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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?
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How much weight are you pushing? The prop spins easier in reverse much like removing a screw . Do you still have points?
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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.
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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.
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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.
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Here is an updated video I took today that shows the problem I've been having. https://youtu.be/uBkZyNnV2iE
Any thoughts?
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