I reckon it's a '78... try downloading the parts book in .pdf and look at the cover and other unique parts. I think Suzuki only started making OB's in 1978. I have a DT-6 and the parts book came in handy for locating parts and where they go.My login is andrewkafp passw ak123456<br /> http://www.brownspoint.biz/fiche/dt65.asp