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It's possible that it's not a common problem with the Wisper and I was unlucky. It's also possible that other people don't recognise the problem and live with it.

I took the bike to the Wisper HQ in Sevenoaks and they have fitted a new motor. Both they and the dealer were surprised at the problem, so it's not usual.

I've emailed support@wisperbikes.com and asked to make a warranty claim.

The cable exits downwards. The clutch has stuck a couple more times now. The bike is still under warranty (just) so I think it best to sort it out through the dealer.

The hammer trick has worked again. I wonder if it sticking is partly a consequence of using the motor to its max, PAS setting 5 riding up 10% gradients on occasion.

It's stuck again. I'll give it another whack. If it keeps happening I'll open it up and take a look. It might be the sprag clutch like this

Sorry, it was sold quite some time ago.

Whacking the wheel with a rubber mallet has fixed it, for now at least. Thanks for the diagnosis and advice. Because my bike has a centre stand I didn't even need to turn it upside down.

Yes, the cable exits downwards and it has an axle end cover. I will try a lump hammer to unstick it but was wondering if it might stick again. If I take it to the dealer they might just do the same anyway, so may as well try it myself

Yes, the cable exits downwards and it has an axle end cover. I will try a lump hammer to unstick it but was wondering if it might stick again. If I take it to the dealer they might just do the same anyway, so may as well try it myself.

I'm going to contact the dealer tomorrow to discuss. It's definitely not right so should be dealt with under the warranty .

Presumably I will need to know what motor I have to be sure of a compatible clutch. I think Wisper used Aikema motors

Makes sense. I'll give it a go. If it doesn't work do you think a 36v MXUS XF08 motor would be a swap replacement, keeping the same controller, battery and display unit?

I got to the office this morning, switched off the power at the display unit and went to push my Wisper 705se to the secure bike shed, and there was noticeably increased drag and the feel of cogs turning as I pushed the bike. And now on its centre stand, rear wheel off the ground, when I use the...

If there are no brake cut outs on my Wisper 705 then that does make it easier to replace the hydraulic brakes with cable operated ones. Swings and roundabouts but I find it easier to work on cabled brakes.

Well, I bled the front brake again. It's a bit odd that the front brake gets this more than the rear. It might be related to pad wear and just needing a bit more fluid in the line. Hopefully won't be needing to invert the bike for some time to come. I only need to do it for rear tyre changes...

Wek Well, I seem to have an association between having the bike upside down and sponginess in the brakes, the front one in particular.

I now have 1050 Km on the clock. The larger 700WH battery means I can ride my 46 (ish) mile commute on the 4th of 5 power levels for the 3 hrs 30 mins it takes there and back. Average speed is 13 mph. Changing the freewheel from 14-28 to 13-28 is giving me more speed on descents where I can...

I find it hard to believe there's no power cut off on the brake levers. Maybe something has got disconnected?

Replacing the chain has fixed the vibration I was feeling through the cranks. I'm half wishing I'd bought a 40mm Marathon GG for the rear rather than re-use the 47mm GG I had. Even at 45psi the latter is not the most comfortable, though it should be more fairy resistant.