Boardman adv8.9 FAZUA clunk on gear chAnge

[Wootty22]

Hi all, new here. I tried the search but no real hits for this topic. When I change up a gear on my boardman the motor unit FAZUA makes a clunk if I’m still turning the pedals. Is this normal? If I don’t turn the pedals the drive doesn’t do it. Is this normal for this type of drive ??

 

[sodoff]

Surely, it's just the derailleur doing the clunking? Why do you think it's the motor unit? If you don't turn the pedals, no clunk you say. Do you change gear whilst freewheeling?
Sorry for what might seem an unhelpful response, but I'm fascinated to understand what's happening!

 

[rayray]

I have no experience with Fazua, but I have two other mid-drives. When changing gears, they require a very brief pause in pedaling, to avoid the “clunk”. Continuing to apply torque to the pedals can potentially cause damage to the drive train. I’m not certain, but I’ll bet the Fazua owner’s manual provides the same caution.

It takes some time getting accustomed to pausing while shifting, but it’ll become second nature.

 

[Wootty22]

Surely, it's just the derailleur doing the clunking? Why do you think it's the motor unit? If you don't turn the pedals, no clunk you say. Do you change gear whilst freewheeling?
Sorry for what might seem an unhelpful response, but I'm fascinated to understand what's happening!

As described in the other reply, it’s more a case of stop apply pedal load while shifting. Keep turning the crank slowly obviously to get the derailleur to shift.

I’ll try the pause in pedal load while shifting to see if that make a difference. Iv’e also aligned the rear shifter better.

 

[rayray]

Yeah, reducing the load is the answer, but I find that’s often difficult to do without a slight pause. Perhaps you’ll do better than I.

 

[Wootty22]

Yeah, reducing the load is the answer, but I find that’s often difficult to do without a slight pause. Perhaps you’ll do better than I.

 

[Flannel Guy]

As described in the other reply, it’s more a case of stop apply pedal load while shifting. Keep turning the crank slowly obviously to get the derailleur to shift.

I’ll try the pause in pedal load while shifting to see if that make a difference. Iv’e also aligned the rear shifter better.

With my bafang Ultra, the slight delay in motor cutoff when you stop pedalling is enough to change the gear. I developed a habit to stop pedalling when my left foot is in the down position like stepping on a clutch in a car to shift.