I found a ´73 Trident in rough condition. The gas in the tank smells like kerosene. The carbs are oozing the old gas. The bike turns over with the kicker and he said it ran a few years ago. What can I expect to pay a local mechanic to get it running (ballpark)? Is it worth getting a tuneup or should I buy to resell? He only wants $400. Thank you.