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Thread: GS1000 Motor in a GS750

  1. #1
    Join Date
    Apr 2014
    Location
    Rochester, NY
    Posts
    165

    Default GS1000 Motor in a GS750

    Hi gang - A GS1000 motor popped up on CL for $150. Condition looks a tad rough from the pics, but the price seems reasonable. Gonna look at it tomorrow.

    If I pick this motor up, how big a deal is it to swap motors in my GS750? Also, are there any "gotchas" that I should be looking for on the used GS1000 motor?
    '79 GS750 - 4th and current ride...first since 1983
    '73 CB350 - 1st ride
    '76 GT750 - 2nd ride - the "water buffalo" - sold to buy an engagement ring
    '79 RD400F Daytona Special - 3rd ride, the last of the street legal US 2-strokes - sold to buy a house

  2. #2
    Join Date
    Jun 2005
    Location
    southwest oHIo
    Posts
    35,925

    Default

    You have a '79 750, which is a plus.

    If the 1000 engine is from a '79 or older chain-driven bike, it's pretty much a drop-in.

    If the 1000 engine is from an '80 chain-driven bike, you will have to be sure to also change the carbs and the ignition systems.

    If the 1000 engine is from a shaft-driven bike, forget it.

    .

    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.)

  3. #3
    Join Date
    Apr 2014
    Location
    Rochester, NY
    Posts
    165

    Default

    Thanks Steve. The GS1000 motor is from a '79. Not sure if it's from a chain or shaft drive, but will be sure to find out.
    '79 GS750 - 4th and current ride...first since 1983
    '73 CB350 - 1st ride
    '76 GT750 - 2nd ride - the "water buffalo" - sold to buy an engagement ring
    '79 RD400F Daytona Special - 3rd ride, the last of the street legal US 2-strokes - sold to buy a house

  4. #4
    Join Date
    Jun 2005
    Location
    southwest oHIo
    Posts
    35,925

    Default

    If it's a '79, it pretty much has to be a chain.

    Unless it was one of the early shafties that was MADE in the last part of '79.

    The 1000G (shafty) was introduced for the 1980 model year, but some places claim the year of the bike by the production date, and the first of the '80 model year production might have come down the assembly line as early as August or September of '79.

    .

    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.)

  5. #5
    Join Date
    Apr 2014
    Location
    Rochester, NY
    Posts
    165

    Default

    Owner confirmed that it is chain drive. I'm going to look at it tonight, and will try to find out more about it's history.....like why it's out of the bike, when it ran last.

    Another question - Will the Vance Hines headers on my GS750 bolt directly on the GS1000 motor, or will I have to modify them?
    Last edited by knotscott; 09-23-2019 at 07:09 AM.
    '79 GS750 - 4th and current ride...first since 1983
    '73 CB350 - 1st ride
    '76 GT750 - 2nd ride - the "water buffalo" - sold to buy an engagement ring
    '79 RD400F Daytona Special - 3rd ride, the last of the street legal US 2-strokes - sold to buy a house

  6. #6
    Join Date
    Jul 2019
    Location
    St. Augustine, FL
    Posts
    60

    Default

    It's not plug and play... I'm in the middle of this swap. Foot pegs, motor mounts, #whyamidoingthis LOL

    10.16.2019 775.jpg

  7. #7
    Join Date
    Jul 2011
    Location
    Oklahoma
    Posts
    2,817

    Default

    I guess my question would be, why bother??
    The suspension and frame on the 750 aren't any better, and the weight difference between the two bikes is largely in the engine.
    Be far easier (and probably cheaper) to just buy a GS1000.
    Rich Desmond
    1980 GS1000S
    2007 V-Strom 650
    2008 Ducati 848
    2002 DR-Z400S
    1999 SV650 (race bike)

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