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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Advice on SEVERE tank slap
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<blockquote data-quote="mach1ne" data-source="post: 303" data-attributes="member: 259"><p>Hello everyone,</p><p>Can anyone give me their thoughts on the cause of tank slap on a 1951 series C Black Shadow. The bike has freshly refurbished Vincent shock absorbers, the wheel bearings are OK, the headstock bearings feel tight and smooth and when lifted off the ground , the Girdraulic forks have no perceptible play. It has a 19" front wheel with a new ribbed front tyre running at 25 PSI.</p><p>I'm only fairly new to this bike , but have covered about 1500 Km, without any other signs of major headshake. A couple of weeks ago, on a club run, it had a head shake that was that severe that it shattered both my wrists and threw me onto the opposite side of the road. My wife , who was following me , said I did'nt go up in the air , just straight sideways off the bike. The road was smooth and dry tar with an old road repair perpendicular to it, which had subsided slightly and had a small bump a few feet prior to the repair. I was doing about 80 Kmh on trailing throttle in anticipation of an upcoming tee intersection. The steering damper was only just tightened enough for round town riding.</p><p>Any information would appreciated.</p><p><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite5" alt=":confused:" title="Confused :confused:" loading="lazy" data-shortname=":confused:" /></p><p>Thanks</p><p>Dean</p><p>Canberra </p><p>Australia</p></blockquote><p></p>
[QUOTE="mach1ne, post: 303, member: 259"] Hello everyone, Can anyone give me their thoughts on the cause of tank slap on a 1951 series C Black Shadow. The bike has freshly refurbished Vincent shock absorbers, the wheel bearings are OK, the headstock bearings feel tight and smooth and when lifted off the ground , the Girdraulic forks have no perceptible play. It has a 19" front wheel with a new ribbed front tyre running at 25 PSI. I'm only fairly new to this bike , but have covered about 1500 Km, without any other signs of major headshake. A couple of weeks ago, on a club run, it had a head shake that was that severe that it shattered both my wrists and threw me onto the opposite side of the road. My wife , who was following me , said I did'nt go up in the air , just straight sideways off the bike. The road was smooth and dry tar with an old road repair perpendicular to it, which had subsided slightly and had a small bump a few feet prior to the repair. I was doing about 80 Kmh on trailing throttle in anticipation of an upcoming tee intersection. The steering damper was only just tightened enough for round town riding. Any information would appreciated. :confused: Thanks Dean Canberra Australia [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Advice on SEVERE tank slap
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