Well not sure where to start but pretty bumming, long cold winter and when I put my boat up it was running fine. It started right up and idle fine, idle out to the no wake zone and then ran it for a short period of time, then while running it just died, like the kill switch was pulled. It started right back up and kept doing the same thing then it final started running really rough, no power etc. No smartcraft alarms etc. I have had this issue before when I lost a coil and thought that was the issue, after troubleshooting I could tell it was #3 cylinder that was not working properly.
Idled back from my lift and put it on the boat and pulled the plugs, #3 was wet and yucky, did a compression test on #3 and it doesnt even register on my guages, the other 2 are 120psi. So its not a coil and its much bigger issue, I am not the original owner but since I have gotten it I have done all of the maintenance work on it. Now I am in the process of figuring out what exactly is wrong with #3 cylinder and is a powerhead my only option. I have done a leak down test on the cylinder and its bad also, almost no compression at all, no air comes out when you turn it over, which I can do by hand. I have take the fuel rail off and but do not have a bore scope to see further inside.
Here are my motor details, 115 Optimax 2005, serial# 1B026476
Always treated fuel Marine Stabil, Penzoil xlf oil
And the kicker is I only have 145hrs on the engine
I plan on rebuilding myself but I really need to determine the cause of failure so it doesn't repeat itself. Can I rebuild the one cylinder or is the reman head from merc the really only way to go, the engine is not siezed but until I take it apart I am not sure what is causing the lack of compression.
At this point taking any suggestions I can get, thanks. :)