I have a '17 I bought late in the year and was only able to put 1k miles on it due to my work schedule. The engine is quite noisy especially the left cyl.. Sounds like valve train noise and if the left cyl. was the same as the right cyl. I could probably live with it. Plus the left cyl. exhaust pipe is bluing more which tells me that cyl. is also running leaner. So it's time to pull the covers and check everything out. I'm hoping it's just a max valve clearance issue and not any valves out of spec.. Actually I'll going to order an aftermarket shim kit so I'll be ready if any valves need adjustment to min. specs.. Any recommendations on what feeler gauges, spark plug tool, shims etc. I'll need to do this? Also what are my best non dealer options to richen up my engine?