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Thread: 750 engine into 650 frame?

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  1. #1
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    Default 750 engine into 650 frame?

    Have a 1981 650 with bad engine - can get a 1980 750 engine still in good shape - both shaft drive - can I do such a transplant? Are there issues, will frame hold up etc. Input will be much appreciated

  2. #2
    salty_monk's Avatar
    salty_monk is offline Forum LongTimer GSResource Superstar
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    You sure it's a 750 and not an 850? If it's a 750 maybe that's a SA special model we didn't get here......

    The 650G & 850G engines are quite different I believe

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  3. #3
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    Quote Originally Posted by Danie.e View Post
    Have a 1981 650 with bad engine - can get a 1980 750 engine still in good shape - both shaft drive - can I do such a transplant? Are there issues, will frame hold up etc. Input will be much appreciated
    I donít believe a GS750 was made with shaft drive for export markets. The progression on shafties from GS650G onwards is here
    https://www.suzukicycles.org/GS-series/index.html
    1982 Suzuki GS650G

  4. #4
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    Don't worry about the hp stuff..the shafties are a different animal. Get your bike running well and safely, and i think you'll find its performance interesting . I test rode one back in 1981 and was impressed: I got busy though ,and had to wait 27 years to get one.
    1981 gs650L

    "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

  5. #5
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    The 750G was for two years only, and only in Japan.

    As Salty Monk mentioned, the 650 and 750 are considerably different. Until a few weeks ago, I had two 650 engines here, I could have measured the differences, but the 650 is somewhat based on the 550 and the 750 is the basis for the 850. I do not think the 750 will replace the 650 without major surgery on the frame.

    .

    mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
    hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
    #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
    #2 son: 1980 GS1000G
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  6. #6
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    Here is a picture of the bike - owner assures me that it is a GS750 and that it is a shaft drive. - Thanks for the replies on my question. Guess I will not take the plunge for such a transplant as I do not wish to do major surgery.

  7. #7
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    Several things don't look quite "right" with that bike.

    If you have the chance to examine it in person, look at the front of the engine to see what displacement is cast into the base of #1 cylinder. See if it says 673 or 748.

    You can also look at the VIN plate or the stamping on the steering tube at the front of the frame, it will show the model. The engine itself also has a serial number. The first part will give a big hint to the displacement.

    Not that it matters for the engine swap, but that bike is an L, and the seat is not securely attached. Not so sure about the tank, either.

    .

    mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
    hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
    #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
    #2 son: 1980 GS1000G
    Family Portrait
    Siblings and Spouses
    Mom's first ride
    Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
    (Click on my username in the upper-left corner for e-mail info.)

  8. #8
    Gorminrider is offline Forum Sage Past Site Supporter
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    From AdmiralBaez's link, it seems that the 750G's were 850G's with a smaller engine to suit japan's 750CC limit. So a transfer to the 650 frame is a nogo. Here's a 750GL from that site.



  9. #9
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    650G with an L seat & tank?
    -Mal

    "The only reason for time is so that everything doesn't happen at once." - B. Banzai
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    78 GS750E

  10. #10
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    Quote Originally Posted by allojohn View Post
    650G with an L seat & tank?
    Nope.

    650GL.

    Or, if you were in Japan in 1981, 750GL.

    .

    mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
    hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
    #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
    #2 son: 1980 GS1000G
    Family Portrait
    Siblings and Spouses
    Mom's first ride
    Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
    (Click on my username in the upper-left corner for e-mail info.)

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