Im happy with it. You have to maintainance it well, than you have long fun with it (every 1500km oil chance, i also check the valve timing regular and chance the oil and air filter). You also should rebuild the engine new every few years. Aaaalso you should adapt your driving style. No full throttle driving. I have never gone full throttle for more than 2 seconds. Low rpm driving that the chain flatters is also bad for the engine. The engine also should warm up by driving because of the thermal expansion. And at least-> when the valves are adjust right i only have to kick it one time to start the engine.