Over propped or something else?

[sigep0435]

I have a '89 Baja 19' w/ 4.3 OMC. The weight is around 2450 #'s, that's with a full tank and just me on board. Every since I've bought the boat I can't get over 3500 rpm. The manual specifies reccommened range of 4200-4400 rpm. The prop is 15x17. Is there other simple things that I could check for that would be limiting the rpm's before buying a lower pitch prop. I'm only getting 31.8 mph(gps)out of it and thought that I should at least get to around 40mph. Thanks in advance for your opinions.

 

[tommays]

Re: Over propped or something else?

has the motor evevr been fully tuned up to the orginal specs with new everything<br /><br />cap ,rotor ,wires ,plugs , fuel filters ect<br /><br /><br />tommays

 

[sigep0435]

Re: Over propped or something else?

That's a good question. The person that I bought it from, had the reciept from having it "summerized" right before I bought it. But it didn't go into detail of what was done. A tune up will be the next thing on my list, even if it doesn't fix the problem, I suppose it'd be a good thing to have done.

 

[murphini]

Re: Over propped or something else?

are you trimmed out when you are driving? As a new boater I had the same issue where I couldn't get my RPMs up to the WOT specified range. Then someone showed me the whole "trimming out" idea. As I trimmed the boat up, the rpms also rose as more of the boat was out of the water. It was an "ah haaaa" moment.

 

[bigdaddyofhouse]

Re: Over propped or something else?

That is the best prop for ski'ing.your rpm's with it should be at least 4500-4700.