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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
BTH magnetos
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<blockquote data-quote="BigEd" data-source="post: 12230" data-attributes="member: 161"><p><strong>BT-H Magnetos</strong></p><p></p><p>The body shape of the BT-H flange fitting magneto enables it to fit on many different makes of bikes. Removing the rear fixing stud and substituting a socket head cap screw was the simplest and most economical way of making it compatible with a Vincent twin. </p><p>The need to relieve the casting/magneto body seems to be very random and is not usually a problem. The different thickness of crankcase casting I assume is due to variations you often get with sand castings. The weight of my '48 cases suggests there is certainly plenty of metal and the BT-H magneto went straight on. A "dry" fit first to check clearance after removing the old magneto is a good idea.</p><p>A fixed timing pinion (ET48), steel pinion boss (ET223/1), self extracting nut (E54), plus four fixing screws, nuts and washers are required. I got this kit from the VOC Spares Company. If you want to avoid buying more parts you can use an existing mechanical advance/retard pinion with the mechanism "fixed" by welding. [People who have had trouble with mechanical adv/ret mechanisms might suggest blowing up rather than welding up. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> ]</p><p>You can see some fitting instructions online at the link below. There are also links to photographs and fitting comments supplied by customers.</p><p></p><p><a href="http://www.bt-h.biz/vincent_fitting.htm" target="_blank">http://www.bt-h.biz/vincent_fitting.htm</a></p><p></p><p>Eddy</p></blockquote><p></p>
[QUOTE="BigEd, post: 12230, member: 161"] [b]BT-H Magnetos[/b] The body shape of the BT-H flange fitting magneto enables it to fit on many different makes of bikes. Removing the rear fixing stud and substituting a socket head cap screw was the simplest and most economical way of making it compatible with a Vincent twin. The need to relieve the casting/magneto body seems to be very random and is not usually a problem. The different thickness of crankcase casting I assume is due to variations you often get with sand castings. The weight of my '48 cases suggests there is certainly plenty of metal and the BT-H magneto went straight on. A "dry" fit first to check clearance after removing the old magneto is a good idea. A fixed timing pinion (ET48), steel pinion boss (ET223/1), self extracting nut (E54), plus four fixing screws, nuts and washers are required. I got this kit from the VOC Spares Company. If you want to avoid buying more parts you can use an existing mechanical advance/retard pinion with the mechanism "fixed" by welding. [People who have had trouble with mechanical adv/ret mechanisms might suggest blowing up rather than welding up. :) ] You can see some fitting instructions online at the link below. There are also links to photographs and fitting comments supplied by customers. [url]http://www.bt-h.biz/vincent_fitting.htm[/url] Eddy [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
BTH magnetos
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