I just bought my 04 R6 used not too long ago. Has 15000 miles on it. Got around to putting some plugs in it today. When I pulled the old plugs out the threads and bottom where covered in oil. Do these bike have valve seal or ring problems? How difficult is a valve seal replacement? How much would a dealer (In general) charge for forgiving rings? What about for fixing a valve seal? Thanks for the help and if you need more info just ask.
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