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'''V''' - [[poppet valve|Valve]]s<br> '''6''' - Eccentric valve motion<br>

...ls - initially all two-strokes, including from 1953 onwards a 200cc rotary-valve twin bearing the curious name of the B200 Spring Lasting (don't ask!). This The [[carburettor]] slide and cable on this brand new bike were still very sticky meaning that in the