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1987 Revenge 25 Twin Yamaha 150's. I have only owned the boat a short time, still trying to work out the bugs and I don't know the maintainance history. My fear is there wasn't much.

One thing that perplexes me is when I bring the throttles up slowly in neutrel sometimes the engines will rev up on their own, even when I stop moving the throttle. They do slow right down when I pull the throttle back. Anyone have any idea whats causing this?

Thanks,
Dennis