The prop is where "the rubber meets the road" for a boat...if it's not right yer wastin' gas and losing performance...you should be in the neighborhood of 15" dia. x 17 pitch (15 x 17) although you'll want to experiment for best on your particular boat...do you have a working tachometer on your boat and know what the engine manufacturer's highest recommended RPM is?...
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'74 V-20/ BF 150
'95 V-21/ BF 150
'84 V-20/ 200 2.4 Merc
'87 V-20/'18 F150 Yamaha
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