[Search for users] [Overall Top Noters] [List of all Conferences] [Download this site]

Conference vicki::boats

Title:Powerboats
Notice:Introductions 2 /Classifieds 3 / '97 Ski Season 1267
Moderator:KWLITY::SUTER
Created:Thu May 12 1988
Last Modified:Wed Jun 04 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:1275
Total number of notes:18109

425.0. "Johnson outboard has no power" by WMOIS::YOUNG () Thu Jun 29 1989 11:46

    
     Help !!  A friend of mine has a 1969 85 hp johnson that will only
    run up to half throttle beyond that the engine dies. Basic things
    have been checked, gas line, replaced the tank. If the operator
    holds in the choke button it will run fine. Any hot mechanics
    have an idea what it is ?
            Thanks for your anticipated help.
    
                           Evey
T.RTitleUserPersonal
Name
DateLines
425.1leaning outSICVAX::SCHEIBELU can Teach A new dog UL TRIXThu Jun 29 1989 12:017
    sounds like a dirty fuel filter, bad fuel pump, broken vacuum line off
    of manifold or clogged high speed orifice plugs. If you choke it and it
    runs ok that usually means you are leaning out the lack of air/extra
    gas makes the motor pick up speed. Let me know how you make out.
    
      Bill
    
425.2CSCMA::LEMIEUXThu Jun 29 1989 17:477
    Might want to check for a stuck choke also.
    
    
    Good luck,
    
    Paul
    
425.3DEAD Auto-chokeTIDES::DAVIDGeorge P David, DTN 296-5403Fri Jun 30 1989 08:406
    	Some of the older Johnsons have a psuedo-automatic choke that
    	stays ON when it dies.	All you have to do is use the manual
    	override button on the front of the engine itself.  I think
    	you pull it out to start and then push it in to run, or vise
    	versa.	It sounds like you've kinda discovered it already.
    	Also it should stay in by itself.
425.4plugged someplace or an air leakBIZNIS::CADMUSFri Jun 30 1989 11:1027
    
    I've had a similar problem twice in the past- the rubber fuel line
    starts to distintegrate and little pieces get into the feul opening in
    the carb.enough fuel gets by to run at slow speed, but not enough at
    high speed.
    
     I'd check the choke, clean all fileters, and check the carb for
    dirt/junk around the inlet.
    
     It's definetly starving for fuel and is probably a blockage.
    
     I also ran into this last year with a freind's baot with a 125 FORCE
     the (*^&&*&$@#*&^ dealer had a real slipshod connection between the
    rubber fuel hose to the engine and the copper line from the tank- 
    under full load, enough air would blled through, that the fuel pump
    could pump only slightly less than the engine required.
    
     The engine would pick up , go to full rpm and stay there for about
    10 min and then  sslllooowwwlllyy slow down to about 2000 rpm. Once the
    fittings were hooked up proper and leak free- no problem.
    
    
     I would look for plugged line or a leak in one of the lines on the
    suction side of the fuel pump.
    
     Dick
    
425.5Check the "O" ringsALLVAX::ONEILLFri Jun 30 1989 14:088
    
    	Check the ends of the fuel lines. Many of the connectors use
    "O" rings. If the "O" ring gets wore it will allow air to get into
    the system.
    
    	Good Luck
    
    	Mike
425.6Shorten fuel line?WFOV12::KULIGTue Jul 18 1989 08:389
    re .0
    I had the same problem, tried everything in rep .1, changed fuel
    lines, cleaned carb, cleaned fuel filter.  The problem turned out
    to be the length of the fuel line from the fuel tank to the motor,
    it was too long for the fuel to get to the motor.  I shortened it
    by about 2 1/2 feet.  Runs great now.
    
    mike
    
425.7What note?SALEM::GILMANMon Jun 10 1991 15:445
    I have done a dir/title for a recently added to note about 'scary
    scenes' or something similiar to that title.  It was about spooky
    things people saw on dives. I can't remember the title well enough for
    dir/title to be able to id. it.  Does anybody know what the note number
    is?  Tx.  Jeff
425.8One of the later ones in SCUBAGEMVAX::HICKSCOURANTTue Jun 11 1991 08:274
    Jeff---
    That note is in RAINBO::SCUBA. It's called "Spooky scenes...." 
    
    John H-C