I change lifters every 5,000 to 7,000 miles on both my 110 and 120r motors "no matter what". More than once, I've found a lifter starting to fail, a couple of times failure was imminent. I am very sure had I not changed lifters on a schedule akin to changing oil, that I would have had a failure such as pictured. The majority of my riding on my SEUC is trips west that are of duration of 4,000 to 7,000 miles. Mostly riding in the Rocky Mountains, two up, pulling a Bushtec. I admit this type of riding is hard on motors. Extended periods of riding at high engine temperature. Pulling to 10/12,000 feet regularly, sometime a few times each day. But never abusive riding. Actually, as gentle as possible riding, considering the terrain. I always leave home with new oil, filter and lifters. Sad state of affairs, but I'd prefer this type preventative maintenance vs. a failure thousands of miles from home. Almost as frustrating as the four compensators I've needed to reach 30,000 miles...