Hi hoping for some help here. I'm in Canada, and going through the registration process. Bike has never been registered, was a farm bike, bill of sale only. My inspector told me I need to send the insurance company proof of "Dual Purpose" Street Legal Factory Info. to get it street legal. Preferably In the form of a manual, advert, or anything printed from Yamaha stating it was designed and equipped to be ridden on or off road. Apparently they do not recognize the "Enduro" description either. Needs to say Dual Purpose, or some writing has to actually say Street Legal or made for rod use. I've combed through the owner's manual, no luck.

Anybody have thoughts on this? Appreciate any and all help.

The "Forward" page of the 1971 DT1E Service Manual in the Tech Library says

"The DT1 was Yamaha's first fully street legal motorcycle designed to enable the owner to ride on the street, use for trail or enduro riding or convert (with factory available parts) into a competition-ready scrambler or motocrosser"

Super helpful, appreciate this Mark!

I don't know what you have for an owner's manual but the one in the Tech Library might be helpful as it covers both the DT1E and DT1MX.  It's pretty obvious there were two models, one for street/trail use and the back of the manual covers the "off-road only" model.  Several places the text references road and trail use. 

At the very back of the owner's manual is the USA-mandated for highway vehicles braking and passing performance.  That only makes sense for a street legal vehicle so just that should be proof enough?

Final thought is bike would have had a decal on the steering head certifying it as a road-legal vehicle.

If yours is missing, DEET makes replacements.  You should contact him. 

Mark, thanks again. I think you provided just wha I needed...See attachment of my VIN stickers...