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  1. #1

    Question Mercury 4 Stroke 60HP Bigfoot runs good at full throttle but not at max RPM and speed

    Hi, I'm a new boat owner and I've got a 60HP Bigfoot 4 Stroke EFI. It had been sitting covered up for the last 3 years and not ran any. I got it from a friend and the last time it was out 3 years ago it ran perfect. Back then it had just got brand new injectors and plugs. I actually got it running easily this past summer. But when we had it on the water when it was at full throttle it wouldn't get to max speed or RPM. It did reach max speed and RPM a few times and would run but once you throttled down and then throttled back up it wasn't max, Then at times it would all of a sudden catch up and go. I checked plugs even though they were new 3 years ago and they looked fine. I'm thinking it might be something to do with some old gas that might not have ran out. I have a brand new fuel filter I'm going to install once spring hits and we start getting it ready for the water. But if anyone could give me any information help that would be great. Thanks for all info in advance.

  2. #2
    Join Date
    Nov 2011
    Location
    tennessee
    Posts
    2,713

    Default Re: Mercury 4 Stroke 60HP Bigfoot runs good at full throttle but not at max RPM and speed

    Drain old fuel,drain and flush VST,clean pressure regulator and a bottle of Quickleen in fuel.
    Pappys Sales and Service
    Owner and Factory Certified Technician
    Former racer KDBA (Kentucky Drag Boat Association)

  3. #3

    Default Re: Mercury 4 Stroke 60HP Bigfoot runs good at full throttle but not at max RPM and speed

    Quote Originally Posted by faztbullet View Post
    Drain old fuel,drain and flush VST,clean pressure regulator and a bottle of Quickleen in fuel.
    Thanks I will try that and get back to you.

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