I will be in Cambodia from the 18th of March to 19th of April. (I'll also be in nothern Thailand from the 7th of March)
Between the 18th and 31st of March I'll be doing PP -> Kampong Thom, Sambor Kik, Preak Khan, Route 66, Beng Melea, Koh Ker, Tbeng Meancey, Preah Vihear and Siem Reap.
I'll send you a PM, and see if we can tee something up.
I assume you're talking about dirt bike rather than road?