Hello folks!

This is kind of hard to explain, but I'm going to try anyway. I have the Mirage 1.0 72 hk manual European version. I'm not sure of the specs other than that. I have a long hill down from my work, and to keep 70 km/h I put it in third and just coast down the hill. When doing that I get a wierd cycle of ~10 seconds of coasting and ~10 seconds of something that feels like a slight break (but from the engine if you know what I mean). Then it goes back and forth like that.

Sometimes I can also feel it while driving flat out up the hill. The engine kind of gives full power, then a slight dip in power, then full power and so on.

What can this be?