Riding this past weekend and the last couple miles the grizzly 660 started misfiring. Also noticed the reverse light lighting up same time. Never quit but just slowed down. After poking around on this forum looking up the symptoms I was experiencing it dawned on me it did sound like it was hitting a rev limiter. So I found out how to do the reverse rev limiter mod and made the wiring change. I will test it out soon as I can to confirm the fix and report back here.