For whatever it's worth, my intent is to not touch the valves unless I'm really bored in the middle of the winter and have nothing better to do. I have been kinda religious in the past with some of my other bikes to check the valve clearance as recommended. IMO, this is a big hassle with zero rewards. Even when a valve needs a small adjustment (almost never happens), it doesn't make any difference in the real world in terms of perfomance etc... What my scooter needs is gas, oil, tires and brake pads when required. Adjusting valves every 2.5k miles is way out of line.