snlphillips
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- May 2, 2017
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First time poster, long time reader. Thank you everybody that has contributed to this great website.
I recently bought a 1998 Parker 2320 notched transom w/ '06 Yamaha F250. I went through this boat with a fine toothed comb and found a several little things that need attention but the price was right and I don't mind working on boats.
The prop slip problem. On the sea trial the boat ran 32mph (gps) at 5800rpm on flat water with minimal current. I figured 40-45mph at WOT with this set up. Prop is a stainless 17 pitch 3 blade. Owner gave me the original 19 pitch 3 blade black aluminum prop with the boat. I put the 19 pitch prop on and had similar results. It even sounds like the motor was "spinning out". Lower unit looks good, prop hub is tight. Motor is mounted one hole up from the lowest position. I read a lot about prop selection and it sounds like my set up would do well with a Rev4 17p or 19p prop. However, I doubt just the prop is going to completely solve 30-35% prop slip. The next step of troubleshooting is a lot more intrusive and I'd like some opinions. I have a Raymarine C120 with plastic thru hull transducer mounted in the flat portion of the hull right in line with my outboard, see photos. I'm thinking this is a big part of my problem. I may try to scrape the bottom paint off it and generally try to smooth things out and take it for a test run. But I'm thinking for optimum performance, buy a new 20* transducer and mount it to the side.
What do you guys think? Am I missing anything else? Is there anything else on the motor that I should check? Compression test and LU corrosion all looked really good.
https://goo.gl/photos/pZ7JrNvCQijUBwKCA
https://goo.gl/photos/htQnVLNWXGiZBNir8
I recently bought a 1998 Parker 2320 notched transom w/ '06 Yamaha F250. I went through this boat with a fine toothed comb and found a several little things that need attention but the price was right and I don't mind working on boats.
The prop slip problem. On the sea trial the boat ran 32mph (gps) at 5800rpm on flat water with minimal current. I figured 40-45mph at WOT with this set up. Prop is a stainless 17 pitch 3 blade. Owner gave me the original 19 pitch 3 blade black aluminum prop with the boat. I put the 19 pitch prop on and had similar results. It even sounds like the motor was "spinning out". Lower unit looks good, prop hub is tight. Motor is mounted one hole up from the lowest position. I read a lot about prop selection and it sounds like my set up would do well with a Rev4 17p or 19p prop. However, I doubt just the prop is going to completely solve 30-35% prop slip. The next step of troubleshooting is a lot more intrusive and I'd like some opinions. I have a Raymarine C120 with plastic thru hull transducer mounted in the flat portion of the hull right in line with my outboard, see photos. I'm thinking this is a big part of my problem. I may try to scrape the bottom paint off it and generally try to smooth things out and take it for a test run. But I'm thinking for optimum performance, buy a new 20* transducer and mount it to the side.
What do you guys think? Am I missing anything else? Is there anything else on the motor that I should check? Compression test and LU corrosion all looked really good.
https://goo.gl/photos/pZ7JrNvCQijUBwKCA
https://goo.gl/photos/htQnVLNWXGiZBNir8