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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Checking the Cam timing on a twin
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<blockquote data-quote="ernie" data-source="post: 179630" data-attributes="member: 63"><p>Quick test. With rear cylinder on the exhaust stroke. Crank 4 degs BTDC. Notice that the slot in the rear cam end points straight up the centre of the cylinder. The slot in the front cam end points vertically down. Ignore the dots. Watch the slots.</p><p></p><p>The slots are accurate because they are used in the setting of the cams in the pinions.</p><p></p><p>PS- in this setup is a good chance of checking ignition timing. One complete rotation of the crank and the rear piston is on the firing stroke, the slot pointing at the crank. In this position, the mag points or whatever, fully retarded, should be about to open.</p><p>[ATTACH=full]62245[/ATTACH]</p></blockquote><p></p>
[QUOTE="ernie, post: 179630, member: 63"] Quick test. With rear cylinder on the exhaust stroke. Crank 4 degs BTDC. Notice that the slot in the rear cam end points straight up the centre of the cylinder. The slot in the front cam end points vertically down. Ignore the dots. Watch the slots. The slots are accurate because they are used in the setting of the cams in the pinions. PS- in this setup is a good chance of checking ignition timing. One complete rotation of the crank and the rear piston is on the firing stroke, the slot pointing at the crank. In this position, the mag points or whatever, fully retarded, should be about to open. [ATTACH type="full" alt="1714515687087.jpeg"]62245[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Checking the Cam timing on a twin
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