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Do you know that you can buy a cable and software to connect to a PC that will read all sorts of data from your Yamaha engine(s)? This includes not just engine hours, but even the hours in specific RPM ranges! As well as overheat warnings etc.
This thread explains how to hook it up and operate it.
Is your engine alarm constantly going off? Seems if you start and stop the boat properly 3-5 times it will turn it off. See this thread for more details, and please post there if this does or does not work for you. Also post your experience (if it is 3 or 5).
This modification can be used while being towed to prevent water ingesting into your cylinders or to get better pressure while flushing with fresh water to prevent losing it out the exhaust inlet.
If you are going to tow your boat above no wake speed you either need shut off valves OR you need to just clamp off the incoming water line from the pump
