72' 85 hp idles awesome, but dies when I relly open the throttle.

[SparkieBoat]

Re: 72' 85 hp idles awesome, but dies when I relly open the throttle.

you probably will not get any more speed by going with a bigger prop..probably just lower RPMs...you could try raising your motor a notch or two...and getting a planing fin..if your rpms get much over 6K I would go with one 2" bigger pitch. you can also experiment with shifting weight around in your boat..I moved my center console forward 3" and it really helped.

 

[SparkieBoat]

Re: 72' 85 hp idles awesome, but dies when I relly open the throttle.

also that 85 is the same weight as a 115, if you want more speed sale the 85 and get you a good used 115, I recommend one from at least 79' or newer.

 

[INDYCAVER1]

Re: 72' 85 hp idles awesome, but dies when I relly open the throttle.

My boat says its only rated for 110 hp, but whats 5 more horses? That woud not be out of the question if I found a good deal on one. I might try a fin and playing with the trim to get a little more speed and faster planing. When i got the boat the previous owner had the trim setting on the second notch out from the transom, and I have moved to to the third. I might try the 4th notch next time and see what it does. I planes out at just over 18 mph now, so maybe the next notch wont hurt that too bad.

 

[SparkieBoat]

Re: 72' 85 hp idles awesome, but dies when I relly open the throttle.

the higher you can get your motor without the prop cavitating the better (less drag). the fin will help stop cavitation. also you can get a manual jack plate for under $100 this will help some also. but a 115 should be the real answer.