Back in February I got an '02 R1150RT-P ex-CHP bike from a guy in San Francisco for a paltry $2000. He mentioned to us that the dealer it was serviced at said the clutch was "soft." Riding it around, it feels great, but the one thing I noticed is that it makes a very prominent, deep knocking noise during deceleration. I have a feeling it's not in the engine, since changing the oil for heavy-duty Delo 400LE didn't make a difference. It also sounds like it's coming from much further back than the engine; listening today it sounds like it's coming from below the rear edge of the fuel filler cap. It also occurs during acceleration, but it's much more quieter and it almost unnoticeable. It's also worth mentioning the noise is RPM dependent, the faster the engine goes, the faster (and louder) the knock is.