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Thread: Optimax 135HP

  1. #1
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    Optimax 135HP

    i am looking at a boat with 98 optimax 135hp engine. the engine has a knock at idle and goes away or can't hear it when it is running. for all the experts our there

    - does this sound like a piston pin wear?
    - is the optimax 2.5L block the same as other mercury 2.5L block?
    - hear about an injector upgrade that needs to be done to this engine for added reliabilty?
    - where can i buy the software if it exist (my laptop) to scan ECU?

    thank you

  2. #2
    Join Date
    Nov 2003
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    Miami, F_L_A
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    I have a 2000 135 Opti, and it does the same thing...

    JH

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