Starboard engine will crank but will not start.Checked fuel,spark. Finally did compression test. getting around 50 psi on all 6 cylinders. All 6 spark plugs looked light tan.There were no catastrophic noises ever, just went out one day and it would not start.With all cylinders so low it seems like there is a valve issue common to all 6 cylinders,probably something to do with the timing belt.What I can see of the belt it looks like it's in good shape.How do I check for some kind of misalignment with the crank and cams?While troubleshooting this engine kept starting the port 225.Two days later port engine would not start.Checked fuel ,spark. Compression good,still will not start.