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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Setting MkII Cams With No Timing Marks...Equal Setting?
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<blockquote data-quote="oexing" data-source="post: 170891" data-attributes="member: 1493"><p>Forget all these funny numbers, they are not relevant for the performance of the engine. The critical point is the timing around overlap. So you set valve clearance at nil on the base circle and put two clocks on valve spring caps. Then turn each cam to overlap position and equal lift. Easiest way is to have extra light springs fitted for easy turning the cam by fingers. I then mark the engine case and cam gear tooth at suitable places for that equal-lift-position. So you have two marks on engine case for front and rear cam, plus two marks on gears of front and rear camshaft. </p><p> So then have a degree wheel on the crank with zero at TDC , checked by piston stop method, meaning an old spark plug gutted for a length of bolt in it. </p><p> So you turn the crank at 4 degrees BTDC and the rear cam for equal lift with your marks on gear and case aligned. In this position slip the half time gear on the crank end after trying all slots for best fit. </p><p> The front cam timing will be next when you turn the crank one turn plus 50-4 degrees as the front cylinder is 50 plus from first pot. In this position at 4 degrees less from front TDC the front cam should align with your marks for front equal lift. But then it depends on the pressed on gear and large idler for getting a good match for your marks. So sometimes you´d have to press out the front gear and reposition for best fit possibly.</p><p> Any funny numbers from handbooks are useless as they were only correct with all new components at best, but I don´t believe this at all, too many variations in production in real life. </p><p></p><p> Vic</p><p>[ATTACH=full]58891[/ATTACH]</p><p></p><p>[ATTACH=full]58892[/ATTACH][ATTACH=full]58893[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 170891, member: 1493"] Forget all these funny numbers, they are not relevant for the performance of the engine. The critical point is the timing around overlap. So you set valve clearance at nil on the base circle and put two clocks on valve spring caps. Then turn each cam to overlap position and equal lift. Easiest way is to have extra light springs fitted for easy turning the cam by fingers. I then mark the engine case and cam gear tooth at suitable places for that equal-lift-position. So you have two marks on engine case for front and rear cam, plus two marks on gears of front and rear camshaft. So then have a degree wheel on the crank with zero at TDC , checked by piston stop method, meaning an old spark plug gutted for a length of bolt in it. So you turn the crank at 4 degrees BTDC and the rear cam for equal lift with your marks on gear and case aligned. In this position slip the half time gear on the crank end after trying all slots for best fit. The front cam timing will be next when you turn the crank one turn plus 50-4 degrees as the front cylinder is 50 plus from first pot. In this position at 4 degrees less from front TDC the front cam should align with your marks for front equal lift. But then it depends on the pressed on gear and large idler for getting a good match for your marks. So sometimes you´d have to press out the front gear and reposition for best fit possibly. Any funny numbers from handbooks are useless as they were only correct with all new components at best, but I don´t believe this at all, too many variations in production in real life. Vic [ATTACH type="full"]58891[/ATTACH] [ATTACH type="full"]58892[/ATTACH][ATTACH type="full"]58893[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Setting MkII Cams With No Timing Marks...Equal Setting?
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