Most within the industry know that Honda was late to the party when it came to the dual overhead cam (DOHC) engine. The other Japanese brands had produced them for a few years already when Honda introduced its version in 1979 in the CBX and CB750. But there seems to have been a communication glitch, or maybe just poor customer service at some Honda dealerships. While a customer advocate at American Honda, the corporate headquarters, for a while there I received a number of envelopes addressed to the company and containing valve shims, accompanied by letters assuming a warranty defect and demanding reimbursement for their bikes needing "shimming" during its 600-mile service! We can laugh at this today, in an age when even off-road bikes use valve pads or shims for clearance adjustment. Picture it, a pile of 25mm diameter valve shims falling out of an envelope onto my desk. But these customers were sincere and felt taken advantage of. True story.