I have a 2017 ruckus with about 16k on it. In the past 6 months, I have it worked on at the honda shop. I've had 4 valve adjustments. It's always exhaust tightening and he has already went down to the smallest shim and had me replace the valve. 2 adjustments ago. after less than 100 miles it won't start again. He advised me that the valve will need replacing as it already had the smallest shim in there. I asked if there was a way to fix the root cause as this clearly isn't normal valve wear. Maybe a camshaft? He said it has a lot of miles on it. It's probably just worn out. Is there an issue like the cam shaft I should be considering? Should I take to another shop? Thanks for your input guys.