Late last year I picked up a 2120 Parker Sport Cabin, powered with a 150 Yamaha 2 stroke (TXRA), all 2002. The boat only had 400 hours on it and it ran great during the sea trial. During the first few months of use I would occasionally get an overheat alarm (no real pattern when it would come on), I would shut the engine down and wait a few minutes and then it would fire up (no alarm) and run fine. Some trips there would be one alarm, some trips up to 4 periods of alarm. The water pump has always been pumping, and the engine runs very smooth (even when in alarm mode). My boat is at a small marina and there is engine service and they told me to keep running the boat and see if the alarm clears up with use. Happily after 2 months all the alarms stopped and I had no issues. Unfortunately, the alarms returned over the past 2 trips. Weirdly, did not get any alarms during the warmest water period in Long Island Sound. (Note, I'm in CT and fishing/boating season is fast coming to a close so I won't be running the boat much longer this year.)
In my chats with the marina, the plan is to replace the water pump, thermostats, etc. in the spring before launch. I don't have the entire service record for the engine, my marina did replace the fuel pumps and did work on the fuel system prior to launch this year.
I was pondering repowering with a new Yamaha 200 In Line 4 but with only 470 hours on the engine and a fuel curve that is not that much different than the 150 2 stroke it does appear keeping the old 2 stroke running makes more sense. The boat and engine appears to be well maintained, just not run enough. (I put 60 hours on it this year, so that is being corrected.) The engine is flushed at the end of every trip for at least 15 minutes.
Just looking for some input on next steps. Not sure if a sensor ever goes bad. I don't like putting more money in an old 2 stroke but at the same time the engine matches this boat fairly well and runs great except for the alarm issue (which I thought was behind me). I've watched the videos on pulling the heads for clear out internal blockages but I didn't want to go that far.
My last trip - 5 miles to the fishing spot - 2 alarms going to the fishing spot, shut down for a minute each time, the boat ran fine and came out of alarm mode (3500-4000 RPMS). Trip back - 4200 RPMS, no alarm at all.
Thanks- Jack
In my chats with the marina, the plan is to replace the water pump, thermostats, etc. in the spring before launch. I don't have the entire service record for the engine, my marina did replace the fuel pumps and did work on the fuel system prior to launch this year.
I was pondering repowering with a new Yamaha 200 In Line 4 but with only 470 hours on the engine and a fuel curve that is not that much different than the 150 2 stroke it does appear keeping the old 2 stroke running makes more sense. The boat and engine appears to be well maintained, just not run enough. (I put 60 hours on it this year, so that is being corrected.) The engine is flushed at the end of every trip for at least 15 minutes.
Just looking for some input on next steps. Not sure if a sensor ever goes bad. I don't like putting more money in an old 2 stroke but at the same time the engine matches this boat fairly well and runs great except for the alarm issue (which I thought was behind me). I've watched the videos on pulling the heads for clear out internal blockages but I didn't want to go that far.
My last trip - 5 miles to the fishing spot - 2 alarms going to the fishing spot, shut down for a minute each time, the boat ran fine and came out of alarm mode (3500-4000 RPMS). Trip back - 4200 RPMS, no alarm at all.
Thanks- Jack
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