Bike rentals from HCMC/Bien Hoa

i am looking for a rental bike. minimum 150 -250 CC for my traveling in Vietnam during tet 2015 holidays?

suggestions?

expected cost ?
Risks Involved etc ?
i am expat here for 2.5 years. wanted to cover 7 days journey from south to middle vietnam and return back.,...

thanks

Please contact to me

Can i join the tour

Hey buddy when you find out the price for bike between 150cc and up let me know thanks, as i be heading to Vietnam during tet aswell,