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I have fitted the new hall sensor and reassembled - hoping for improvement but still the same. However I have tried the bike without the tensioning gear on so there is no chain on the chain drive sprocket and it turns when pressure is put on the pedals. This appears to point to the clutch...

Sk11 here and 6 of us with varying kalkhoff bikes

I will update when I have tried the Hall sensor after it arrives Thanks for all your help and comments so far

And when riding bike the same whirring but no apparent assistance

Yes exactly that

How to access the rollers Do I need to remove the bearing on the shaft though the nylon gear.

How to check if clutch is slipping under load?

Flecc even

Yes I would think it was one of those also or was hoping it would be something visual like that Flex is sending me a hall sensor board to try out

Have inspected the nylon gear an no obvious damage Turning the nylon wheel turns the motor pinion

Definitely whirrs

Have sent a message to you thanks

Get between 0.1 to 0.2 ohms

Hall sensor seems to be in place on the locating spigots Any more ideas from anyone

Can anything be done with the clutch if it is faulty

Did not appear to slip before. Sometimes had to turn it off and on again to get assistance but sometimes that at bottom of a hill and not turned on early enough When turning the drive pinion it turns clockwise and turns the motor Turning anticlickwse it just turns the drive pinion

Went on a run a few weeks ago and at the end of run freewheeling down a hill onto a farm track - on the track it appeared to have list assistance Meant to look at it but didn't before I needed it the week after when I have had the symptoms of motor noise/whirring when pressure on pedals but no...

I have stripped and opened the motor carefully but there is nothing jumping out at me as a source of the problem Does anyone have any suggestions

We carry 2 kalkhoff bikes on the back of a motorhome using a tow bar carrier from thule

I delve any deeper it should have said