So the moral of the story is put on a stone and you will be OK
I've go a couple of stone in reserve then. Should be O.K. for 130mph
My KH500 would wobble like that at 85. I was 18 and 9 stone then so they've probably got a point. I did once see north of 115mph on the speedo so I must have had a big dinner that day
I have to say they are both braver than me. I would never let it wobble like that and carry on riding.
I had my fair share of wobbly bikes from Yamaha Honda 70's, Yam AS3's, RD200, 400Four and the KH. That all ended when I bought a brand new 350LC. It would go around corners at speeds I couldn't do in a straight line on some of the previous bikes. Although in later years my GSXR1100H would be on the verge of a tank slapper on some fast sweepers though and 125 on the Autobahn in a straight line while fully loaded was the absolute limit for stability.
The R1 is very stable. The only time it gets a bit crossed up is when the front wheels not on the ground which doesn't take much. That and when it's got a ton of luggage and the Mrs. on it. Bikes have come on a long way.
A mate graduated from an LC to a YPVS for the 1985 season. He rang Stan Stephens to ask him some technical questions about the tuning and he asked him some advice about the handling, specifically it wobbling on the straights. Stan said he needed to adjust his bottle. When my mate asked what bottle Stan said "no, you need to adjust YOUR bottle" in other words man up and hang on!
Watch the film of Terry Rymer, Dean Askins and Kevin Maudsley at the Marlborough finals at Silverstone 1985 for some examples of YPVS wobbles.