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Thread: Engine switch 750 to 700

  1. #1
    Junior Member
    Bike: 2014 NC700X 2018 NC750X 2008 Yamaha R6 2015 CBR 300R
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    Exclamation Engine switch 750 to 700

    I have a 2018 NC750X with dead engine wanted to know if its possible to fit a 2014 NC700x engine to the frame and the harness

  2. #2
    Senior Member Jt105's Avatar
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    Iíll be the first of many curious people to ask... What happened to the 750 and why do you think itís dead?

    Not sure about the swap. My guess is if itís a manual the odds are better. I would think a DCT version would have different shift settings programmed in the ECU.

    JT

  3. #3
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    gave it to a friend for a few months and he decided to ride it without checking oil levels or the coolant, in short i took the bike road it for a few kilometers and it knocked.

  4. #4
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    i'll also be shifting the harness, ignition and the ECU. The bike is a manual.

  5. #5
    Senior Member ste7ios's Avatar
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    I’m not aware of anyone who did that surgery... I guess you’ve to talk with an engineer who knows both models in depth.

    You may also have a look in service manuals but it will not be an easy task.

  6. #6
    Junior Member Janus's Avatar
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    from what I have read and understand, the 750 engine is just the 700 block bored-out. I read this in some articles talking about the end of the -700cc NC in the 2017 model year. Going forward all NC's are 750cc, but the bikes should be visually identical aside from the TCU that they put on there in '18

  7. #7
    Senior Member ste7ios's Avatar
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    That doesn’t mean that all of the mounting points are the same...

    Let us know if you’ve any progress.

    Good luck!

  8. #8
    Senior Member Engine switch 750 to 700 davidc83's Avatar
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    Quote Originally Posted by Janus View Post
    from what I have read and understand, the 750 engine is just the 700 block bored-out. I read this in some articles talking about the end of the -700cc NC in the 2017 model year. Going forward all NC's are 750cc, but the bikes should be visually identical aside from the TCU that they put on there in '18
    From what I have read, the piston shape has changed from the older nc700x (2012/2013) to the newer 750...so more than just a bore out...If the FI system is different, the computer mapping will have to be different; if the front sprocket axle is different length, lining up with rear sprocket may be difficult; does the fuel pump on the nc750x have same pressure as fuel pump on the nc700x (if same part number, probably), if not, problems with the EFI will occur....
    [SIGPIC][/SIGPIC]

  9. #9
    Senior Member Engine switch 750 to 700
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    I believe swingarm and sprocket carrier didn't change so alignment shouldn't be a problem.

  10. #10
    Senior Member Engine switch 750 to 700 dduelin's Avatar
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    The 745 cc engine has two counterbalancers and weighs a few kilograms more than the single counterbalancer 670 cc engine. It's not just a bored-out 670 cc motor.
    Dave

    GL1800
    NC700XD




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