Could GraeagleRincon's problem be a low oil level issue?? If the o-rings are ok, but the wrong type of Honda oil was used, and/or the level is quite a bit low I could see where this type of transmission would slip in that manner.
My Rincon will be 1yr old on Sept 1. 1150 miles to date. Out of all these miles, my transmission has acted up maybe 2-3 times for a very brief period. I mean no longer than 5 seconds. The transmission problem I encountered has always happened while trying to move from a stand still. Even after the bike had been in use for an hour or more. You would shift into drive and nothing..? No noise of any kind, just nothing. Shift into reverse and it seemed fine, back into drive and all was well. (yes the shifter was all the way forward in drive, double checked each time this happened)
Similar to what Buckeye Rincon stated, I only let my bike warm up for 1 minute or so in the warm weather and 2 to 3 minutes in the sub-freezing weather. I never take right off wide open though. Usually run at a moderate rate through the gears first, then ride how ever I want.
I have only used Honda 4-Stroke GN4/10W40 SJ oil. It has been 6 months or more since it last happened. I don't see this a being a big issue on my bike as the transmission has worked perfectly 99% of the time. ( based on 3 issues out of the roughly 1000 times the transmission has been shifted into drive in a 1 yr period )
Any one else experience this type of transmission slipping or just not working at all issue?