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Them were the days
« on: 18 May, 2019, 05:06:30 PM »
Old Dunlop Technical vid from the 70's

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Offline gavuk

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Re: Them were the days
« Reply #1 on: 18 May, 2019, 05:51:00 PM »
I'm more disturbed by the comb-over than the weave....

Great video.

Offline Tigermike

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Re: Them were the days
« Reply #2 on: 18 May, 2019, 05:52:07 PM »
 :005: did the riders of the 70's really experience high speed wobble & weave?
that would put most riders off ever riding again, wouldnt it?  :087:
Yam RD125 DX, Kwak GPZ305, Honda CB400T, 1983 Kwak GT550, Suzuki GSF650 Bandit, Tiger 1050SE .... got there in the end.

Offline Yellow Dog

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Re: Them were the days
« Reply #3 on: 18 May, 2019, 07:09:14 PM »
Not sure I remember such a wobble. Perhaps I never rode fast enough  :033:
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Offline sax_000

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Re: Them were the days
« Reply #4 on: 18 May, 2019, 11:34:19 PM »
Interesting...........
I started riding in the late 60's but only rode middleweight bikes up till the late 70's so I don't remember the 'high speed weave'.  But I do remember the 'low speed wobble' and I always cured it by replacing the front tyre with better quality rubber, usually Michelin.
The other point that comes to mind is that, at the time of this film, the motorcycle manufacturers were only just starting to come to grips with the power output of these new big bikes and frame & suspension technology hadn't caught-up yet.  I can vividly remember Ross King on the Kawasaki 500 H1 Mach111 violently wobbling up the hill at Amaroo Park at the Castrol 6-Hour Production race and eventually hitting the rock wall on the outside of the bend and being severely injured.  In those days the front forks had no real bracing other than the flimsy front mudguard and I noticed in the film that the forks were moving independently.  When I got my first 'big' bike, a Yamaha XS1100G, one of the first mods I made was to fit a clamp-on fork brace to improve the rigidity of the front-end.
Another interesting bit was the effect of rider weight and body position.  I've always been on the beefy side, so maybe that's why I never experienced the 'high speed weave', but if I had I doubt I would have thought to lie flat on the tank to resolve the situation.

Saxo

Offline Yellow Dog

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Re: Them were the days
« Reply #5 on: 19 May, 2019, 10:16:56 AM »
OK - So some horrible hidden memories are starting to reemerge of low speed (20-30mph) 'Tank Slapping'  :087:

Lots of braking or lots of power, usually fixed this, as did steering left or right. 
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