Tim, send me a private message with your email address. The two older HRCs are in a batch that may have an issue with the Roto-Stop lever disengaging, either due to a a misalignment, or defective handlebar. I'll send you the inspection procedure, and it will explain how to check if it a simple mechanical adjustment or if the handlebar needs replacement. I'll also send you the detailed bulletin on all HST inspection, adjustments, etc.