Yamaha 130 v4 prop question

maineiac5586

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Feb 14, 2009
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Got my 2001 yamaha 130 v4 2 stroke on my 1997 wellcraft 190ccf center console out on the water today for the first time. Felt a little slow to plane in my opinion. I checked top speed with a GPS speedometer got up to 47 mph at 6000 rpm. My boat only had me on it and 50 gal of fuel in the tank. It cruises 32 mph around 4500 rpm. I know 6k is the upper limit so should I try to get closer to 5500 rpm? Current prop is 3 blade stainless
13 1/4 x 17 Thank you
 

99yam40

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have you looked at Yamaha performance bulletins to see if they had a motor and rig like yours to see what it showed?
I thought 6K was above the max on most 2 strokes
 

maineiac5586

Senior Chief Petty Officer
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Feb 14, 2009
Messages
675
have you looked at Yamaha performance bulletins to see if they had a motor and rig like yours to see what it showed?
I thought 6K was above the max on most 2 strokes
No. Where should I find those?
 

maineiac5586

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Feb 14, 2009
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Couldn't find my boat in bulletin. Thinking about a 4 blade as my boat needs stern lift due to porpoising issues. Motor is mounted at correct height. From what I researched this hull design is why this happens. My motors rpm range according to the manual is 5500 to 6000. Rated 130 hp is at 5500 rpm. I've read that going from a 3 blade to 4 blade while keeping pitch the same will automatically lower the rpm by 300 or so. Just need to decide if I go to a 19 inch pitch to get closer to that rated rpm of 5500. Any inputs are welcome
 

99yam40

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it does not make sense to me.
slow to plane out to means too much prop, but that depends on if the RPM comes up fine, but prop is not biting good enough to get the boat moving fast enough.
and then it over revs like there is not enough pitch or size to it

did you find a boat and motor close to your set up to compare speeds,RPM, and time ?
 

maineiac5586

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Feb 14, 2009
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Ok I put a 4 blade aluminum prop on 13.25 x 17 pitch (same as my prior prop but this one has 4 blades) took it out today hoke shot greatly improved planes faster less bow lift coming up on plane. Top rpm was 5400 rpm so I lost about 600 rpm. Previous prop was stainless so maybe that accounts for the big rpm difference? I was expecting about 300 rpm loss and even brought a 4 blade 13.25 x 19 pitch along but figured that would have pulled my rpm down even more. So now I have to decide between 13.25 x 17 4 blade stainless or go even less pitch like 16 or 15? Top speed with the 3 blade was 47 mph. 4 blade aluminum was 42 mph. Not super concerned with a few mph up top. This motor is rated at 130 hp at 5500 rpm. Operating range is 5 to 6k. For reference the boat had a full tank of gas (50 gal). And just me on board. IN the future might have 3 or 4 people aboard. Any advice or comments regarding prop selection based on above data is welcomed.
 
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