You not going to believe this but.........yes there's more to this saga! If you have nothing better to do in your life go to HUGHES BULTACO website. In there you will find a video called "How we got started" which details the Hugh Weaver story (quite interesting I might add) Anyway about 3/4 of the way through the tale up pops JP with a little gem. If it's true we have found the frame used in the 1973 GP and JC has already posted a photo of it! Off you go JC, Firko. I'm loving this Jerry
Hec Jerry, you don't need us! Well done again. The serial # on that frame certainly fits right in w the other factory prototype 400 Buls of late 72/early 73.
I've looked looong & hard many times over the last couple of weeks at the rear frame loop on JPs bike in the pic of the start of the Spanish GP on p26 of VMX3. It doesn't look like a std pursang rear loop. It looks longer w a sharper upward bend, just like the works frame # B1000248 that I posted. To some degree you can compare it to the other Pursangs in the pic (#18, 23, 24 &39) but the detail in that pic is too indistinct to be conclusive.
Interesting that JP says in that clip that Hugh has 2 frames there. I'm sure I've seen a pic of 2-3 frames at Hughs, said to be JPs factory frames (I think one was a bit bent or something) but I can't find it anywhere.
And here's another quote that could be relevant (from VMX #16, p12). It concerns the frame of one of JPs 76 GP bikes, but the same could well be true of the 73 frame:
"According ton 'El Rubio', the mat'l they used was aircraft tubing & was obtained thro a friend who worked at the Belgian airline Sabena... The finish & welding are of much better quality than usual cos they wer made in Bultaco's 'special series' department by Mr Cespedes, the head of the sheet metal workshop."