Pontoon Boat & Deck Boat Forum

I have a Bennington 2275 FSI just installed new Suzuki 140 hp 4 stroke on it. The dealer did not have a good choice of different props to try. He put a Black Max 13.25 x 17 on for me to try. The RPM's are good at 6100 but the speed in about the same as the 115 hp 4 stroke with a 13 pitch prop before 27 mph maybe 28 mph now with 25 more hp. Any Ideas?

The 4 stroke must have been fairly new? If so then I wouldn't be surprised by those #'s, Probably not enough of a HP increase to overcome pushing a pontoon through the water.

The old one was 15 years old

Amita 4 blade 15 pitch should work well and they are cheap! I have both a 15 and 17 pitch Amita 4 for my DF140 on my tritoon, use the 17 for light to moderate loads and the 15 for water sports or heavy loads.

RPMs are often a good guide for maxi.um performance. The zuki's are different animals with their planetary gear making them require high pitch propellers. Relatively few Suzuki mechanics are out there t setup them.
Between me and you, the Suzuki 140 horsepower motor has a reputation for good fuel efficiency and troublefree durability. But they are relatively "weak" for their horsepower. On the other hand, Suzuki's 150 horsepower is a whole lot more motor in cubic inches and performance than the 10 horsepower difference--a "strong" 150 hp.
I don't know if your old motor was a 2 stroke, but sometimes more 4 stroke horses are required to match older 2 stroke performance. You may be getting all you can get out of your new motor.

The old motor was a 4 stroke, the thing I am not sure about the dealers setup . I know the Suzuki gear rato is higher so it will run more pitch. When I told him about that he said he didn't know that, He has no Suzuki props and put Black Max props on them I know these are good props but all the diameters are smaller. What I have read was most Suzuki props are larger diameter. I want to buy a SS prop after I figure out what I need ,going to try and talk with another dealer tomorrow and see what he says.

I glossed right over the Suzuki part. If That mechanic doesn't know they take larger props he doesn't know Suzuki's. Scary.

I do have lifting stakes on my toons , and can trim the motor out right above three/forth way on the gauge with no slippage . The motor is mounted all the way down I been thinking should it not be raised up one hole . Looking a the Suzuki sheet on the props they list for the 140 hp 13-half x 15 then go to 14 x 17 in Aluminum . SS start 14 x 16 .