How to replace Kalkhoff Impulse motor

[4bound]

The impulse motor on my Kalkhoff has finally given up - it now has short periods when the pedals turn but there is no drive to the wheels. This can only get worse so it seems I need a new motor.

It so happens that we have another, but rarely used Kalhoff, also with an impulse motor, in the house. So my plan is to use the motor from this second bike to bring the first one back to life.

The question is how? I know lots of people have had problems with this motor over the years, so am wondering if anyone has a guide or indeed just some tips, on how to go about it?

 

[flecc]

There were some changes in the Impulse units over time, so best change the motor unit and handlebar unit as a pair to avoid any incompatibilities.

I can't give any other specific advice since I've never changed one.
.

 

[AndyBike]

or indeed just some tips

Yeah, chuck it in one. Go buy something with BOSCH written on the side

 

[4bound]

Yeah, chuck it in one. Go buy something with BOSCH written on the side

Well - its done 4000 miles for me and I have the second motor in my shed at no extra cost. But you think I would be better spending another 3K+ right now? I think its worth a try to get it running again.

 

[4bound]

There were some changes in the Impulse units over time, so best change the motor unit and handlebar unit as a pair to avoid any incompatibilities.

I can't give any other specific advice since I've never changed one.
.

Hmm, - the broken one is an s-pedelec whereas the new one isn't, so I was hoping to leave the control system unchanged. The units look identical from the outside!

 

[flecc]

Hmm, - the broken one is an s-pedelec whereas the new one isn't, so I was hoping to leave the control system unchanged. The units look identical from the outside!

Ah, not the same model. Well you can only try, you may be lucky with the two compatible enough to work, but I very much doubt it will perform as an S pedelec.

The Panasonic units the Kalkhoffs used initially all looked identical outside, but their circuit boards had various differences internally, according to the bike maker's requirements.
.

 

[soundwave]

peter might be able to fix it.

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