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  1. #1
    Join Date
    May 2019
    Posts
    7

    Default 1990 Sunsport revs to 2000 rpm then won't go any faster. Reverse works fine

    If it's weighed down, we won't be able to plane out and get to a cruising speed. If it's just me and a few two others, it'll slowly accelerate, but eventually get to an okay wakeboarding speed.

    The engine revs easily to 5-6k rpms in reverse, but under load in forward, it struggles once it gets to 2000 rpms.

    I initially thought it was a fuel delivery problem, but since it works fine in reverse, I'm wondering if it's a problem with the butterfly valves on the carb, or the throttle cable itself.

    Has anyone seen anything like this on their boats?

  2. #2
    Join Date
    Jul 2007
    Location
    Flowery Branch Georgia
    Posts
    2,339

    Default

    How much weight are you pushing? The prop spins easier in reverse much like removing a screw . Do you still have points?

  3. #3
    Join Date
    May 2019
    Posts
    7

    Default

    Yes, still has point style ignition system. I'll look them over today.

    The weight I'm pushing when won't get above 22-2400 RPMs is just the boat loaded with wakeboard supplies and 4 adults.

  4. #4
    Join Date
    Jul 2007
    Location
    Flowery Branch Georgia
    Posts
    2,339

    Default

    Start with checking the dwell on the points. The points need to be replaced yearly . If you don't have a dwell meter you can set them with a clean feeler gauge. Set the points then the timing. If that doesn't help the carb will probably need a rebuild. I gave up on points I have 3 boats with 351 ford engines running on a GM HEI style distributors I am very happy with the results.

  5. #5
    Join Date
    May 2019
    Posts
    7

    Default

    Everything seems to be working fine in the driveway when the engine is not under load. I noticed that I was low on transmission fluid, so I purchased a quart and filled it up. I'm taking it to the lake next week to test it on the water. I should also check the points and maybe give it a tune up before I go.

  6. #6
    Join Date
    May 2019
    Posts
    7

    Default

    Here is an updated video I took today that shows the problem I've been having. https://youtu.be/uBkZyNnV2iE

    Any thoughts?

  7. #7
    Join Date
    Jul 2007
    Location
    Flowery Branch Georgia
    Posts
    2,339

    Default

    Trans looks way over full should be to the line about 1 inch from the bottom of the stick. Did you check the points and timing? When did this problem start ? Was it running good last year? Where are you located?

  8. #8
    Join Date
    May 2019
    Posts
    7

    Default

    Quote Originally Posted by michael hunter View Post
    Trans looks way over full should be to the line about 1 inch from the bottom of the stick. Did you check the points and timing? When did this problem start ? Was it running good last year? Where are you located?
    Thanks for the insight on the fluid level. I'll pump it out and get the proper amount of fluid in there.

    The problem started when we took it out for the first time this season. I believe it has been converted to an electronic ignition setup, so it does not have points. I'll take my timing light with me to the marina today to see what the timing looks like.

  9. #9
    Join Date
    Jul 2007
    Location
    Flowery Branch Georgia
    Posts
    2,339

    Default

    Find out what brand the ignition was converted to. What state are you in?

  10. #10
    Join Date
    May 2019
    Posts
    7

    Default

    Quote Originally Posted by michael hunter View Post
    Find out what brand the ignition was converted to. What state are you in?
    I'm in Utah. I couldn't find the ignition information. I'm very unfamiliar with ignition systems. I couldn't 100% confirm I don't have points. I took the distributor cap off and didn't see any capacitors, there is a plate with a black electronic module on it. When I remove the plate, below is what appears to be weights and springs surrounding the distributor (That's where the points would be I think) I don't see any points, just some springs and weights.

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