Picked up a used 2009 ZX14 a few months ago with about 3600 miles on it and it's a dream. About 3k miles later I have had no problems yet with the bike. A couple things that concern me though:
- lots of tapping when the engine runs at low-mid RPMs. From what I've read, this is normal...?
- low gas mileage. I don't have a long history of gas mileage. Since I started tracking tanks over the last month or so, I have 2 tanks on road trips where I got right at 34 mpg on both tanks. My normal commuting/fun riding miles varies from 27-30 over 5 tanks. I generally ride pretty moderately, with some "spirited" riding. No drag racing or stuff like that. The bike also seems slower to me than it was, but I'm thinking it could just be me getting faster...
I guess my main question is really is this a problem worth taking the bike to the mechanic and paying him a lot of money to investigate? Or is this just a normal thing?