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beef'n up displacement!!!??

Discussion in 'XJ Modifications' started by 209SECA, Jun 14, 2010.

  1. 209SECA

    209SECA Member

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    Will xj750 cylender and pistons fit an XJ650 case? Is this the only difference between the 650 and 750?
     
    209SECA, Jun 14, 2010
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  2. nkavanau

    nkavanau Member

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    Here are a couple of side by sides. Both 81's. The 750's bore is 2 mm greater. Aslo a totally different stroke, so different crank. Think you would be out of luck.
    Of course, without the particulars on the 2 engines, I couldn't say with any certainty, but highly doubt they would be interchangable.

    Make Model Yamaha XJ 650 Maxim
    Year 1981
    Engine Air-cooled four stroke, transverse four cylinder, DOHC, 2 valves per cylinder,
    Capacity 653
    Bore x Stroke 63 Ñ… 52.4 mm

    Model Yamaha XJ 750 Seca
    Year 1981
    Engine Air cooled, four stroke, transverse four cylinder, DOHC, 2 valves per cylinder.
    Capacity 749
    Bore x Stroke 65 Ñ… 56.4 mm
     
    nkavanau, Jun 16, 2010
    #2
  3. PainterD

    PainterD Active Member

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    Too bad you don't live closer. I have an entire 750 Maxim engine you could have just for picking it up. Free!! I don't know the history of the engine or the miles (got it for a parts bike)
     
    PainterD, Jun 17, 2010
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