'99 GP800 with on-water only problem continued
I have posted about this ski before and have had two service shops work on it. There is a perplexing issue with it that must have a known solution. So far I have had new pistons installed and the carbs rebuilt. Reeds were clean. A missing flame arrestor involved with the air intake was replaced. Gas lines are fine. Power valves were replaced and Waveater clips installed. The problem is that the engine purrs on the trailer and runs immediately up to 8k rpms. But on the water, the engine bogs around 4500/5000 rpm and sounds like it is surging up and down when the throttle is opened up. Periodically, it will start to accelerate and then will launch into WOT status (with the throttle set at WOT). It was too choppy today to let it run up to max speed, so I don't know what would happen on flat water. For about an hour, the 'rooster tail' jet was working fine, then I noticed at the end of the day, there was no water coming out of the jet orifice on the rear deck. What the heck does that mean?
So this problem only happens under load. I have not pulled the impeller. I understand that a total impeller failure would allow the engine to rev up without moving the ski in the water. But would a partial problem with the impeller or wear ring that was somehow intermittent cause this problem? A drive shaft problem? What could cause gas or carb problems only under load?
The last service guy filled the oil tank and said it should work. I did notice the oil in the tank was down about an inch today, so the oil pump and oil line seem to be fine. I have been running pre-mix as well, but will no longer do this after this gas tank is finished and I replace the no doubt fouled plugs.
Is there anyone in southern or eastern Connecticut that I could talk to about this? It seems as if I am one fix away from having a ski that works very well. Thank you in advance. Peter