Posted by Phil T on 04/23/14 - 5:13 AM
#2
I would suspect the engine is mounted too low, as a start. Almost every boat dealer/yard mounts engines 1 hole up. Typically engines on Boston Whalers perform close to ideal when mounted 2 or 3 holes up. E-TEC motors perform ideally when mounted all the way up.
Upper Bolt Holes
Top
0 <---- All the way down
0 <-----1 hole up
0 <-----2 holes up
0 <-----3 holes up
You will get the best overall performance ditching the aluminum prop NOW. The blade geometry is slightly different even with the same brand and size. Yamaha makes decent props so you don't need to change brands.