To answer OP's question in a bit more detail, the newer Star Sirius comes with a Curtis 1236 controller. It's set on Speed Control Express mode with a top speed of 24 mph. If it's switched to Speed Control and Max Speed parameter is increased to 5900 RPM it will go 28 mph. One way to do it is with a 1313-4401 programmer that plugs into the white 4 pin molex connector located beneath the seat near the controller. Programmer costs around $400 on eBay and sometimes on Amazon.
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