mgs
Sailor
Posts: 9
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Post by mgs on Aug 28, 2019 10:12:53 GMT -6
I have a 02 180cc seapro. Every since I purchased the boat I have felt performance is not up to par. I have finaly settled on proper prop and now need to determine proper motor mount. What drives me nuts is determining where is the bottom of transom on this boat because at bottom of what I would call the transom it indents back toward front of boat 8 inches and down another 6 inches. It looks like a splash well on the bottom. I have a 90 hp yamaha with a 25 inch shaft and is currently mounted on the top hole on motor mount. If anyone here has that setup, please let me know how yours is setup. Thanks
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Post by Juan on Aug 28, 2019 13:23:07 GMT -6
I don't have that setup but the bottom of the hull is the lowest point and the cavitation plate on the motor should be level with or very close to that. When you've got the boat on plane the cavitation plate should be skimming the water's surface and for the best performance, you should be turning at or close to the maximum recommended rpms at wide open throttle.
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Post by gnrphil on Sept 17, 2019 7:50:34 GMT -6
What Juan said ^^^^, I think being mounted in the top hole is more than likely too low especially on a hull shaped like yours, that indentation is effectively acting like a bracket giving the motor some "set back". Generally for every 12" of setback the motor should be raised 1". Take a look at the Anti Ventilation plate and see where it is while running like Juan said, you can determine your needed motor height from there.
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