i own a 2001 929 and it has almost 20k miles on it. it just recently started to make a weird noise. sounds like it might be the drive shaft. im using moble 1 10w 40 full synthetic 4 stroke motorcycle racing oil. it also has -1+2 520 conversion on it. just wanted to know is this a potential major problem or could it just be the oil? any info would be great. thanx.