We bought a new leftover 2008 SYM HD200 about 2009 in Washington State. We moved to the Big Island of Hawaii almost two years ago. The HD200 just broke 7000 miles. The valves had never been checked, so today, with the help of a great youtube on doing just that on an HD200. It's a single cylinder water cooled 172 cc engine with a ceramic coated cylinder. With removing and reinstalling the body parts and being my first time doing this, it took about an hour and a half. The valves were still at perfect clearances, and I didn't have to reset any of the two intake and two exhaust valves. I knew they would be close, as when I removed the valve covers and rotated to TDC on compression stroke, I could feel a little play in each one. The bike has got a bit hard starting when cold, and I was worried that the valves were too tight, but no such problem. It runs great warm. Maybe the auto choke is acting up. I'm still learning about scooters. I've ridden motorcycle since I was eight, and I'll be sixty on Nov. 1st.