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1980 GS850 Top End on 79 GS750 Engine?

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    1980 GS850 Top End on 79 GS750 Engine?

    I have a 1982 GS1100G engine that I will be putting in my 1980 GS850G (I got the engine and rolling chassis from Steve). That leaves me with a spare 1989 GS850 engine. I also have a 79 GS750 that has bad compression.
    I'm thinking of transferring the GS850 top end onto the GS750 bottom end. As far as I can tell (per the search function) this is a direct swap. Am I right? Anything I have to look out for? Any comments? Thanks.

    #2
    That's a relatively easy one. You can either bore the 750 block & fit the 850 pistons & head or carefully remove a small amount of metal from spots in the 750 crankcase until the 850 block fits the 750 bottom. There's at least one person on the forum who has done the second option, but I don't know if he's gotten the bike running yet.

    Terry

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