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Those are the numbers ive been awaiting for a 40hp on that hull, its not same as ny hull, but similar. Thats going to be great on gas. An a joy with all that space in there due to no center console.
I got some help from Precision propeller and found out that the spacer is a two piece spacer and has different applications. On my application only one piece of the spacer is required and I installed it with both. The part of the spacer that broke is for a different engine so I was able to use the rest of the spacer and install the prop correctly with the specified torque. This information was in the instructions however it was a little confusing because the spacer came packaged in one piece and there was also another washer in the kit that is for yet another application.
All seems good now and precision propeller was very helpful. I hope this resolves the engine tick.
I took the boat out this morning to test with the prop installed correctly and I'm glad to report that it ran great. The engine knock that I thought I was hearing before was in fact caused by the prop and is now gone. The engine ran smooth and quite.
This morning I had 2 adults (including me), a 3 year old, and a little fishing gear, the WOT rpm was 5050 and top speed was 30. With this engine mounted all the way up I am unable to trim out much as it will begin to cavitate in turns. With the engine trimmed all the way in it is very quick to plane and reaches 30 mph without any trim. Also trimmed all in there is absolutely no cavitation.
Does anybody think that there might be something gained by lowering the engine one hole and having more trim adjustment?
I found the same behavior on my 15 with the engine raised all the way up. I lowered the engine one hole and found the performance overall was best here for my setup (great top speed, great hole shot with controlled minimal bow rise and no aeration, great handling in turns with no aeration, and good trim adjustability). Everyone is different. Try lowering the engine one hole and see how it performs. Then you can decide which position is best for your setup.
Edited by wlagarde on 05/17/14 - 12:23 PM
1976 Sport 15 w/ 2005 50hp Nissan 2 stroke
