Need help with driving bass boat.  When I get up on plane it wants to porpoise.  I trim motor down and it gets better but still does it.  Seems the motor is past level and still boat wants to porpoise.  What should I do?  Any tips for running smooth?

Three main things that cause one to porpose, too much lift (trimed out too far or too much offset), too much weight in the rear, or bad rocker in the hull.   I would guess you are still running too much trim and need to bring it in some more.   Until you get a feel of how much trim you need start off with the motor trimed all the way in, get on plane and start trimming out.  The boat is going to gain speed as you and the spray out the side the start moving furrther back.  When it starts to bounce, trim back little bits until it stops.  At moderate to slow speeds or when coming off full plane is when they are going to want to porpose the most so you have the trime in more

What kind of boat, motor, prop setup do you have?

Have you done anything to the boat as far as engine height or changing props?

What kind of RPM's are you turning on the top end just before it starts porpoising?

My previous Champion was very weight sensitive and would porpoise in a minute if I didn't have the weight just right and the trim angle perfect.

It's a Skeeter zx190 with a 150 yamaha, comes std with a jackplate.  I have not adjusted anything beyond the dealer.

I'm not 100% certain but that particular hull is rated for either a 175 or 200 so you're down on HP right off the bat. What pitch prop are you running on it? Can you tell what type? (Yammy, laser, turbo, etc)

What kind of rpms are you turning as you're trimming. Are you able to reach at least 5500 or does it start porpoising before then. BTW, people put way too much stock in trim gauges. A high performance bassboat should be driven by watching the tachometer and the feel of the boat as it's moving through the water not the trim gauge.

Had the same problem with my zx150, Ben is the man, that is how I solved my problem.  Pop the hull out full down and keep trimming up until you hit the sweet spot.

Ben and Hooterz are right on target. After you have trimmed out to the sweet spot if for some reason you need to back off on the throttle and you begin to pospoise your two choices are to trim under a bit or increase throttle.

Sweet Spot is hard to define but it is where the boat gets up on pad. There is a sound that you come to recognize and steering torque doesn't exist, i.e. release the wheel and you continue straight down the lake.

Ben and Hooterz are right on target. After you have trimmed out to the sweet spot if for some reason you need to back off on the throttle and you begin to pospoise your two choices are to trim under a bit or increase throttle.

Sweet Spot is hard to define but it is where the boat gets up on pad. There is a sound that you come to recognize and steering torque doesn't exist, i.e. release the wheel and you continue straight down the lake.

Not sure they're on target or not.  He's not giving us much info to work with but if he's running at WOT and he's porpoising all the time to varying degrees depending on trim angle he's got some problems with the setup on that boat.  I've owned a few boats in my day but none had porpoising problems unless I was running around midrange speed./

Until he decides it's more than just learning to control the trim, I personnaly would not get all worked up about any of the other issues that can make one porpose,   Being new to a bass boat, my guess is he just needs to learn where he needs to use different amounts of trim.  

Now, if he trims all the way in and she still bounces, then I would start looking at other cause.

Thanks for the info.  I have some ideas to try next time in water.  Was no where near wot, in slow to mid range.  I talked to dealer and will try putting motor trim all the way down (which I had not done- had it down but not tucked up underneath).  

Used to driving with a 40 hp, so the 150 on the new skeeter is much touchier.

Always start with the motor tucked all the way under - much faster hole shot.

Take the boat back to the dealer and tell him to put a hydraulic jackplate on that sucker.......that will stop the porpoise action one way or the other,plus give you a little more speed as you lift the motor straight up out of the water in addition to the regular trimming.You get it set right and you wont have enough fiberglass in the water to worry about porpoising.

It is awesome feeling the difference between a V hull and a Bass boat. Each one has its +'s and -'s. I went with some of my Dad's friends up in the Chippewa Flowage last year. We had 12 guys, 5 V hulls plus my Skeeter, most HP on the V's was 50. Had this guy out the first day...he used to be a race car driver back in the 50's. Since I am a firm believer that any boat that floats is a good one, and I did not know the waterway at all, I fell in behind all of the other guys, struggling to keep it on plane. On the way back, the guy in front of me motioned for me to let her rip in a wide, deep straight part of the flowage. I looked at my partner who already had his thumb up, so I let her go.....he told his buddies when they caught up that he thought his watch ran backwards!!! I loved seeing the look on his face, even though in the world of bass boats, mine is not very fast. Man, I *** those guys, they are all retired and know how to catch those crappies!!