Recent content by iammarcuse

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    40 Yamaha Vibrates and Stops Moving Forward

    1984 Yamaha 40hp 2 stroke. It is a friends boat and I am going out with him on the water this week. It starts and runs fine, but all of sudden the motor starts to vibrate louder and louder and the boat slows down and comes to a stop. I stopped by his house and the prop looked like it had a...
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    Optimax dies randomly. Code: Engine Data Bus

    2004 Optimax 225 on a 21' Ranger. The motor will cut out instantly while underway. No sputtering or loss of rpm first. It literally just dies completely like you turned off the key or hit the kill switch. Sometimes 10 times a day, sometimes not at all. The smartgauge reads "Engine Data Bus". The...
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    How do I remove kill switch from Mercury Commander 4000 control

    I have a 2004 Ranger with a Commander 4000 shifter. Everything on these boats is enclosed. Just want to remove the kill switch to test it as i suspect it is faulty. I cannot seem to figure out how to get the control off. 3 bolts have nuts on them which i cannot access and 3 bolts screw into...
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    150 Pro V top cylinders not sucking... which sucks.

    I have a 1990 PROV150LD. that stumbles at idle and often coughs and stalls. I rebuilt the carbs and set every thing to spec. The motor is running great off idle and turning 5500 rpm at wot. After tinkering with the idle adjustments I noticed I was getting almost no vacuum in the top 2...
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    6.2L Bravo II seawater pump out of alignment?

    Hi I have a 2004 6.2L Mercruiser with Bravo II drive. Ser #OM695430 The serpentine belt is wearing prematurely and you can see the black dust on the engine compartment. The tension is correct but the seawater pump pulley looks out of alignment to me as it does not run lined up with the other...
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    Yamaha ProV running like crap. Have run out of troubleshooting ideas. Reeds?

    I have a 1990 PROV150LD. It idles poorly and stalls and will not make full power under way. Sometimes it runs better than others and but always surges even if running better. I have run through most troubleshooting procedures. Compression 95-100. Good spark, new plugs, good fuel pressure...
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    6.2L MPI - slow cold idle. How do you test ECT and IAC?

    I have a 2004 6.2L MPI Mercruiser serial number OM695430. It runs perfectly except for a slow idle when cold. After cold starting it idles at only 500 RPM and will stall if you put it in gear. When the engine warms up it idles at 600 and runs flawlessly after that. Manual #31 says to check...
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    How do you test Yamaha V6 recirculation valves?

    I have a 1991 ProV 150 Yamaha that has a chronic lean sneeze and often times stalls at idle. It runs fine off idle and makes 5500 RPM at WOT. I have removed and cleaned carbs twice. They are spotless and every jet and passageway is clear as checked with compressed air. It has new spark...
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    1991 150 Pro-V - Can't get rid of lean sneeze... Gesundheit!

    I have a 1991 P150 TLRP. It has developed a lean sneeze at idle and will often stall after the sneeze. Otherwise it runs well and gets 5500 WOT. It does however occasionally stumbles while at cruise as well. Pulled the carbs and gave them a thorough cleaning... everything looked spotless...
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    Rodbolt. Can you tell me which wires to read on TPS? No one else seems to know.

    I have a 1990 225 ETLD 2 stroke carbed motor. It actually runs fine but during routine maintenance I wanted to check the TPS voltage since it regulates the timing. I jury-rigged a way to read the voltage from the TPS but am not 100% which wires to read. That Manual does not say. My guess is it...
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    225 ETLD: Reading TPS Voltage, Which Wires?

    I have a 1990 225 ETLD 2 stroke carbed motor. It actually runs fine but during routine maintenance I wanted to check the TPS voltage since it regulates the timing. I jury-rigged a way to read the voltage from the TPS but am not 100% which wires to read. That Manual does not say. My guess is...
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    1990 225 is running too well! But seriously, anyone seen something like this?

    This is my first season with a 1990 225ETLD. Worked out a few little bugs and it is running like a charm. It is mounted on a bass boat with the motor mounted with the propshaft 3" below pad, same as my last motor. There is one thing it does that I have never seen before. While cruising, if I...
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    Anyone know the pilot screw setting for a 1993 225 TLRR?

    I have a 1990 225 ETLD. The previous owner put on brand new carbs... but from 1993 225 ETRR. I have no idea why. I think he actually thought the motor was a 1993. They are different carbs in that the 1990 has various size jets and the 1993 has all the same. I am hoping that that won't make...
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    130 Yamaha floats; less is more right?

    I have asked this question before but never got a reply so am trying again. I have a 1989 Yamaha 130 ETF. It runs perfectly but after about 20 hours or so plug #2 will foul. Upon advice here I replaced the fuel pump diaphrams and cleaned carbs. While doing so I discovered all 4 floats were set...
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    Float height question 130 Yamaha

    I have a 1989 Yamaha 130 ETF. It runs perfectly but after about 20 hours or so plug #2 will foul. Upon advice here I replaced the fuel pump diaphrams and cleaned carbs. While doing so I discovered all 4 floats were set at .75". I reset them to the specified .63". It would seem to me that...
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