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Interesting. I did half suspect this (see my original post) but because it happened at various speeds above around 12mph (not just 15mph) then I thought maybe not. I’m wondering if the 15mph threshold varies with battery condition, load etc etc. In which case, that may be the answer. I would...

That's good advice. I'll be sure to check as you have advised. Many thanks!

I’ve just been out and waggled each cable/wire I could see and the bike is now performing to spec. My conclusion is that it took a hit of some sort during the 1.5 hour journey in the back of my car after purchase, even though I was very careful loading and unloading. Nothing was actually loose...

The Wisper is a 705 SE step-through in red with 26” wheels and was bought new November 2018. It doesn’t have front suspension and the battery is horizontal on the rear rack. It has 7 speed Shimano derailleur gears and rear hub motor. I bought it second hand on Thursday (4 days ago) but only...

I recently bought a red step-over Wisper 705SE. I just noticed that at around 12-13mph and above the power starts to come and go every few seconds (power drop for a fraction of a second then surge back to normal). I can feel it and I can see the power loss on the current display. At first I...