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I would say about 1500 miles.

I have oiled the chain recently, but the grainy feel is not present when the power is off, which makes me think it's related to the motor.

Along the flat it's very smooth but when going up hill, particularly a steep hill, there is a definite rough 'grainy' feel from the cranks. It is not accompanied by a horrible noise - just the normal noise but louder and more noticeable since the motor is working harder. I'm not sure when it...

Thanks to all. It wasn't any of the threads which shemozzle referenced, but I will tighten the bolts as per flecc's image - looks like I will need a crank puller and some circlip pliers. I will do this and report back as to whether this cooks the goose..

I have a clacking sound from the crank/chain area but might be from the rear hub. It sounds exactly like that described on a thread here, which I was reading a while ago, which turned out to be the motor mounting bolts..there was talk of loosening the bolts then jiggling and retightening..but I...

As an update, I emailed Kalkhoff and they said that the learning cycle is still required and that the omission in later manuals was due to language and translation issues (?). So I finally decided to do a learning cycle since the weather is somewhat milder now. The result was that the new...

Thanks flecc and John. I asked 50cycles and they said run it down every six months. I am still unsure as to the reason for this advice being missing from the impulse 2 instructions. The batteries might be different as per this page so I was thinking that this might be the reason. The problem...

Many thanks for your reply flecc. I have appreciated your informative posts on here for a while. Thanks also for giving the right answer! I had to run the old battery to empty a couple of times, by request of 50cycles, while we were trying to find out what was happening with it, and for the last...

Hello experts! I have a Kalkhoff agattu 2013 model and the battery was recently replaced under warranty. Under the instructions for impulse 1 bikes (the one I have), the battery should have a 'learning cycle' where it is run down to empty for the first cycle. However under the instructions...