Alright sorry folks. I was away from the computer and didn't tend to my response properly. I will try and respond to all the questions.
Video of two of my "vintage" bikes in action. 78 DT250 (mono) and 73 F11M (250cc)
Vintage motocross riding - YouTube
JDgreen227: White bike= 69 H1 (500) not possible to be a 77 H1 as 75 was the last model year. It is awaiting restoration. Here is a 1969 black H1 that I have about 80% restored (the 20% is the body work all mechanicals are new and it is rideable)
Here is a 1974 example of the H1 (finally got a disc brake in front and CDI ignition to get ride of timing 3 sets of breaker points)
1968 Kawasaki A7SS (350 rotary valve twin) all original bought new by my dad
CarDoc: I have 3 DT's 81 DT100, 72 DT 175 and a 78 DT250 (mono shock) none of which pictured (not enough time to take all the pics I wanted that day)
No YZ's unfortunately but a pre YZ and a runner up to the widowmaker (Suzuki's TM400 "Cyclone") 1974 SC500 4 speeds of wildly erratic power
Same bike in 1978 up on top of Webster pass (12,000 feet) that is my mom and her 1967 Yamaha YCS1 (90cc)
1974 Yamaha TY250 I compete in the twin shock observed trials class
My first "modern" trials bikes 97 Gas Gas JTX270
My current "modern" trials bike 2002 Gas Gas TXT321 (I built a rack so I could haul it on my car since the bike only weighs 150lbs)
One of my hand built pit bike racers (yes it is in my kitchen)
Oh yeah did I mention that our family collects Pontiac Fiero's? Have one for every year of production and every engine/transmission combo and trim level.
Here is about the 6th or 7th we have restored/modified up on the lift for restoration.