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[Kaneda]

Hi, I need help describing a intermittent issue I am having with my new Zero SR/F 2020.
 The last week of July, the issue began. Upon acceleration a mitigation of torque occurs, a bumpy sensation. The bike hesitates and fails to accelerate and can leave you in a really bad spot on left turns in traffic.

Initially I thought it was the belt. I took the bike in at 700 miles for service and a new belt. I told the dealer The issue I was having, we both agreed it must be the belt. The issue subsided for a while, Now it’s back. At this point there is little consistency With what I say that has much certainty. All I’m trying to do is narrow the issue down so that the dealer can actually contact Zero for assistance.
What little I know:
-It only occurs under load, I was able to lift the back end up and set the cruise control on- no issues
-I’m getting closer to thinking it may be temp related. The ride to work I usually fine. The ride home after sitting in sun is the scary one.
-it seems most notable in the 0-15mph range, as the motor struggles, sometimes not able to get over 10mph in 20 yards. After 15 mph, acceleration is more pronounced, but a mutter still is audible from belt motor area.

I’m not sure the the motor is set up, but one way of describing this might be a motor that is missing power.

So, has anyone else had this issue?
How do I begin to describe this, is there any more tests I can take to help narrow this down?
I have a video that is a little help in describing the sound and sensation, but even at 4 secs too big for the forum.

[Crissa]

That's a weird one!

I'd wonder if it wasn't a connector to the motor controller...  (Since it's more pronounced when it changes temperature.) Or in the motor controller.

-Crissa

[Shadow]

Does your local dealer have any experience with troubleshooting Zero Motorcycles vehicles? Do you have another dealer you can try taking the bike too?

Could be... brake calipers not floating correctly so they don't release?  Motor controller not commissioned or permanent magnets in motor have worn-in and do not match the settings? User error (not necessarily rider error might be some dealer induced assembly issue)?

There would be visible wear on the belt if it were a problem.

[Kaneda]

Thank you both for the response. Do either of you know anything about the bad boards in the 2019 SR/F? I remember hearing about that, or was it bad cables to boards?

I left work very late and had no issues with the bike.

I would be more inclined to think some of the IC chips on the board, or the board that controls throttle or power has a issue. It’s not brakes being grabby.
As far as a local dealer, no, they sell So few zeros I doubt that they have much experience poking at them. I’m 230 miles from the dealer I bought from. The closest dealer is 142 miles. Both dealers are on the coast, where the air is cooler and the issue will likely not present itself.
IF it’s temp related, which is still a question, so far the times it occurs are above 82 sitting in sunlight. If it’s in the shade or early morning or later in evening, it seems to subside.

[Richard230]

I had a somewhat similar issue (but not exactly the same) with my 2012 Zero. The problem turned out to be a defective throttle assembly. When that was replaced, I never had another problem with stalling.

[stevenh]

Can you dump the logs and email them right to Zero (and yourself)?  You may see throttle faults if that's the issue.

Steve

[Crissa]

Do the logs carry the throttle input levels?

-Crissa

[Auriga]

The SR/F logs do not contain throttle values, but would log any errors/messages recorded in the system.

I do not think the community can decode FST platform logs, so I'm not sure he'd be able to read them.

I'd email them to Zero and/or your dealer with a specific timestamp of when the issue occurred. I'm assuming no dash errors appeared, but if they did that'd be helpful too.
I'd say something like you found your acceleration limited under certain conditions, for example on the ride at 12PM on the 10th. That's enough to start looking

Did you get your motor commissioned in your 600 mile service? This sounds like it could be a motor/encoder synchronization issue. It's also normal to experience limited acceleration when at lower SOCs or when approaching thermal limits of the battery/motor/controller. Either of these sound plausible based on your comment that it only happens under load and after sitting in the sun for a while.

Either of these things should be visible in the logs, if you don't hear back from HQ in a couple days you can call them. They're not open on weekends though.

[Kaneda]

I had service done last month at 700 miles. I tried my best to describe the issue, Asked them
To check the log for any errors. No errors, the tech test rode it, every thing appeared at the time to be the belt which had a small bulge from a rock or something.

Zero will not communicate with me on this issue, they cut me off mid sentence and told me to contact a dealer twice during my call. Again I just trying to find the right conditions and language that will assist the dealer in a solution. Otherwise it will just sit around for months outside at the dealership. Should I try calling again?

I have not had the bike much under 30% SOC.
The only thermal limits I am aware of is what is on the display, nothing ever out of range. On the hottest day I rode it was 107 outside. I Am gravitating toward the issue being temperature related, but need more testing.

[stevenh]

This parser partially works with SR/F logs anyway. 

https://zero-motorcycle-community.github.io/browser-parse/zero-log-parser.html

It might be interesting to look at your MBB and BMS logs using this tool and search for any errors.

Steve

[Auriga]

I don't mind looking at them if you want to post the unparsed logs, and the time one of these events occurred.

That doesn't sound like Zero's typical response, but any issues related to the drivetrain they could be hesitant to make recommendations without it being worked on by a dealer. You could try again, asking if they see any errors in your logs at x time. Maybe you got unlucky, I have heard of them doing this before. Not surprised if they still send you to a dealer, but if they do you could ask why they think you should go.

[Kaneda]

I don’t know the first thing about posting a log. I have a very specific to
E frame today 1:43-1:50 that was so bad I thought I’d be walking. I also noticed ‘bumpiness’ while deceleration.

In the meantime I will email both parties (dealer and Zero)

I am also dropping the heat hypothesis today as it was 70-72 outside.

[Crissa]

This seems like a real unique problem.

-Crissa

[Kaneda]

I agree. I can’t find anything anywhere that sounds like what I’m going through. The closedown to it was a SR with a bad throttle. I promise I’ll post the resolve when I get there no matter how embarrassing or simple it may be.

[Kaneda]

Small change, the issue became more prominent. This feels a lot like a bearing Issue that is loaded wrong / or now has a flat spot. The hesitation is the initial bind when accelerating from a stop. The bumpy sensation is likely the wheel or motor bucking. Goes away around 10mph. No noise yet-

Any other way I can test this further?

Was also told by dealer that there is no one at Zero factory right now, everyone is working from home, and the fires were about five miles away and they chose or needed to evacuate. Basically they are not responsive right now.