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Thread: Need more power

  1. #1
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    Need more power

    Wy wife wants to ride on back and she is heavy. I'm going to need more power. Anyone know how large the NC 700 motor can be bored out to.
    Last edited by rjarrell; 28th November 2017 at 19:49. Reason: edit

  2. #2
    Senior Member rippin209's Avatar
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    Quote Originally Posted by rjarrell View Post
    Wy wife wants to ride on back and she is heavy. I'm going to need more power. Anyone know how large the NC 700 motor can be bored out to.
    That's allot of work for minimal gains.
    When me and my wife combined weighed over 500lb then add riding gear, loaded side cases and the frunk being loaded with tools and electronics there was around 700lb on the NC and the suspension could have been better (more so then usual) but power wise it was the same as 300lb on it.
    We've rode over small mountains around town and down the freeway without problems.

  3. #3
    Super Moderator Need more power 670cc's Avatar
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    Probably can be bored at least from 670cc to 745cc, since Honda did it. The power increase is almost insignificant, though.

    I’d think having enough suspension and a decent passenger seat are going to be your first problems.
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    From NC owner manual:

    Need more power-warning-label-jpg

  5. #5
    Senior Member Need more power
    Need more power
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    [Probably can be bored at least from 670cc to 745cc, since Honda did it.]

    My guess is that a larger size liner was used for the 750 because they'd still want adequate wall thickness for strength. This also allows thickness for reboring in the future where a 670 bored to 745 will probably be at the limit.

    Honestly, I don't think anyone rebores a modern, street bike engine any more....much more practical to buy a bike with a fresh engine or one with more power!
    Last edited by DirtFlier; 29th November 2017 at 03:58.

  6. #6
    Senior Member mtiberio's Avatar
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    I take my son for rides, I'm 185# and he is heavier. I never wish for more power. I do however use sport mode. There it is perfect.

  7. #7
    Super Moderator Need more power 670cc's Avatar
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    Quote Originally Posted by DirtFlier View Post
    [Probably can be bored at least from 670cc to 745cc, since Honda did it.]

    My guess is that a larger size liner was used for the 750 because they'd still want adequate wall thickness for strength. This also allows thickness for reboring in the future where a 670 bored to 745 will probably be at the limit.

    Honestly, I don't think anyone rebores a modern, street bike engine any more....much more practical to buy a bike with a fresh engine or one with more power!
    Agreed. I was throwing that out more to show that the small power increase of the 750 over the 700 from a 75cc gain was not worth the trouble, even if it could be bored.

    You could do all the boring and pipes and programming chips you want, but in my opinion you simply need a different bike if the one you had was inadequate. Don’t waste your time, unless you’re just “bored”.
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  8. #8
    Senior Member HarveyM's Avatar
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    Quote Originally Posted by rjarrell View Post
    Wy wife wants to ride on back and she is heavy. I'm going to need more power. Anyone know how large the NC 700 motor can be bored out to.
    Don't worry, once she's tried it (on the NC), she'll never want to do it again....

  9. #9
    Senior Member Griff's Avatar
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    In all honesty and I am not being smart here, if more power is required for two up travel or the like, then the cleanest and least troublesome option is to change the bike for a more powerful one. I now have the 750 motor in my X-Adv and to be honest (as is suggested above) the gain over the 670 motor is marginal if at all. That was the impression I also had when I rode the NC750X back to back with the NC700X. At the time I also recall preferring the responsiveness of the smaller motor.

    Imho for effective passing power and the ability to haul two folks with luggage, then one needs to look more at the 1000cc + machines. Sure some folks will say the NC is good for them but to be honest for fast two up travel especially on Motorways or the like, the NC is not strong enough. The minimal pillion saddle also makes it clear that the bike wasn't designed with long distance two up travel in mind.
    It's never too late to have a happy childhood.

  10. #10
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    Quote Originally Posted by rjarrell View Post
    Wy wife wants to ride on back and she is heavy. I'm going to need more power.
    Adding Mass (weight) lowers acceleration: A = F/M. The force that an engine produces is Torque. The transmission and final chain drive multiplies torque by decreasing decreasing RPM's of the engine. (works the same way as levers and pullies ) Adding teeth to the rear sprocket will change the overall drive ratio and help maintain acceleration.

    Power, as in HP or Watts are scalar quantities and are the ability to do work, not Forces. The work done by vehicle engines is moving the vehicle through a fluid (air). Therefore, to a first order approximation, Torque determines acceleration and HP top speed. Getting anything more than an increase i decibel output from the NC engine is harder and more expensive than it's worth.

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