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<blockquote data-quote="timetraveller" data-source="post: 147990" data-attributes="member: 456"><p>Kid, the early Black Shadows had a high first gear. It sounds like you have one of those. As for rear sprockets to reduce the gearing; there are, or should be, a wide range available, 46, 48, 50, 52, 54 and so on up to 60. It depends upon how well you are able to control your twist grip hand as to what will be best. Your weight, the weight of the sidecar and any passenger to be carried in it all come into it. You don't want to rev or slog the engine. It might help to know that the engine revs at 100 mph are the same as the number of teeth on the rear sprocket times 100, i.e. 5,000 rpm with 50 tooth rear sprocket. I think that a 56 or 58 would give you the speed you might want with useful acceleration. Just don't rev it to bits without more experience of the engine.</p><p>The rev counter being jerky could be the drive cable need greasing, an easy do it yourself job, or it needs a sevice of the internal workings of the head, not for the faint hearted.</p><p>Just watch out for those old tyres. The can just split with no warning and if it is the front one you will loose control.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 147990, member: 456"] Kid, the early Black Shadows had a high first gear. It sounds like you have one of those. As for rear sprockets to reduce the gearing; there are, or should be, a wide range available, 46, 48, 50, 52, 54 and so on up to 60. It depends upon how well you are able to control your twist grip hand as to what will be best. Your weight, the weight of the sidecar and any passenger to be carried in it all come into it. You don't want to rev or slog the engine. It might help to know that the engine revs at 100 mph are the same as the number of teeth on the rear sprocket times 100, i.e. 5,000 rpm with 50 tooth rear sprocket. I think that a 56 or 58 would give you the speed you might want with useful acceleration. Just don't rev it to bits without more experience of the engine. The rev counter being jerky could be the drive cable need greasing, an easy do it yourself job, or it needs a sevice of the internal workings of the head, not for the faint hearted. Just watch out for those old tyres. The can just split with no warning and if it is the front one you will loose control. [/QUOTE]
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