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    2017 Yamaha 150 hp - 4 stroke warning alarm

    i swapped the t-stat for a new one. I ran the engine to 5K, It ran fine. no overheat. I tested the old T stat in hot water, It opened up and worked fine. This weekend i will run full throttle, Maybe there was a clog in the cooling system that is now disloged
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    2017 Yamaha 150 hp - 4 stroke warning alarm

    Thanks, I will check t-stat this weekend.
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    2017 Yamaha 150 hp - 4 stroke warning alarm

    no gauges, only the alarm. I am thinking that the thermostat is only partially opening, causing the alarm at high speed. I will replace with a new Yamaha t-stat and see if that fixes the alarm problem,
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    2017 Yamaha 150 hp - 4 stroke warning alarm

    I bought this engine new. sits on a 2117 19 foot Hurricane deck boat. I have changed the impeller and housing twice. The engine only has 203 hours on it. Last impeller change was May 2022. I put the boat in the lake, fresh water use only, last week, and started it up. No problems. Pee hole was...
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    150 f stroke won't start (2017)

    Battery died , recharged, now 12.95 volts, Reinstalled battery, all gauges and trim and tilt work. On trying to start, battery makes a clicking sound. No started engagement. Ideas? Sullmate
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    over heat alarm 150 hp Yamaha 4 stroke 2006

    replaced the water pump in both engines. No alarm. Engine suffered a salt water leak in the powerhead the sprayed the engine with salt water. This caused many electrical parts to corrode. Engine was tested in a test tank. No alarm. Can't water test till spring. COLD here in Ct.
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    over heat alarm 150 hp Yamaha 4 stroke 2006

    Update. total estimate w/ tax $K. Includes New Stator / pulser coil base assembly New oil pump for the port engine. New balancer assemblies for both engines. O rings, crankcase seals and new anodes. Parts,( All Yamaha) total $2418. Labor, 11 hours $1430. ($130 per hour) Work is done off season...
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    over heat alarm 150 hp Yamaha 4 stroke 2006

    The computer spit out a code for another sensor that has to be replaced. The mechanic said the stator and rectifier must also be replaced due to excessive corrosion. The engine (2006) has always been used in salt water in the northeast. I have not received the total bill estimate. Bummer!
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    over heat alarm 150 hp Yamaha 4 stroke 2006

    Update. The Yamaha mechanic says it is definately another sensor besides the overheat sensor that I replaced. Not sure what sensor or where it is. I will continue to update when the mechanic does the work.
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    over heat alarm 150 hp Yamaha 4 stroke 2006

    Max rpm for this engine is about 5200 rpm. not higher
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    over heat alarm 150 hp Yamaha 4 stroke 2006

    its a steady beeeeeeeep. Engine cuts back to a slower speed. Turn off engine restart no beep. No beep at all until boat is driven a while at higher rpm. Engine does not run hot. is there a water pressure sensor. ??
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    over heat alarm 150 hp Yamaha 4 stroke 2006

    My 24 ft. Regulator has 2 engines. Both 2006, 870 hours. All salt water use. The port engine overheat alarm goes off at 5-5600 rpm. I have replaced the impeller, thermostat and overheat sensor. No change. Is there a water pressure sensor on this engine? THE ENGINE IS NOT OVERHEATING. Runs at...
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    what causes an overheat alarm when the engine is not overheating

    Yamaha -2006- 150 hp 4 stroke. (850hours). Engine starts fine, pee hole shows a steady stream. Water pump impeller is less that two years old. When engine hits around 3800 rpm. the Alarm sounds ( steady beep). Stop, walt 15 seconds restart the engine, runs fine, no overheat signal the rest of...
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    Yamaha 150 hp - 4 stroke - 2009

    update. The welder patched up the hole in the engine block. It now works well. Cost $300 for the weld. Some parts on the outside of the engine block were replaced as well, due to the salt water that was sprayed when the leak developed.
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    Yamaha 150 hp - 4 stroke - 2009

    Thanks for all input. I am having the boat trailered to a local airport for a welder, who welds aluminum on airplanes. Charge for the weld is $300. I am going to give it a try. Will let you all know how it goes. Also, corrosion is also a factor as the boat is used in salt water. Still an odd...
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    Yamaha 150 hp - 4 stroke - 2009

    Have this engine, 800 hours. Last weekend the engine sprung a water leak at the top of the engine. -. It wasn't a hose, it was a crack that developed in the block ! Almost a perfect circle about 1/2 inch wide. The mechanic blamed this on a flaw in the original casting of the block. Ever hear of...
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    2001 , 115 h p 2 stroke stalls Serial # OT263257

    The above engine has worked fine until now. Engine was tuned. New plugs, filters and lower unit fluid. Engine starts right up. After 5 seconds the engine shuts down immediately., This will happen 4 or 5 times in a row. Finally with high idle on high the engine will catch and run until it is...
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    1994 Force (Mercury) 9.9 HP serial #OE105918

    This engine has low hours, new plugs, new t-stat, new impeller, new lower unit oil. It started right up. It ran for about 10 minutes a full speed, then ran for another 10 minutes at only 1/2 speed, then died totally. Gas and oil were fresh. Tried to pull start with spark plug removed and...
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    2000, 115 HP Merc - fresh water flush.not working

    This engine has a built in fresh water flush. The flush hose goes to the temp sensor on the top back of the engine. When the hose is connected, and the water is turned the water goes to this sensor and stops. It seems the engine is not gettting flushed with fresh water. The temp sensor valve...
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    Yamaha 150 HP 4 stroke 2017.

    I want to confirm the metric size of the anode trim tab bolt. I know it is a deep socket. It's either 14mm or 13 mm. Please advise. Thanks, Sullmate
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