With like new TW's with really low mileage in the $2500-$3500 range or less, I'd start looking. Sell the ole girl off or keep it for parts. Rebuild is always a question on reliability vs money spent, in my experience.
Even better look for a motor donor bike. Maybe a wrecked low mileage 300-500cc road bike. Would love to have a Honda CB500 or 300 engine in a TW frame.