Intermittent problem

[Artie]

I have an ebike with a 1500 W mid-drive Bafang motor and controller. The assist mode will frequently cut out and the only way I can get it running again is to repeatedly pump the thumb throttle button. But even then, it doesn't last for long and I have to do it again. The bike isa Velotrix and is about 4 years old with only about 100 miles on it, so it's out of warranty. Has anyone else had this problem with the Bafang mid-drive?

 

[slitespd]

I have an ebike with a 1500 W mid-drive Bafang motor and controller. The assist mode will frequently cut out and the only way I can get it running again is to repeatedly pump the thumb throttle button. But even then, it doesn't last for long and I have to do it again. The bike isa Velotrix and is about 4 years old with only about 100 miles on it, so it's out of warranty. Has anyone else had this problem with the Bafang mid-drive?

Does the bike have brake lever motor cut off? If so, could a brake lever be sticking a bit and the aggressive throttle closes the contact again?

 

[Gionnirocket]

25 miles a year... Man you're tearing it up!

As stated I'd check the brake cut outs. They're not necessary for the bike to work so you can try unplugging them near the levers.
Also check the speed sensor magnet
Then I'd go over all the connectors... intermittent many times means a loose/poor connection. Maybe one is fouled with a little oxidation and you can use some contact cleaner
Do you get any errors on the display?

 

[Chargeride]

Are you pumping the throttle with no response from the drive?

 

[PCeBiker]

I'm thinking perhaps a bad cadence sensor?

If your ebike responds to the throttle (perhaps without the pumping) then it may be a slipping or binding cadence sensor?

Does everything work properly when just using the throttle?
(There's a time delay for throttle response)

You might just have a slipping/binding/dirty cadence sensor?

As far as I understand it, the throttle overrides the cadence sensor, But the throttle has a computerized time delay.
(I hate computer control)

Try holding the throttle full and see what happens.



If your ebike runs normally under throttle control (keeping the time delay in mind) then it's probably a bad cadence sensor or it's connection.

 

[PCeBiker]

25 miles a year... Man you're tearing it up!

I felt bad about procrastinating until summer to go for my first ride.

I put 200 km on my ebike in the last week.

 

[Gionnirocket]

Rereading this... I think Artie is a little confused.
4 years ago, Bafang didn't offer a 1500w mid drive and for sure it wasn't on a Velotrix? / Velotric?
4 years ago the M620 was 1000w and now the M630 is 1500w.... though mod controller/motors from Innotrace were available at 1500w and above.