SLT 750 Problem

[jvhenry]

I have a SLT750 that I recently put a rebuilt engine in, triple fuel pump, new spark plugs, new hoses from the on-off-res valve to the carbs. The problem that I am having is I put it in the water for the first time and it ran great for about 20 minutes and then it really started bogging down on low end. If you gas it from a stop it will climb throught he low end slowly and then take off and it seems like it runs fine from there on until you stop or slow way down and then the same thing again. I know I should of replaced the fuel lines all the way to the tank and I plan on doing it now. My question is does it sound like a low end carb adjustment, I didnt think so since it ran fine for a while. What else could it be? Sorry if this is not descriptive enough but I am learning on the go. If I need to elaborate or answer any other questions to try and find the problem please do not hesitate to ask.

[jvhenry]

I also converted to premix.

[ph2ocraft]

What's you current compression??

[jvhenry]

I havent checked it and the ski is at the lake so I wont be able to check it until next weekend.

[xlint89]

Check the plugs. Maybe they're oil fouling?