Welcome to the madness. Joseph's description covers everything we can see in your single photo, add to that the early period correct Goodyear Rawhides. More pic's with rear fender and tank removed will show more. Someone built a nice project bike back in the day.
"HJ"
84 YT60
85 350x (423cc) with 81 XL500 head conversion
83 XR500 (628cc) converted 3 Wheel hybrid
73 CB750 K3 converted 3 Wheel hybrid
86 TRX250R chassis XR650L engine hybrid
89 TRX250R (stock )
90 LT500 Quadzilla
85 FL350 Odysses ( water cooled head )
Lost (sold) but not forgotten 80 ATC 110 (205cc on alcohol ) 83 200x ( 222cc ) 83 200x ( 185s eng ) 85 350x ( stock )
added to the collection recently, (2) '70 US90 Aquarius Blue and '74 ATC90 Daytona Orange