I have an '03 954 with about 18,000 km's. Always over maintained and pampered, but ridden moderately hard. 99% sport riding/touring, a couple of track days. Frequent oil changes. Last year detected some infrequent knocking from the engine, usually at idle, going away with increased rpm. This year, knocking is more frequent and only occasionally do I not hear it. Has anyone else on the forum experienced this? I've spoken with another 954 owner who has the same problem. Honda says "we haven't heard anything like this". Any help appreciated.