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[kensiko]

Hello,

I'm late to post this, but when I purchased my Zero last autumn, I quickly discovered that I had the feeling of not going at constant speed when keeping the throttle at the same position.

Has anyone noticed this on their Zero? It might also be a small issue with my throttle pot or it's just too sensible so that any slight movement of my hand will change the speed.

It's not a big issue it's just a concern.

[Richard230]

I haven't noticed that with my 2014 S.  However, many IC motorcycles with fuel injection systems do tend to "hunt" (due to lean fueling) while trying to hold a steady speed.  But nothing like the old two-stroke motorcycles used to do.     I loved a two stroke engine under acceleration, but hated them when you backed off the throttle and tried to run a steady speed that did not place the engine under a load.

So, I guess what I am saying is that all of the electric motorcycles that I have owned have provide a much smoother and steady throttle application than I am used to since IC emission regulations hit the scene. 

[spelunker]

I've had my 2013 S for about a year. I got it new and just turned over 14,000 miles on it on the way to work this morning.  I too, have noticed this phenomenon.  It's oddly comforting to know it's not just me!  For me, I'm not overly concerned about it.  My bike is on the recall list, so I hope having my firmware updated takes care of it.  My bike has never quit running, so it's just kind of a nuisance.

[oobflyer]

Is the speedometer fluctuating?
I haven't noticed this on my 2012 ZF9.

The speedometer runs a bit 'slow' however. When my speedometer reads 75 MPH, my GPS says I'm going 70 MPH.

[BrianTRice@gmail.com]

The speedometer runs a bit 'slow' however. When my speedometer reads 75 MPH, my GPS says I'm going 70 MPH.

Motorcycle speedometers traditionally have a built in inaccuracy, to appear to discourage motorcyclists from speeding.

http://www.popularmechanics.com/cars/how-to/4260708

[LiveandLetDrive]

Was this flat ground with no wind, etc?  I'm constantly adjusting the throttle by minute degrees whether it be gas or electric just responding to the road and wind.  Nothing drastic but there's a reason cruise-control in cars doesn't just lock the pedal in place.


Agreed my speedo is optimistic, even worse now that I've gone to a smaller rear tire.

[Richard230]

My 2012 S had a speedometer that was about 8% fast.  (A cheap way to increase the bike's speed.)  However, my 2014 S has a speedometer that seems to be right on the money.  I do appreciate accuracy.   

[Burton]

The speedometer runs a bit 'slow' however. When my speedometer reads 75 MPH, my GPS says I'm going 70 MPH.

Motorcycle speedometers traditionally have a built in inaccuracy, to appear to discourage motorcyclists from speeding.

http://www.popularmechanics.com/cars/how-to/4260708

I was told all foreign cars and bikes sold in the US have inaccuracies because they get fined if they are over the speed indicated. Most, from what I recall, put in a 5% inaccuracy. For me this means at 80mph indicated I am really going 75.

[WindRider]

In regards to speed stability on Zero Motorcycles, I rode a 2012 Zero DS last season and after about 6K miles I started to experience this.   There was a recall for controller firmware and I mentioned the speed control stability issues to the tech.   After the firmware upgrades he checked out all of the servo performance with the motor and said that there was some encoder drift.   He calibrated the encoder after the upgrades.

After that the speed control instability was completely gone.   Throttle response was perfect and very stable.   Something to check with your dealer if you have that option.   

[Le Z Turbo]

I sometimes feel this instability also, on my 2013 DS and mainly at low throttle positions. No possibility of reprogramming anything at my dealer here in France, he has no programming tools !!!
Laurent

[benswing]

My 2012 Zero S ZF9 is rock solid in terms of speed.  Power output is completely consistent.

[NoiseBoy]

My 2012 Zero S ZF9 is rock solid in terms of speed.  Power output is completely consistent.

+1 its very refreshing after riding an ICE.

[dkw12002]

I notice this on a fully charged battery only.

[Justin Andrews]

My 2012 Zero S ZF9 is rock solid in terms of speed.  Power output is completely consistent.

Agreed, the only time my own Zero S ZF9 started to get sluggish and refused to accelerate past 50mph was when I had gone deeply into the reserve after the last bar had dissapeared.

[kensiko]

In regards to speed stability on Zero Motorcycles, I rode a 2012 Zero DS last season and after about 6K miles I started to experience this.   There was a recall for controller firmware and I mentioned the speed control stability issues to the tech.   After the firmware upgrades he checked out all of the servo performance with the motor and said that there was some encoder drift.   He calibrated the encoder after the upgrades.

After that the speed control instability was completely gone.   Throttle response was perfect and very stable.   Something to check with your dealer if you have that option.

Thanks for the input, I will check with them. I just hope they won't keep it for weeks.