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  1. #1
    Join Date
    May 2009
    Location
    Raleigh, NC,
    Posts
    4

    Default Just had carbs rebuilt (ne

    Just had carbs rebuilt (new plugs and filters)and sync'ed by local Honda dealer. Motor runs like chanp at high and low RPM for about an hour....then gradually at low RPM engine runs rough and eventually will stall. Dealer thinks still might be a fuel system issue...is there coil or timing module potential to explain this? Once motor is cooled...runs like champ again??

  2. #2
    Join Date
    Sep 2006
    Location
    SF BAY AREA, CALI, USA
    Posts
    8,649

    Default they did not sync it right

    they did not sync it right
    HUMAN BUILT = HUMAN FIXED

    CERTIFIED MARINE TECHNICIAN

    WWW.JUSTINTIMEMARINE.COM

  3. #3
    Join Date
    Sep 2008
    Location
    El Cajon, Ca., USA
    Posts
    107

    Default "Try checking for a air leak a

    "Try checking for a air leak at fuel line connector, the o-ring onside can leak and cause this problem."

  4. #4
    Join Date
    May 2009
    Location
    Raleigh, NC,
    Posts
    4

    Default "Honda Dealer has tried three

    "Honda Dealer has tried three times on carb rebuild....seems that a needle valve gets stuck on one of the carbs??....ran today for three hours....all is fine, then restart after a short fishing break, bam…backfire through carb and rough idle, then something lets loose and it runs... ok. I’m fit to be tied!! Will discuss the air in fuel line possibility with the dealer. thanks."

  5. #5
    Join Date
    Sep 2008
    Location
    El Cajon, Ca., USA
    Posts
    107

    Default Do you have a water separator

    Do you have a water separator fuel filter on your boat?

  6. #6
    Join Date
    May 2009
    Location
    Raleigh, NC,
    Posts
    4

    Default "yep, also talked with the de

    "yep, also talked with the dealer and he had already replaced the fuel line o-ring...."

  7. #7
    Join Date
    Jun 2009
    Location
    Stevensville, MD, USA
    Posts
    3

    Default "I have a similar problem with

    "I have a similar problem with one of My BF90's. After warm up cylinder # 3 drops out. What makes it hard to troubleshoot is that it only happens after warm-up and is intermittant. Seems to Me if it were a carb issue then it would happen all the time (not just after the engine is warm)although I did go through the exercise of draining My fuel tanks/ replaceing filters, etc earlier this spring. The fact it is heat related led Me in the directions of an electrical issue (possibly something expanding as it heats up), but I have swapped most of the cylinder specific electrical components and the problem still occurs (furtunatly I have 2 BF90 on the boat so I can swap parts for troubleshooting)"

  8. #8
    Join Date
    May 2009
    Location
    Raleigh, NC,
    Posts
    4

    Default "I may have the answer....ran

    "I may have the answer....ran boat Friday for 5 hours flawlessly, then had the poor running problem happened again,... called my Honda dealer from my boat and he had mechanic come out to the marina. This time I had an intermittent overheat/low oil pressure alarm....(but not always). When putting motor to neutral, then in gear again...problem went away. Mechanic said when this alarm occurs, ignition systems cuts out spark to one of the cylinder, to limit engine RPM. This could be caused by a bad sending sensor or thermostat. In any case, fuel going into a hot cylinder without ignition is definitely going to make the motor run badly. Monday they are checking this sensor to see if this is the problem....hope it is...and hope this might help you too."

  9. #9
    Join Date
    Sep 2006
    Location
    SF BAY AREA, CALI, USA
    Posts
    8,649

    Default "well they need to replace the

    "well they need to replace the parts not re-sue parts!!

    also HONDA DUDE told me if you sand down the needle rigges a tiny bit, it will not stick!"
    HUMAN BUILT = HUMAN FIXED

    CERTIFIED MARINE TECHNICIAN

    WWW.JUSTINTIMEMARINE.COM

  10. #10
    Join Date
    Jun 2009
    Location
    Stevensville, MD, USA
    Posts
    3

    Default "My problem became non intermi

    "My problem became non intermittant yesterday so I pulled carb # 3 off and disassembled and cleaned . problem appears to have gone away for the moment. Fish net came in handy when I dropped some parts off the stern of the boat during the process. I suggest having an intake manifold gasket on hand, mine came apart during disassembly."

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