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Eric
Guest
I have an '08 ZZR600 and the engine sounds rough. It lacks the "whine" that it had when I was brand new. There is also an intermittent "rubbing" sound in the engine as well. I have only 1700 miles on it and have had it cheked by a factory certified, working tech friend of mine look at it and says all is fine. It was rejetted at the dealer for altitude and I put on a jardine slip on muffler. I had it serviced at 500 miles, and only use 91 or 93 octane in it, and ocassionally 111 race fuel. Any suggestions on what to check or what might be wrong, if anything?