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Thread: head question

  1. #1
    2000 GPRXP 4tec shooter98xpl's Avatar
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    head question

    well a gpr1300 riva head work on a 1200 gpr motor?
    SHOOTER


  2. #2
    2000 GPRXP 4tec shooter98xpl's Avatar
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    anybody?
    SHOOTER

  3. #3
    Hydrotoys's Avatar
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    Give a day or two. Not sure anyone knows. I know the water jackets are SIMILAR but not IDENTICAL. The way Fernando explained it to me, is that the R/D head has so much "flat area" around it, that they might fit.

    If I had to guess, I'd say the 13r head would fit both. Dunno.

  4. #4
    2000 GPRXP 4tec shooter98xpl's Avatar
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    well thats a 50/50 chance, thanks for the response. Anyone 100% positive?
    SHOOTER

  5. #5
    The cast Riva 1300 and 1200 are identical except for dome size of course. The cooling holes are the same on both heads. The gasket is what determines how the water flows into the head. If your boring the 1200 out to 1300 then you can use the 1300 head.

  6. #6
    Happily Self-Employed WFO's Avatar
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    Hey Shooter...I knew KNR had some heads and that you were looking, so I ask around a week ago. The heads will fit, but the inside diameter between the step is 84mm. Your piston is 80mm. The squish would be quite large. Everyone I talked to said "they wont work" or "dont use them".

    My .02

  7. #7
    Buaidh No Bas howestek's Avatar
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    Richard,
    I assume this is the "step" you are referring to. This is an R&D 45cc head. The measurement is 84mm.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  8. #8
    Happily Self-Employed WFO's Avatar
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    BINGO...That is a 1300 head

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