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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
New Carbs
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<blockquote data-quote="Monkeypants" data-source="post: 135940" data-attributes="member: 2708"><p>If you are aiming for Black Shadow performance then all you need are the 28 mm carbs. These are very close to 1 1/8" which is the Black Shadow size.</p><p>Internally the only thing needed is 7.3 to 1 compression , or 8 to 1 for US spec.</p><p>So there is not much in performance gap between a standard Rapide and a standard Black Shadow.</p><p>The Picador testing showed 48 bhp at crank for the Black Shadow vs 45 for Rapides tested on the same dyno.</p><p>3 bhp seems about right for a bit of compression and a bit of carb. The 55 bhp number for the Shadow is perhaps a " Brochure horsepower" number, to borrow a phrase from Phil Irving.</p><p>If your bike has stock ports then it would likely be quicker with 28 mm carbs rather than 32 mm.</p><p></p><p>Glen</p></blockquote><p></p>
[QUOTE="Monkeypants, post: 135940, member: 2708"] If you are aiming for Black Shadow performance then all you need are the 28 mm carbs. These are very close to 1 1/8" which is the Black Shadow size. Internally the only thing needed is 7.3 to 1 compression , or 8 to 1 for US spec. So there is not much in performance gap between a standard Rapide and a standard Black Shadow. The Picador testing showed 48 bhp at crank for the Black Shadow vs 45 for Rapides tested on the same dyno. 3 bhp seems about right for a bit of compression and a bit of carb. The 55 bhp number for the Shadow is perhaps a " Brochure horsepower" number, to borrow a phrase from Phil Irving. If your bike has stock ports then it would likely be quicker with 28 mm carbs rather than 32 mm. Glen [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
New Carbs
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