NC700x Vibration at 4000 rpm 'ish

[SimonF59]

Does anyone else experience an engine vibration at 4000 rpm, when in top gear it is around 70 to 75 mph.

 

[Midnight Rider]

Yep, I do. For me it's between 71.5 to 75. Let's me know how fast I am going with out looking at the speedo.

 

[BerndM]

There's some vibration at any speed or RPM because of the crank design.
Not my favorite feature by far.
I'd much prefer it to run smooth as a sewing machine.

 

[Deleted member 1183]

I would describe it as more of a roughness than a vibration. Obviously this is also why a second balance shaft is incorporated into the 750. I find that it is most pronounced under heavy load but if the throttle is backed off a little under steady cruising it is not so noticeable.

 

[BerndM]

Somewhere, a while back in this forum, there was a discussion about the NC's engine characteristics, and IIRC, the gist of it was that Honda purposely used a 270 degree offset crank to give the otherwise silky smooth engine, a more aggressive feel, like a larger displacement vee twin.
The 270 crank also allows much lower rpm shifting by lowering the torque curve to a useable level even at 2000 rpm.
This is how we manage to get almost 60-70 mpg while at lower rpm than most bikes.

 

[TCRider]

I enjoy it just the way it is.

 

[itlives]

I was one of my "gripes" when I first got the NC. I like it now. There's nothing wrong with it.
My Tenere (twice the engine) also has the 270 degree firing engine. Strangely, it is very smooth at 4K rpm's but has a good rumble/lope at idle.

 

[Ertie]

I have a 2015 NC750X, even though it has the second balance shaft, I still feel the vibration around 3000- 4000 rpm, if you turn the throttle. If you are cruising at constant speed there is no vibration.

 

[kumatae]

I just found this post but yes, I feel a slight vibration at 4000RPM on the dot regardless which gear I am in. Doesn't really bother me now. I feel like it's the sweet spot to change gear anyways.

 

[jimmy da vig]

It's weird to read this. I have the 750XD and can feel the power strokes from starting at 1100 under acceleration up to around 4,000 then it smooths out completely. Under a hard load you might feel it a little bit more. Comfort zone, 70-75 mph.

The bikes power curve and smooth zone remind me of my long gone R100RT. The faster you go the smoother it gets. I like that.

 

[SilverRocket]

My 2016 has that vibration that starts at about that same rpm.
In 6th gear it starts at exactly 71 mph. At 70 it's pretty smooth but as soon as I hit 71 the vibration starts, in both the grips and the footpegs.
It also starts in each lower gear, but since I'm usually accelerating through traffic I don't risk looking down and trying to see what rpm the silly bar graph gauge is at.
I have gone into manual to see if it does it at the same rpms and yes, it does, I just can't remember the speed in 5th, 4th, or whatever.

 

[frog13]

Have to agree with Jimmy da. My 700x smoothes out the further up the RPM scale I go. And yes , in any gear.

 

[Taipan]

I just picked up a 700x and new bike nerves had me googling the 4k vibration, hoping to find such a thread. Phew!

 

[halfmt1]

It's weird to read this. I have the 750XD and can feel the power strokes from starting at 1100 under acceleration up to around 4,000 then it smooths out completely. Under a hard load you might feel it a little bit more. Comfort zone, 70-75 mph.

The bikes power curve and smooth zone remind me of my long gone R100RT. The faster you go the smoother it gets. I like that.

I have a 2018 DCT and have had the same results, I find myself speeding alot of the time because it gets so smooth.

 

[SilverRocket]

Do your vibes start at a specific speed, like mine do (see post #11)?
At 71 mph I'm already speeding, so don't really know if it would smooth out if I went 90+. I'll have to check someday, if I ever come across a deserted freeway.

 

[Jt105]

Do your vibes start at a specific speed, like mine do (see post #11)?
At 71 mph I'm already speeding, so don't really know if it would smooth out if I went 90+. I'll have to check someday, if I ever come across a deserted freeway.

Downshift. You can run higher RPM at a lower speed without worry of speeding.

JT

 

[Gigs]

My '12 has 65,000 miles on it and it has always done that. No damage, just a characteristic of the engine.

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