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Top end rebuild

Discussion in 'Yamaha LX210, LX2000 and LS2000' started by piper84, Mar 27, 2018.

  1. piper84

    piper84 New Member

    Messages:
    22
    Ratings:
    +4 / 0
    Boat Make:
    Yamaha
    Year:
    2000
    Boat Model:
    LS
    Boat Length:
    19
    I pulled the cyl head off and found damage on aft piston that I could not see otherwise also elongated Cyl wall in spots. This is the cyl at 90 psi comp ck even lower when wormed up. I am replacing all three pistons and ordered a remanufactured cyl head. Was recommended by supplier to also rebuild the carbarators. Dammage to piston side was on the exhaust side most likely due to a lean running carb. So I’m going to rebuild all six carbs and replace oil lines.
     
    • Like Like x 1
  2. boudin

    boudin Member

    Messages:
    58
    Location:
    Houston, TX
    Ratings:
    +48 / 0
    Boat Make:
    Yamaha
    Year:
    2008
    Boat Model:
    AR
    Boat Length:
    21
    Yes, dirty carbs and oil lines coming off are the #1 killer of 2-stroke Yamaha's. Carbs should be rebuilt every 2-3 years. Try to use Mikuni or WSM kits. Go back with stock high/low mixture screw settings--check greenhulk.net for stock values, but also make note of the # of turns when disassembling the carb body. If you add aftermarket flame arrestors, that will also lean out the mixture--there are formulas on greenhulk.

    You might also want to pickup an impact screwdriver for stuck screws.

    -Greg
     
  3. piper84

    piper84 New Member

    Messages:
    22
    Ratings:
    +4 / 0
    Boat Make:
    Yamaha
    Year:
    2000
    Boat Model:
    LS
    Boat Length:
    19
    Has enyone ever tried to use an infored digital hand held thermometer to detect a lean our hot running cylinder?
     

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