Hi everyone, i own a 2001 Cagiva Navigator, but ever since i bought it, it has a typical problem. In the lower revs, it feels like one cylinder sometimes quits working and then comes back to life again. This results in coughing, and a non-smooth ride. It is recently synchronised after which things got better, but still far from perfect. Above, say, 3500 revs, problems are over. This problem is double as bad when the engine is cold. Besides, at a cold start, the cold-start-handle on the engine is moving, but does not have any effect (no higher revs). New spark-plugs didn´t help a bit, by the way, and the colour is coffee-brown, also ok. Anyone ever encountered this problem? Or any idea what it can be? Thanks for the info! 
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