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GS850G / GS1000G Engine Swap Questions

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    GS850G / GS1000G Engine Swap Questions

    I am installing a 1980 GS1000G engine into a 1980 GS850G chassis and have some questions.......

    I notice that there are different part numbers for headers for GS1000G and GS850G bikes, is this because of differences in the engines or the chassis ? Which header do I need to use ? For a 850 or 1000 ?

    Are there any other issues that I might run into in doing this swap ?

    ANY info will be GREATLY APPRECIATED !

    THANKS !
    -D Payne

    #2
    You need to use the GS1000 drive shaft, I don't think the 850 pipes will fit but i don't know for sure, I would be interested to know if anyone has tried as I am planning the same swap next year (I have the motor) You will have to make your own rear motor mount. Other than that it is supposed to be an easy swap

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      #3
      Re : driveshaft

      Can the 850's driveshaft be modified to work with the 1000 motor ? What is different ?

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        #4
        The 850 driveshaft bolt pattern is smaller IT can not be modified

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          #5
          Re : driveshaft

          Can the flange from the 850's transmission output bolt onto the 1000's transmisson output shaft ?

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            #6
            The 850/1000 both use the same seal & brg The flange may work.
            THE BEVELED drive gears themselfs are not interchangable between the 850/1000

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