jesse096
New Member
I have a plan for my nc700 that might involve using a big bore/stroker kit. Is there a manufacturer that produces a kit for the nc700x?
-Jesse
-Jesse
big bore/stroker kit?
- Thread starter jesse096
- Start date
Honda may have one in the near future. You may be able to take it up to 750cc.
(don't forget the turbo and a 4 foot swingarm)
D
Deleted member 1183
There are two kits available, stage 1 and stage 2.
Stage 1 is a Crossrunner and Stage 2 is a Crosstourer
Stage 1 is a Crossrunner and Stage 2 is a Crosstourer
bigjeff
Site Supporter
It is already a stroker. stroker = stroke is longer than bore is wide.
A good motorcyle racing machine shop can bore the cylinders to match a set of pistons. The pistons need to match the connecting rod and provide some squish area on the top too though.
The new NC750 pistons may work or the cross XXXs listed above. Got a good motorcycle speed shop in your area? They would need to do some measuring which of course means pulling the cylinders out and providing the potential piston candidates.
FWIW - I can't imaging why tho. Unless you have some huge bet to win?
If you want performance get a performance bike. This engine was designed for economy. You are battling the design.
But to answer your question - there is no kit.
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n30r3l0ad3d
New Member
I've wrote wiseco a few emails concerning bigger pistons for the NC, and said they are currently in development. You'll have to excuse some of the nay sayers, but yes it should be possible for a kit of some sort in the future I would think. The only thing I can think of that Honda did to gain a few cc's on the new NC is bigger pistons. Bigger pistons and higher compression however would mean you would need to run premium, but the torque down low should be ungodly lol.
If anything the bigger pistons would be more economical, working less to get to a desired speed.
If anything the bigger pistons would be more economical, working less to get to a desired speed.
jesse096
New Member
I'm a big dude and could use the extra torque of a big bore, which is why I asked. I can't fit on a "sport bike" because of my knees and height. Its just too uncomfortable for me, which is why I got the NC.
Thanks to those who actually replied with an answer.
-Jesse
Thanks to those who actually replied with an answer.
-Jesse
showkey
Super Mods
But........the fuel mixture would have to be addressed after the big bore mod..........not easy or cheap task.
Old Can Ride
Active Member
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!
jesse096
New Member
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
-Jesse
jesse096
New Member
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
-Jesse
duk2n
Site Supporter
Anyone has seen the crankcase design of the NC engine? I doubt a bigger bore is possible...
showkey
Super Mods
Tuning has been done................see other posts..............little or no gains and expensive>
buckshot
New Member
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.
SlowSteve
New Member
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.
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.
JamesD
Member
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.
showkey
Super Mods
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.
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.
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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.
n30r3l0ad3d
New Member
Gigs
Active Member
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
