I´m looking for some technical advice on the AN400. We have a bike which is having starting problems which we believe may be related to the auto-decompressor mounted on the camshaft. Even with a new battery and starter motor, the bike is reluctant to turn over esp when cold (the symptoms seem similar to that of an engine "hydraulic-ing"). We have examined the cam and the mechanism for the decompressor appears to be ok, but we suspect the spring tension on the mechanism is weak. We have heard from another source that this is a known problem - has anyone had any experience of this? Thanks!