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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Magneto
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<blockquote data-quote="Phil Mahood" data-source="post: 4555" data-attributes="member: 71"><p>It is surprising how often I see this. The cam ring itself is located by a pin in the back. It cannot be installed in the wrong position. However, the whole contact break end housing can be installed 180 degrees out. To rectify, just take out the two screws (one with points cap retainer post), spin it around and re-secure. The post should be to the front of the bike. Looking at the cam ring as the mag would be mounted on the bike, the first lobe (rear cylinder #1) should be at about 6 o'clock. Then there is a long gap to the next lobe at about 11 o'clock. The bike will not run properly, or at all, unless things are this way.</p><p></p><p>If the cam ring housing is out 180 degrees, it is possible to time it so that the rear cylinder will start. However, there is extreme fire danger. The other cylinder will fire when the inlet valve is open sending a flame out the front carb. Many a twin has been imolated this way! Beware.</p></blockquote><p></p>
[QUOTE="Phil Mahood, post: 4555, member: 71"] It is surprising how often I see this. The cam ring itself is located by a pin in the back. It cannot be installed in the wrong position. However, the whole contact break end housing can be installed 180 degrees out. To rectify, just take out the two screws (one with points cap retainer post), spin it around and re-secure. The post should be to the front of the bike. Looking at the cam ring as the mag would be mounted on the bike, the first lobe (rear cylinder #1) should be at about 6 o'clock. Then there is a long gap to the next lobe at about 11 o'clock. The bike will not run properly, or at all, unless things are this way. If the cam ring housing is out 180 degrees, it is possible to time it so that the rear cylinder will start. However, there is extreme fire danger. The other cylinder will fire when the inlet valve is open sending a flame out the front carb. Many a twin has been imolated this way! Beware. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Magneto
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