Ok so I was able to dig out my copy of this build. Unfortunately I only have the first issue and it does not cover the whole build. This is what it has.
The stock bike. Stock 1971 Yamaha DT1MX total weight 246 lbs.
The cylinder is from the GYT kit and weighs 2lbs less than the stock cylinder.
The cylinder head is a Don Jones high comp head with twin plugs for the dual spark ignition.
The ignition is specially machined Kawasaki rotor, magneto, and stator plate.
The carb 34mm Mikuni road racing unit.
The triple tree is Don Jones 5 way adjustable for Yamahas. Only weighs 5 3/4 lbs.
The frame is a Champion MX chromoly and only weighs 17lbs.
The forks are stock 1971 Yamaha forks with 12 ounces shaved off by turning in a lathe 13lbs. Ceriani forks would have been 22lbs.
The front wheel is a stock AT1 hub 3 3/4lbs. The rear is a magnesium Rickman 5 3/4lbs. The rims are Baroni and the tires are dunlop 16lbs. All tied together with stainless steel spokes.
Unfortunately this is all I have, I need to get the Nov. 1971 issue. For some reason I believe there was also a third issue that finalized everything.