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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Equal lift at 4 degrees
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<blockquote data-quote="greg brillus" data-source="post: 85099" data-attributes="member: 597"><p>In the absence of dial indicators and/or if your bike is in an assembled state with the upper frame in place, you can do the following....... One at a time, set up each lobe, follower, pushrod and adjuster and just lightly nip up the adjuster so you can still rotate the cam on its own. Spin the cam so that.......with the cam just opening the inlet valve, you mark the cam pinion against a corresponding mark on the crank case immediately above the pinion gear. Then do the same but with the cam rotated the other way so that you create another mark with the exhaust valve just closing (Just rotate the cam backward until you feel it trying to lift the exhaust valve) and again put a mark on the crankcase. If you split these two marks, then you will have the cam positioned at about equal lift. I know some will say that some cams have quietening ramps an so on, but it will still work pretty close to the mark. I've done this before and it worked fine. Cheers.........Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 85099, member: 597"] In the absence of dial indicators and/or if your bike is in an assembled state with the upper frame in place, you can do the following....... One at a time, set up each lobe, follower, pushrod and adjuster and just lightly nip up the adjuster so you can still rotate the cam on its own. Spin the cam so that.......with the cam just opening the inlet valve, you mark the cam pinion against a corresponding mark on the crank case immediately above the pinion gear. Then do the same but with the cam rotated the other way so that you create another mark with the exhaust valve just closing (Just rotate the cam backward until you feel it trying to lift the exhaust valve) and again put a mark on the crankcase. If you split these two marks, then you will have the cam positioned at about equal lift. I know some will say that some cams have quietening ramps an so on, but it will still work pretty close to the mark. I've done this before and it worked fine. Cheers.........Greg. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Equal lift at 4 degrees
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