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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Timing
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<blockquote data-quote="oexing" data-source="post: 168339" data-attributes="member: 1493"><p>Is it an effect of the hunting gear method ? Turn your engine a few revolutions and watch marks if they still align at all. I was thinking you have to set up all dots and lines on ALL gears as a first action and not turn the engine in between as the hunting tooth design only ligns up at the start. You´d have to do a lot of turns till all marks lign up again. </p><p> My thinking was to have marked cam gears and corresponding marks on the engine case at suitable places set at equal lift according to clocks placed on valve spring cups . So then you can replace half time gears and large idler which will not have marks at all when new. </p><p> Anyway, when you got marks like in my photos you just have to find TDC at overlap resp. 4 degrees BTDC , lign up the cam mark with case mark and engage the half time gear in best position, testing all 5 slots in it. When turning the crank 360 degrees plus 50 for V-twin the front cam marks should lign up with marks you did before at equal lift for front cam. </p><p> Certainly your marks will be unsuitable when you change camshafts so then you do fresh marks on the new cam gear assembly.</p><p></p><p> Vic</p><p>[ATTACH=full]55963[/ATTACH]</p><p></p><p>[ATTACH=full]55964[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 168339, member: 1493"] Is it an effect of the hunting gear method ? Turn your engine a few revolutions and watch marks if they still align at all. I was thinking you have to set up all dots and lines on ALL gears as a first action and not turn the engine in between as the hunting tooth design only ligns up at the start. You´d have to do a lot of turns till all marks lign up again. My thinking was to have marked cam gears and corresponding marks on the engine case at suitable places set at equal lift according to clocks placed on valve spring cups . So then you can replace half time gears and large idler which will not have marks at all when new. Anyway, when you got marks like in my photos you just have to find TDC at overlap resp. 4 degrees BTDC , lign up the cam mark with case mark and engage the half time gear in best position, testing all 5 slots in it. When turning the crank 360 degrees plus 50 for V-twin the front cam marks should lign up with marks you did before at equal lift for front cam. Certainly your marks will be unsuitable when you change camshafts so then you do fresh marks on the new cam gear assembly. Vic [ATTACH type="full"]55963[/ATTACH] [ATTACH type="full"]55964[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Timing
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