlando, got lots of experience on bike repairs. I ride a Reflex 250, and can't see it pushing a 3 wheeler with lots of power. I'd first make sure your machine is up to spec. Then try different gearing to achieve the best acceleration, and top speed that you need.
A complete engine change on a V twin will be costly unless you find a used bike / wreck to get all the components from. Still looking at over a grand easily. I'd shoot for a 650 jap cruiser that fits the bill.
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