New boat problems

I posted over in the engine repair section and figured I may get more exposure here. I picked up a new boat yesterday which is a 98 ski nautique open now with the 5.8 pro boss 351 carbed. I brought it back and went to put it in and it had a lil trouble cranking took a few minutes to get going. Got it going parked it idling while I parked the truck. Took out across the lake and it ran great for about 15 min then at wot it would start cutting off but once I slacked up on the throttle it would pick back up and continue on until I tried to hit wot again and would do the same thing well I brought it back down to idle speed and idled for a few min and when I went to take back off it died and would crabk and run for a couple sec now it won't do anything I can see gas going in the top of carb and I am getting a real faint spark when I checked the plugs for Fire. I'm not a boat mechanic and am looking for any advice and info you guys have to offer.

cutting off only at WOT sounds like a fuel issue to me. I would first change filter, and check that the vent is not blocked.
your fuel pump may be too weak to keep the bowls fed when the secondaries are dumping.
thats where i would start.
and a good look unde rthe dist cap and at the plugs will also clue you in on whats going on.
not a bad idea to change that stuff and do an all around tune up if it hasnt been done in a while

Brock,
Get it out on the lake. The driveway run and only getting it to 130 may not be a good test since the heat may be causing the issue. Since it's a Protech conversion, I wonder what coil was used. If the correct one wasn't used, it may not like the heat or may be getting to hot due to improper wiring (ballast resistor related). Get us some more information.

Just got the boat home and tried to crank it again and It wouldn't do anything I pulled the dist cap off and it is what looked like a coat of corrosion cleaned it off and it fired up instantly. Could that have been a problem or just luck.

I pulled the dist cap off and noticed some corrosion on what would be the contacts I guess. And on the contact surface there was a powdery like substance built up

Ok i will have to take it to a dealer to do all that I don't think I'm that mechanically inclined.

Doubt there is points as Pete mentioned and also would question it being a Pro-Boss motor protech conversion. Get some pics of the motor, likely electronic ignition so new plugs, cap & rotor "should" be all that is needed for a tune-up, include wires if they look bad or ends are worn

No clue guess to much reading and research I guess. I just ordered a new cap and roder, fuel filter, coil hope this will help my problem. Another question I pulled off my coil and measured the primary and secondary resistance the secondary is within the rated specs however the primary I am getting a 0.0 reading on the meter would this have anything to do with some of the problem

I'm assuming the ignition system has not been changed I thought the 98 model had the protec system whuch I was wrong so it looks to be the original equipment on there.

Jump the coil with 12v from accessory side of solenoid.

Alt vs batt voltage, your numbers look ok for a points/resistor set up.

I got the volt meter back out and traced my wires all the way to the coil and I have 12 volts when I plug the purple wire from the distributor back to coil the volts drop back down to 10 what could cause this. Something with the dist causing the volts to drop at the coil.

Brock42 wrote: I got the volt meter back out and traced my wires all the way to the coil and I have 12 volts when I plug the purple wire from the distributor back to coil the volts drop back down to 10 what could cause this. Something with the dist causing the volts to drop at the coil.

Since you aren't that clear on where you are testing the voltage, nor stating what drop you are reading, I'm going to guess somewhat. The drop is from the resistance of the primary winding in the coil. What are you looking for???

I'm checking my voltage to the coil and am getting 12 volts but when I hook the purple wore back up from from the dist the voltage drops back to 10.