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Thread: big bore/stroker kit?

  1. #11
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    I'm looking at options right now, not dead set, and I couldnt care less what the bike was designed to do, I mod my vehicles to suit my taste.

    -Jesse

  2. #12
    Senior Member duk2n's Avatar
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    Anyone has seen the crankcase design of the NC engine? I doubt a bigger bore is possible...
    -JL-

    Maņo a mucha honra

  3. #13
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    Quote Originally Posted by jesse096 View Post
    It's fuel injected, shouldn't be that hard if I can find someone witha laptop and tuning software, or use a power commander.

    -Jesse
    Tuning has been done................see other posts..............little or no gains and expensive>

  4. #14
    Senior Member buckshot's Avatar
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    JE pistons will make custom forged pistons for any application, they even have downloadable drawings for the purchaser to fill in measurements. But that would require measuring a stock piston, then knowing how much wiggle room in what areas you've got to play with.

  5. #15
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    Jessie.

    It is fuel injected, but it has no MAF sensor and its already near as damn it at stoichometric maximum. If you bored/stroked it its just run so rich it'd choke. Add in that the 270 degree firing order is damped to exactly the piston size and its almost as though its a bike specifically designed not to be tuned.

    Sorry chap. Tuning is good fun, but without a active MAF and a much more complex ECU there's pretty much no where to go with this bike.

  6. #16
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    Quote Originally Posted by duk2n View Post
    Anyone has seen the crankcase design of the NC engine? I doubt a bigger bore is possible...
    Stroke... I can see the crankcase being a serious limiting factor unless it's not strong enough to handle the power. Same thing for the crank and both are probably over designed for strength to increase life.
    Bore... the piston doesn't travel past metal surfaces of the cylinder wall so it's more a matter of how thick the cylinder wall is.

    After that consider you are splitting any increase in cc over 2 cylinders so a 50cc increase is 25cc per cylinder.
    As pistons get larger or the stroke gets longer it requires a smaller amount of change in bore to get a given cc increase.
    In a long stroke motor like the NC's, adding 50cc would require less overbore than in say the Versis.

    If I knew the bore and stroke I could calculate the required change... and we know that.
    Bore/stroke = 73 mm × 80 mm

    So:
    ((80 * pi) * ((73/2)^2)) * 2 /1000 = 669.662cc or 670 when rounded.
    A bore increase of:
    1mm adds 18cc
    2mm adds 36cc.
    3mm adds 56cc and gives you 726cc.
    A 50cc increase would probably require sleeves but where the limit is for boring without adding sleeves is anyone's guess.
    I'd guess at least 1.5mm would be possible giving you about 700cc displacement.

    I know a big bore kit for the VFR800 offered a 4mm overbore.
    That would allow 765cc on the NC if it's possible.

  7. #17
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    This bore thing has been hashed and rehashed in many different Honda bikes.........like the Transalp that went from 600 to 650 then to 700cc, the NT650 that went to 700. Many times this is an advertising and what the competition is doing in engine sizing and is not a power or engineering issue. The engine sizing can also be a local regulatory engine size issue. This was true with the US with tariff bikes when 600-700 and 750 were break points in imports.

    The NC700 to NC750 change is likely to separate it from the 500 and not some huge power increase. This too has been hashed else where

    The Transalp guys also went through this by installing the NT650 motor in a 600 Transalp. No real gains and a fair amount of work. I had both bikes and roll 40 to 70MPH were almost identical.
    NT650 did have many more mods available to increase power but the trade off was lower in power, the NT mods were more for track use which was the opposite of the Transalp typical use.
    Last edited by showkey; 8th October 2013 at 13:43.

  8. #18
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    Quote Originally Posted by n30r3l0ad3d View Post
    ...If anything the bigger pistons would be more economical, working less to get to a desired speed.
    Then put a Gold Wing motor in it and get triple the mileage. It won't even know that there is a motorcycle attached to it.

  9. #19
    Senior Member n30r3l0ad3d's Avatar
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    Quote Originally Posted by Beemerphile View Post
    Then put a Gold Wing motor in it and get triple the mileage. It won't even know that there is a motorcycle attached to it.
    You know, that's a really great idea
    2013 Honda NC700X
    1974 Honda CB750K

    Youtube Channel: http://www.youtube.com/user/n30r3l0ad3d/

  10. #20
    Senior Member Gigs's Avatar
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    Quote Originally Posted by Old Can Ride View Post
    I agree with Beemerphile, why! Not the purpose of this bike. But folks do spend thousands for just 1 more knot on a boat. So, why not!
    Thousands is an understatement, I read during the Americas Cup (big sailing race) that you can show up without spending 100,000,000 smackers. Those sail boats are insane. Last I checked in F1 to shave a second off your lap time cost a million dollars. The only limit to the amount you can spend in the chase for speed is your bank account.


    Gigs

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