Ryanh

Ok so I have a 1977 Yamaha Dt 400... I'm looking to buy a manual for it, I found one but it says on the cover that it's for a Dt 400 (d) and I have been led to believe that mine is a Dt 400 mx?? The book still seems to be based on the 400cc engine and the monoshock... Question is will it work?? This is my frame incase anyone can tell what it is from the photo This is the cover of the manual