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Hello I have a 89 tracker tf1800 with a mariner 150 mag 2. I had a 25 pitch 4 blade not sure what the diameter is. I bought a 3 blade 23 14 1/4 aluminum because I needed to gain some rpms, Motor wouldn’t even go about 1500 rpms. The 25 4 blade has a smaller exhaust than the new one. Wondering...
