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650cc engine to 750cc

Discussion in 'XJ Modifications' started by Jim Lahey, Apr 6, 2015.

  1. Jim Lahey

    Jim Lahey Member

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    Can a 650cc be rebuilt to 750cc?
    I'm guessing different rods & pistons, larger carbs but that probably means different head too.

    Must be a completely different engine, huh?
     
    Jim Lahey, Apr 6, 2015
    #1
  2. FtUp

    FtUp Well-Known Member

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    it would be cheaper and easier to drop in a good used 750.

    FU
     
    FtUp, Apr 6, 2015
    #2
  3. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Yes on both counts.
     
    k-moe, Apr 6, 2015
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    FtUp likes this.
  4. Greenbike

    Greenbike Member

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    Make sure you get the carbs too, and the ignition module.
     
    Greenbike, Apr 29, 2015
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  5. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    If you mean for an engine transplant, then yes.

    If you mean for building the engine out to 750cc, that depends on what route he takes. Doing it the way that Yamaha did he'll also want the crankshaft (for the longer stroke) and the cams.
     
    k-moe, Apr 29, 2015
    #5
  6. Greenbike

    Greenbike Member

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    Yep, for an engine transplant.
     
    Greenbike, Apr 29, 2015
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  7. Toomanybikes

    Toomanybikes Well-Known Member

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    Engines are the same size on the outside I just picked up a crashed 750 for $100 cheapest way to make my 2nd 650 Seca in to a super seca has 4/1 header on it now 1st one is all stock
     
    Toomanybikes, Apr 30, 2015
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    Jim Lahey likes this.

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