1997 SeaDoo GTX 787 Project Jet Ski Will it Run Sitting for 8 YEARS

I bought this 1997 SeaDoo GTX for $550. The previous owner took it on trade for work performed. He said that it needs RAVE valves, and he included the parts to rebuild the valves. The ski had been sitting outside for 8 or 9 years uncovered. So far it seems that I got lucky with this ski, the engine fired right up and compression is 150 psi on both cylinders. The ski needs to be tested on the water to see how it performs under load, but I expect it to be fine.